Crown I-Tech I-T5000 HD User manual

Operation Manual
Obtaining Other Language Versions: To obtain information in another language about the use of this product, please contact your
local Crown Distributor. If you need assistance locating your local distributor, please contact Crown at 574-294-8000.
This manual does not include all of the details of design, production, or variations of the equipment. Nor does it cover every possible
situation which may arise during installation, operation or maintenance.
The information provided in this manual was deemed accurate as of the publication date. However, updates to this information may have
occurred. To obtain the latest version of this manual, please visit the Crown website at www.crownaudio.com.
Trademark Notice: Crown, Crown Audio, IQ, BCA, and Amcron are registered trademarks of Crown International. HiQnet is a trademark
of Harman International Industries, Inc. Other trademarks are the property of their respective owners.
Some models may be exported under the name Amcron.®
©2008 by Crown Audio®Inc., 1718 W. Mishawaka Rd., Elkhart, Indiana 46517-9439 U.S.A. Telephone: [phone]
I-Tech HD Series
140811-1
12/08
I-T5000 HD
I-T9000 HD
I-T12000 HD
PRELIMINARY

Operation Manual
I-Tech HD Series PowerAmplifiers
page 2
The I-Tech Series amplifiers are certified only
at 120V in Canada.
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with a dry cloth.
7. Do not block any ventilation openings. Install in accordance
with the manufacturer’s instructions.
8. Do not install near any heat sources such as radiators, heat
registers, stoves, or other apparatus (including amplifiers)
that produce heat.
9. Do not defeat the safety purpose of the polarized or
grounding-type plug. A polarized plug has two blades with
one wider than the other. A grounding-type plug has two
blades and a third grounding prong. The wide blade or
the third prong is provided for your safety. If the provided
plug does not fit into your outlet, consult an electrician for
replacement of the obsolete outlet.
Important Safety Instructions
MAGNETIC FIELD
CAUTION! Do not locate sensitive high-gain equipment such as pre-
amplifiers directly above or below the unit. Because this amplifier has a
high power density, it has a strong magnetic field which can induce hum
into unshielded devices that are located nearby. The field is strongest
just above and below the unit.
If an equipment rack is used, we recommend locating the amplifiers)
in the bottom of the rack and the preamplifier or other sensitive equip-
ment at the top.
The lightning bolt triangle is used to alert the user to the risk of
electric shock.
The exclamation point triangle is used to alert the user to
important operating or maintenance instructions.
REGARDEZ CES SYMBOLES:
La triangle avec le sigle ‘’foudre’’ est employée pour alerter
l’utilisateur au risque de décharge électrique. Le triangle avec
un point d’exclamation est employée pour alerter l’utilisateur
d’instruction importantes pour lors opérations de maintenance.
ATENCION CON ESTOS SÍMBOLOS:
El triángulo con el símbolo de rayo eléctrico es usado para
alertar al usuario de el riesgo de un choque eléctrico.
El triángulo con el signo de admiración es usado para alertar
al usuario de instrucciones importantes de operación o man-
tenimiento.
WATCH FOR THESE SYMBOLS:
IMPORTANT
I-Tech Series amplifiers require Class 2 output wiring.
Les amplificateurs de série de I-Tech exigent des câbles de sortie de
classe 2.
I-Tech-Reihe-Verstärker verlangen Klasse die 2 Produktionsverdrah-
tung.
Los amplificadores de la Serie I-Tech requieren de un cableado de
salida Clase 2.
TO PREVENT ELECTRIC SHOCK DO NOT REMOVE TOP OR
BOTTOM COVERS. NO USER SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
À PRÉVENIR LE CHOC ÉLECTRIQUE N’ENLEVEZ PAS LES
COUVERCLES. IL N’Y A PAS DES PARTIES SERVICEABLE
À L’INTÉRIEUR. TOUS REPARATIONS DOIT ETRE FAIRE PAR
PERSONNEL QUALIFIÉ SEULMENT.
PARA PREVENIR UN CHOQUE ELÉCTRICO, NO RETIRE LAS
CUBIERTAS SUPERIOR O INFERIOR. NO EXISTEN PARTES QUE
PUEDAN SER REPARADAS POR EL USUARIO AL INTERIOR.
REMITA EL SERVICICO AL PERSONAL TÉCHNICAL CALIFI-
CADO.
TO COMPLETELY DISCONNECT THIS EQUIPMENT FROM THE
AC MAINS, DISCONNECT THE POWER SUPPLY CORD PLUG
FROM THE AC RECEPTACLE. THE MAINS PLUG OF THE POWER
SUPPLY CORD SHALL REMAIN READILY OPERABLE.
POUR DÉMONTER COMPLÈTEMENT L’ÉQUIPEMENT DE
L’ALIMENTATION GÉNÉRALE, DÉMONTER LE CÂBLE D’ALI-
MENTATION DE SON RÉCEPTACLE. LA PRISE D’ALIMENTATION
RESTERA AISÉMENT FONCTIONNELLE.
PARA DESCONECTAR COMPLETAMENTE EL EQUIPO DEL
SUMINSTRO ELECTRICO, DESCONECTE EL CABLE DE ALI-
MENTACION DE LA TOMA DE CA. LAS PATAS DEL CONECTOR
DEL CABLE DE ALIMENTACIÓN DEBERAN MANTENERSE EN
BUEN ESTADO.
FCC COMPLIANCE NOTICE
This device complies with part 15 of the FCC rules. Operation is subject to the following
two conditions: (1) This device may not cause harmful interference, and (2) this device
must accept any interference received, including interference that may cause undesired
operation.
CAUTION: Changes or modifications not expressly approved by the party responsible for
complicance could void the user’s authority to operate the euqipment.
NOTE: This equipment has been tested and found to comply with the limits for a Class B
digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This equip-
ment generates, uses, and can radiate radio frequency energy and, if not installed and used
in accordance with the instruction manual, may cause harmful interference to radio com-
munications. However, there is no guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference to radio or television recep-
tion, which can be determined by turning the equipment off and on, the user is encouraged
to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
10. Protect the power cord from being walked on or pinched,
particularly at plugs, convenience receptacles, and the point
where they exit from the apparatus.
11. Only use attachments/accessories specified by the manufac-
turer.
12. Use only with a cart, stand, tripod, bracket, or table specified
by the manufacturer, or sold with the apparatus. When a
cart is used, use caution when moving the cart/apparatus
combination to avoid injury from tip-over.
13. Unplug this apparatus during lightning storms or when
unused for long periods of time.
14. Refer all servicing to qualified service personnel. Servicing
is required when the apparatus has been damaged in any
way, such as power-supply cord or plug is damaged, liquid
has been spilled or objects have fallen into the apparatus,
the apparatus has been exposed to rain or moisture, does
not operate normally, or has been dropped.
15. Use the mains plug to disconnect the apparatus from the
mains.
16. WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC
SHOCK, DO NOT EXPOSE THIS APPARATUS TO RAIN OR
MOISTURE.
17. DO NOT EXPOSE THIS EQUIPMENT TO DRIPPING OR
SPLASHING AND ENSURE THAT NO OBJECTS FILLED
WITH LIQUIDS, SUCH AS VASES, ARE PLACED ON THE
EQUIPMENT.
18. THE MAINS PLUG OF THE POWER SUPPLY CORD SHALL
REMAIN READILY OPERABLE.
Importantes Instructions de Sécurité
Wichtige Sicherheitsinstruktionen
Instrucciones de Seguridad Importantes

I-Tech HD Series PowerAmplifiers
Operation Manual page 3
DECLARATION of CONFORMITY
Crown International, Inc.
Sue Whitfield
574-294-8289
European Representative’s Name and Address:
David Budge
10 Harvest Close
Yateley GU46 6YS
United Kingdom
Equipment Type: Commercial Audio Power Amplifiers
Family Name: I-Tech HD
Model Names: I-T5000HD, I-T9000HD, I-T12000HD
EMC Standards:
EN 55103-1:1997 Electromagnetic Compatibility - Product Family Standard for Audio, Video, Audio-Visual and Entertainment Lighting Control Apparatus for Professional Use, Part 1: Emissions
EN 55103-1:1997 Magnetic Field Emissions-Annex A @ 10 cm and 20 cm
EN 61000-3-2:2005 and AMD1:2008 Limits for Harmonic Current Emissions (equipment input current less than or equal to 16 A per phase)
EN 61000-3-3:2008 Limitation of Voltage Fluctuations and Flicker in Low-Voltage Supply Systems Rated Current less than or equal to16A
EN 55022:2006 Limits and Methods of Measurement of Radio Disturbance Characteristics of ITE: Radiated, Class B Limits; Conducted, Class A
EN 55103-2:1997 Electromagnetic Compatibility - Product Family Standard for Audio, Video, Audio-Visual and Entertainment Lighting Control Apparatus for Professional Use, Part 2: Immunity
EN 61000-4-2:2001 Electrostatic Discharge Immunity (Environment E2-Criteria B, 4k V Contact, 8k V Air Discharge)
EN 61000-4-3:2006 Radiated, Radio-Frequency, Electromagnetic Immunity (Environment E2, criteria A)
EN 61000-4-4:2007 Electrical Fast Transient/Burst Immunity (Criteria B)
EN 61000-4-5:2006 Surge Immunity (Criteria B)
EN 61000-4-6:2006 Immunity to Conducted Disturbances Induced by Radio-Frequency Fields (Criteria A)
EN 61000-4-11:2004 Voltage Dips, Short Interruptions and Voltage Variation
Safety Standard:
IEC 60065: 2001 7th Ed. and AMD 1: 2005 Safety Requirements - Audio Video and Similar Electronic Apparatus
I certify that the product identified above conforms to the requirements of the EMC Council Directive 89/336/EEC as amended by 92/31/EEC, and the Low Voltage Directive 73/23/EES as amended by 93/68/EEC.
Signed
Title: Senior Vice President of Manufacturing
Date of Issue: November 1, 2008
ISSUED BY: Crown International, Inc.
1718 W. Mishawaka Road
Elkhart, Indiana 46517 U.S.A.
Due to line current harmonics, we recommend that you contact your supply authority before connection.
FOR COMPLIANCE QUESTIONS ONLY:

Operation Manual
I-Tech HD Series PowerAmplifiers
page 4
Important Safety Instructions ............................................................2
Declaration of Conformity..................................................................3
Table of Contents...............................................................................4
1 Welcome ........................................................5
1.1 Features .................................................................................5
1.2 How to Use This Manual .........................................................5
2 Setup .............................................................6
2.1 Unpack and Install Your Amplifier ..........................................6
2.2 Connecting to AC Mains ........................................................7
2.3 Wire Inputs and Outputs ......................................................... 7
3 Operation ........................................................11
3.1 Protecting Your Speakers........................................................11
3.2 Startup Procedure ..................................................................11
3.3 Precautions ............................................................................11
3.4 Front Panel Controls and Indicators .......................................12
3.5 Back Panel Controls, Indicators and Connectors .................... 13
4 Advanced Operation ............................................14
4.1 Advanced Operation Table of Contents....................................14
4.2 Navigating the LCD Control Screen.........................................15
4.3 Presets ...................................................................................23
4.4 File Transfer Via the USB Port..................................................24
4.5 List of Pop-Up Boxes and Descriptions...................................25
4.6 Digital Audio Options (AES/EBU)............................................26
4.7 Networking the Amplifier.........................................................26
4.8 Software-Controllable Onboard DSP .....................................26
5 Troubleshooting.................................................39
6 Specifications ...................................................41
7 AC Power Draw and Thermal Dissipation....................45
8 Advanced Features .............................................48
8.1 Protection Systems ................................................................ 48
8.2 Global, Switching Power Supply with PFC ............................. 48
8.3 3rd Generation Class I Circuitry .............................................. 48
8.4. Color-Coded Rear Overlay .................................................... 498
9 Appendix A: Network and CobraNet Basics..................49
Appendix B: Setting Sensitivity for Best Gain Staging......53
10 Service..........................................................54
11 Warranty........................................................55
Product Registration.......................................................................... 57
Crown Factory Service Information Form .......................................... 59
Table of Contents

I-Tech HD Series PowerAmplifiers
Operation Manual page 5
1 Welcome
The Crown®I-Tech HD Series offers amazing
power, light weight and ease of use for touring
sound applications. Unlike other amplifiers, it
includes onboard high-definition DSP, an LCD
control screen, and a built-in network
connection.
Modern power amplifiers are sophisticated
pieces of engineering capable of producing
extremely high power levels. They must be
treated with respect and correctly installed if
they are to provide the many years of reliable
service for which they were designed.
In addition, I-Tech Series amplifiers include a
number of features which require some
explanation before they can be used to their
maximum advantage.
Please take the time to study this manual so that
you can obtain the best possible service from
your amplifier.
1.1 Features
• Global Power Supply with PFC (Power Factor
Correction) works anywhere in the world.
• High power density, up to 8000 watts in a 2U
chassis.
• Highest output voltage in the industry (200V
peak) provides clean transient peaks.
• 3rd-generation patented Class I (BCA®)
circuitry couples power efficiently to the load
and provides low AC current draw.
• Onboard high-definition DSP with 24-bit,
192 kHz Cirrus Logic SHARC A/D and D/A
converters. Advanced IIR filters and linear-
phase FIR filters.
• Pushbutton presets simplify setup. Custom
presets for various loudspeakers can be
downloaded.
• AES/EBU digital audio input.
• EtherCon® Ethernet connector for HiQnet™
control or CobraNet digital audio transport.
This “Single Plug” connection allows HiQnet
protocol and CobraNet digital audio through the
same CAT 5 cable.
• Analog and digital thru connectors.
• LCD Control Screen is used to adjust the
amplifier’s attenuation and muting, configure
the amp, set up and view error monitoring, and
recall DSP presets to reconfigure the amp for
various applications.
• Comprehensive array of indicators provide
accurate diagnostics: Power, Data, along with
Ready, Signal, Clip, Thermal and Fault for each
channel.
• AC mains indicator in power switch glows
green when AC power is present.
• Front-panel USB connector accepts a USB
drive to transfer presets from the drive to the
amplifier DSP, and vice versa.
• Light weight due to aluminum chassis,
special internal construction and switching
power supply.
• Thermal management controller and two
discrete thermal zones with variable-speed fans,
forced-air cooling.
• Advanced protection circuitry guards against:
shorted outputs, DC, mismatched loads,
general overheating, under/over voltage, high-
frequency overloads and internal faults.
• Three-Year, No-Fault, Fully Transferable
Warranty completely protects your investment
and guarantees its specifications.
1.2 How to Use This Manual
This manual provides you with the necessary
information to safely and correctly setup and
operate your amplifier. It does not cover every
aspect of installation, setup or operation that
might occur under every condition. For
additional information, please consult the
online help in System Architect software,
Crown’s Amplifier Application Guide, I-Tech
Application Guide (available online at www.
crownaudio.com), Crown Technical Support,
your system installer or retailer.
We strongly recommend you read all
instructions, warnings and cautions contained
in this manual. Also, for your protection, please
send in your warranty registration card today.
And save your bill of sale — it’s your official
proof of purchase.
I-T5000HD
2-ohm Dual (per ch.)
4-ohm Dual (per ch.)
8-ohm Dual (per ch.)
4-ohm Bridge
8-ohm Bridge
20 Hz - 20 kHz
Power
20 Hz - 20 kHz Power refers to guaranteed
minimum power in watts with 0.35% THD.
4,000W
3,600W
1,800W
2,000W
1,250W
I-T12000HD
2-ohm Dual (per ch.)
4-ohm Dual (per ch.)
8-ohm Dual (per ch.)
4-ohm Bridge
8-ohm Bridge
20 Hz - 20 kHz
Power
20 Hz - 20 kHz Power refers to guaranteed
minimum power in watts with 0.35% THD.
8,000W
7,000W
3,500W
4,000W
2,100W
I-T9000HD
2-ohm Dual (per ch.)
4-ohm Dual (per ch.)
8-ohm Dual (per ch.)
4-ohm Bridge
8-ohm Bridge
20 Hz - 20 kHz
Power
20 Hz - 20 kHz Power refers to guaranteed
minimum power in watts with 0.35% THD.
6,000W
5,000W
2,500W
3,000W
1,500W

Operation Manual
I-Tech HD Series PowerAmplifiers
page 6
2.1 Unpack and Install Your
Amplifier
Please unpack and inspect your amplifier for
any damage that may have occurred during
transit. If damage is found, notify the
transportation company immediately. Only you
can initiate a claim for shipping damage. Crown
will be happy to help as needed. Save the
shipping carton as evidence of damage for the
shipper’s inspection.
We also recommend that you save all packing
materials so you will have them if you ever need
to transport the unit. Never ship the unit
without the factory pack.
YOU WILL NEED (not supplied):
Input wiring cables
Output wiring cables
Ethernet cables
• Rack for mounting amplifier (or a stable
surface for stacking)
WARNING: Before you start to set up
your amplifier, make sure you read and
observe the Important Safety Instruc-
tions found at the beginning of this
manual.
•
•
•
CAUTION: Before you begin, make sure
your amplifier is disconnected from the
power source, with the power switch in
the “off” position and all level controls
turned completely down (counterclock-
wise).
Use a standard 19-inch (48.3 cm)
equipment rack (EIA RS-310B). See
Figure 2.1 for amplifier dimensions.
You may also stack amps without using a
cabinet.
NOTE: When transporting, amplifiers should be
supported at both front and back.
When using an equipment rack, mount units
directly on top of each other. Close any open
spaces in rack with blank panels. DO NOT block
front or rear air vents. The side walls of the rack
should be a minimum of two inches (5.1 cm)
away from the amplifier sides, and the back of
the rack should be a minimum of four inches
(10.2 cm) from the amplifier back panel.
Figure 2.2 illustrates standard amplifier airflow.
2 Setup
Figure 2.2 Airflow
Figure 2.1
Dimensions
MAGNETIC FIELD
CAUTION! Do not locate sensitive high-gain
equipment such as preamplifiers or tape decks
directly above or below the unit. Because this
amplifier has a high power density, it has a
strong magnetic field which can induce hum
into unshielded devices that are located nearby.
The field is strongest on the right side and right
bottom of the amplifier (facing the amplifier).
If an equipment rack is used, we recommend
locating sensitive equipment at least 20 cm
(8 inches) away from the amplifier.
1.5 In.
3.8 cm
3.5 In.
8.9 cm
16.2 In.
41.1 cm
48.3 cm
19 In.

I-Tech HD Series PowerAmplifiers
Operation Manual page 7
2.2 Connecting to AC Mains
WARNING: The third (ground) prong of the supplied AC power
cord connector is a required safety feature. Do not attempt to
disable this ground connection by using an adapter or other
methods.
Amplifiers don’t create energy. The AC mains voltage and current must be
sufficient to deliver the power you expect. You must operate your amplifier
from an AC mains power source with not more than a 10% variation above
or a 15% variation below the amplifier’s specified line voltage range and
within the specified frequency requirements (indicated on the amplifier’s
back panel label). If you are unsure of the output voltage of your AC mains,
please consult your electrician.
Packed with your I-Tech amplifier is a clip that retains the power cord so it
can’t pull out accidentally.
1. Locate the clip in a bag in the I-Tech packing carton.
2. Locate the IEC power connector on the back of the amplifier. Above and
below that connector are two slots. Stretch the ends of the clip and insert
them into the slots (Figure 2.3).
3. Plug the power cord all the way into the amplifier IEC power connector.
4. Pull the clip to the left and snap it onto the power cord.
2.3 Wire Inputs and Outputs
2.3.1 Wiring basics
• Always use shielded wire for input wiring. The higher the density of the
shield (the outer conductor) the better. Spiral wrapped shield is not
recommended.
• When using unbalanced lines keep the cables as short as possible. Avoid
lengths greater than 10 feet (3 meters).
• Do not run the audio input cables together with the high-level wiring such
as loudspeaker wires or AC cords. (This lessens the chance of hum and
noise being induced into the input cables.)
• Turn the entire sound system off before changing any connections.
Crown is not liable for damage incurred when any transducer or component
is overdriven.
THE CHANNEL 2 INPUT IS IGNORED by default in Bridge Mono mode. It
can be summed using the input source selector and used instead of
Channel 1.
For additional information on audio input wiring please refer to the Crown
Amplifier Application Guide available online at www.crownaudio.com. It
contains helpful information on preventing unwanted subsonic frequencies,
radio frequency interference, ground loops, and feedback oscillation.
When using network connections, pass the CAT 5 cable five times through a
ferrite core (Figure 2.4), available from Crown Audio Inc. This is to ensure
compliance with emission regulations.
2 Setup
Figure 2.3 IEC Power Connector Clip
IEC Power Connector
Slot
Slot Clip
Figure 2.4 Pass the CAT 5 Cable Five Times Through the Ferrite Core

Operation Manual
I-Tech HD Series PowerAmplifiers
page 8
2.3.2 Choose Input Wire and Connectors
Crown recommends using pre-built or professionally wired,
balanced line (two-conductor plus shield), 22-24 gauge cables
and connectors. Use 3-pin male XLR connectors.
Unbalanced line may also be used but may result in noise over
long cable runs.
Figure 2.5 shows connector pin assignments for balanced analog
wiring or AES/EBU digital wiring. The use of standard analog
cable with AES/EBU will result in diminished performance. For
best results, 110 ohm shielded twisted-pair cable for AES/EBU
signals is highly recommended. Figure 2.6 shows connector pin
assignments for unbalanced analog wiring.
NOTE: Custom wiring should only be performed by qualified
personnel.
2.3.3 Choose Output Wire and Connectors
Crown recommends using pre-built or professionally wired, high-
quality, two- or four-conductor, heavy gauge speaker wire and
connectors. Use Class 2 output wiring. You may use a 4-pole
Speakon® connector (Figure 2.7) or banana plugs, spade lugs, or
bare wire for your output connectors (Figure 2.8). To prevent the
possibility of short circuits, wrap or otherwise insulate exposed
loudspeaker cable connectors.
CAUTION – SHOCK HAZARD: Potentially lethal voltages
exist at the output connectors when the amplifier is
turned on and is passing a signal.
Using the guidelines below, select the appropriate size of wire
based on the distance from amplifier to speaker.
Distance Wire Size
up to 25 ft. 16 AWG
26-40 ft. 14 AWG
41-60 ft. 12 AWG
61-100 ft. 10 AWG
101-150 ft. 8 AWG
151-250 ft. 6 AWG
CAUTION: Never use shielded cable for output wiring.
Figure 2.5
Balanced Analog Input Connector Wiring or
AES/EBU Digital Connector Wiring
Figure 2.6 Unbalanced Analog Input Connector Wiring
2 Setup
Figure 2.8
Binding Post Connections
Figure 2.7
Left: Speakon®Output Connector on Back Panel
Right: Speakon®Cable Connector

I-Tech HD Series PowerAmplifiers
Operation Manual page 9
2.3.4 Stereo Mode Wiring
Typical input and output wiring is shown in Figure 2.9.
IMPORTANT: Turn off the amplifier and unplug its power cord.
INPUTS: Choose one of these options:
• Connect analog input wiring for both channels.
• Connect an AES/EBU digital signal to the AES/EBU connector.
OUTPUTS: Maintain proper polarity (+/–) on output connectors. Use
Class 2 output wiring.
Figure 2.9 shows how to wire stereo speakers to the binding posts.
Connect Channel 1 loudspeaker’s positive (+) lead to Channel 1 positive
(red) terminal of amp; repeat for negative (–). Repeat Channel 2 wiring as
for Channel 1.
To wire stereo speakers to the Speakon®connectors, use one of these
methods:
Method 1 (Table 1 and Figure 2.10): Wire one Speakon®cable connector
to two speakers. Insert the Speakon®cable connector into the amplifier’s
top Speakon®connector.
Method 2 (Table 2 and Figure 2.11): Plug the Channel 1 speaker into the
Channel 1 (top) Speakon®connector, and plug the Channel 2 speaker
into the Channel 2 (bottom) Speakon®connector.
2 Setup
Figure 2.10 Wiring Two Stereo Speakers
to the Top Speakon®Connector
PIN 1+ 1– 2+ 2–
CH 1+ 1– 2+ 2–
Stereo Wiring Method 1: Use Top Speakon®Only
Table 1
PIN 1+ 1–
CH 2+ 2–
PIN 1+ 1–
CH 1+ 1–
Stereo Wiring Method 2: Use Both Speakon®s
Channel 1
Loudspeaker
Channel 2
Loudspeaker
Top Speakon
(Channel 1)
Bottom
Speakon
(Channel 2)
Channel 1
Loudspeaker
Enceinte du
Canal 1
Lautsprecher
Kanal 1
Altoparlante
del Canal 1
Channel 2
Loudspeaker
Enceinte du
Canal 2
Lautsprecher
Kanal 2
Altoparlante
del Canal 2
Figure 2.9
System Wiring,
Stereo Mode
Figure 2.11
Stereo Wiring
Using Both
Speakon®
Connectors
Top
Bottom
Table 2

Operation Manual
I-Tech HD Series PowerAmplifiers
page 10
Figure 2.14
Wiring a Speaker in Bridge-Mono Mode to
the Top Speakon®Connector
Table 3
Top Speakon®Wiring for Bridge-Mono
PIN 1+ 2+
SPKR +–
2 Setup
2.3.5 Bridge-Mono Mode
Overview: Turn on the amp, enable Bridge-Mono mode using the LCD Control
Screen, turn off the amp, wire it, and turn it back on.
1. Be sure that no cables are connected to the amplifier. Turn on the front-panel power
switch. The LCD Control Screen will light up (Figure 2.12).
2. Under the LCD Control Screen, press the Menu/Exit button. Press the Next
button until you see OUTPUT MODE on the screen. If N/A is displayed, OUTPUT
MODE is locked via software. If LOCKOUT is displayed, all the LCD screens are
locked via software.
3. Press an Encoder knob to select BRIDGE MONO. Press the knob again to confirm
your choice. Press Menu/Exit. Turn down both level controls (Encoders) until you
reach maximum attenuation.
4. IMPORTANT: Turn off the amplifier and unplug its power cord.
INPUTS: There are three ways to connect an input signal to the amplifier (Figure
2.13):
• Connect an analog signal source to the Channel-1 amplifier input.
• Connect an AES/EBU digital signal source to the Digital Input IN connector.
NOTE: Crown provides a reference of wiring pin assignments for commonly used
connector types in the Crown Amplifier Application Guide available at
www.crownaudio.com.
OUTPUTS: Use Class 2 output wiring. There are two ways to wire the amplifier output
connectors for Bridge-Mono mode:
1) Wire the speaker across the red binding post of each channel (Figure 2.14). Do not
use the black binding posts when operating in Bridge-Mono mode.
2) Wire the speaker only to the top Speakon®connector as shown in Table 3 and
Figure 2.14.
Figure 2.12
The LCD Control Screen
NOTE: In Bridge-Mono
mode, the Channel 1
Level control sets the
level; the Channel 2 Level
control is defeated. All
Channel-2 objects and
controls are hidden and
disabled.
Menu/Exit Prev Next
Figure 2.13 Bridge-Mono Wiring to Binding Posts

I-Tech HD Series PowerAmplifiers
Operation Manual page 11
3.2 Startup Procedure
When first turning on your amplifier, follow the procedures in the
Quick-Start Guide on page 4 (stereo) or page 5 (bridge-mono).
If you ever need to make any wiring or installation changes, don’t forget
to disconnect the power cord.
For help with determining your system’s optimum gain structure
(signal levels) please refer to the Crown Amplifier Application Guide,
available online at www.crownaudio.com.
3.3 Precautions
Your amplifier is protected from internal and external faults, but you
should still take the following precautions for optimum performance
and safety:
1. Before use, your amplifier first must be configured for proper
operation, including input and output wiring hookup. Improper
wiring can result in serious operating difficulties. For information
on wiring and configuration, please consult the Setup section of
this manual or, for advanced setup techniques, consult Crown’s
Amplifier Application Guide available online at
www.crownaudio.com.
3 Operation
3.1 Protecting Your Speakers
It’s wise to avoid clipping the amplifier signal. Not only does clipping
sound bad, it can damage high-frequency drivers. To prevent clipping,
use System Architect software’s Level Max suite to enable or display
the peak voltage limiter and average power limiter in your amplifier’s
built-in DSP. That way, no matter how strong a signal your mixer
produces, the amplifier output will not clip. Set the limiter threshold so
that mixer signals above 0 dB or 0 VU on the mixer meters do not quite
drive the amplifier into clipping.
Also, avoid sending strong subsonic signals to the amplifier. High-
level, low-frequency signals from breath pops or dropped micro-
phones can blow out drivers. To prevent subsonic signals, use one of
these methods:
• Insert a highpass filter between mixer output and amplifier input (or
between mixer and limiter).
• Use the I-Tech’s onboard DSP to set up a highpass filters.
• Switch in highpass filters at your mixer. Set the filter to as high a
frequency as possible that does not affect your program. For example,
try 35 Hz for music and 75 Hz for speech. On each mixer input channel,
set the filter frequency just below the lowest fundamental frequency of
that channel’s instrument.
2. Use care when making connections, selecting signal sources and
controlling the output level. The load you save may be your own!
3. Do not short the ground lead of an output cable to the input signal
ground. This may form a ground loop and cause oscillations.
4. WARNING: Never connect the output to a power supply,
battery or power main. Electrical shock may result.
5. Tampering with the circuitry, or making unauthorized circuit
changes may be hazardous and invalidates all agency listings.
6. Do not operate the amplifier with the red Clip LEDs constantly
flashing.
7. Do not overdrive the mixer, which will cause clipped signal to be
sent to the amplifier. Such signals will be reproduced with extreme
accuracy, and loudspeaker damage may result.
8. Do not operate the amplifier with less than the rated load
impedance. Due to the amplifier’s output protection, such a
configuration may result in premature clipping and speaker
damage.
9. CAUTION – SHOCK HAZARD: Potentially lethal voltages
exist at the output connectors when the amplifier is
turned on and is passing a signal.
Remember: Crown is not liable for damage that results from
overdriving other system components.

Operation Manual
I-Tech HD Series PowerAmplifiers
page 12
3 Operation
Figure 3.1 Front Panel Controls and Indicators
3.4 Front Panel Controls and Indicators
Many of these functions can be disabled using
Blackout Mode (a selection in the Advanced
Menu, Section 4.2.3).
A. Cooling Vents
Front-to-rear forced airflow through foam dust filter
B. LCD Control Screen
Integrated LCD with white backlight, controls
amplifier setup and operation.
The LCD Control Screen and its controls let the user
adjust the amplifier’s attenuation and muting,
configure the amp, set up and view error monitoring
(such as temperature and load supervision), and
recall DSP presets. The presets allow the user to
quickly reconfigure the amp for various applications.
C. Power Switch
Push-on/push-off switch glows green when AC
power is present at the power cord and the amplifier
circuit breaker is in the “on” position.
D. USB 2.0 Connector
Accepts a USB drive to transfer presets from the
drive to the amplifier DSP, and vice versa.
E. Fault Indicator
Red LED, one per channel, flashes when the
amplifier output channel has stopped operating.
Usually this means that the amplifier must be
serviced.
F. Thermal Indicator
Red LED, one per channel, illuminates when the
channel has shut down due to thermal stress or
overload.
G. Clip Indicator
Red LED, one per channel, illuminates when the
channel’s output signal reaches the onset of audible
clipping. The Clip Indicator also will illuminate
during Thermal Level Control (TLC) limiting. The
Clip Indicator can be turned of during Blackout
mode.
H. Level Controls (Encoders)
Speed-sensitive, 0.5 dB steps, range 0 to –100 dB.
These two knobs affect the Channel-1 and
Channel-2 output levels. They also select Menu
items and adjust parameter values that are displayed
on the LCD control screen.
I. Menu/Exit Button
“Menu” enters the main menu. “Exit” leaves the
menu.
J. Prev Button
Selects the previous item in the menu.
K. Next Button
Selects the next item in the menu.
L. Signal Indicators
These can be disabled during Blackout mode. Three
green LEDS per channel indicate the amplifier’s input
and output signal levels. From top to bottom the
LEDs are
–10 dB: amplifier output is 10 dB below clipping.
–20 dB: amplifier output is 20 dB below clipping.
Signal: selected input signal is above –40 dBu.
M. Ready Indicator
Green LED, one per channel, illuminates when the
channel is initialized and ready to produce audio
output. Indicator is off when the channel is set to
standby mode via System Architect or in Blackout
mode.
N. Power Indicator
Blue LED indicates amplifier has been turned on and
AC power is available. The LED will flash when the AC
line voltage is 15% above or below the nominal rated
range. This indicator can be turned off in Blackout
mode.
O. Data Indicator
Yellow LED indicates network data activity. Data
indicator flashes only when the amplifier is polled for
data, or is polled to see whether it is online. This
indicator can be turned off in Blackout mode.
P Bridge Mode Indicator
Yellow LED illuminates when the amplifier is set to
Bridge-Mono mode.

I-Tech HD Series PowerAmplifiers
Operation Manual page 13
H. MAC Address
This specific amplifier’s network identifier that is burned into its
firmware.
I. Preset Indicator
LED flashes to signal the number of the current preset if active.
LED is green if the preset values have not been changed once
loaded. LED is yellow if the preset values have been changed
since they were loaded.
J. Reset Button
To restore factory default settings: Press the Reset Button with a
thin, non-conductive object, then turn on amplifier power, and
continue to hold the reset button until the Preset light comes
on green (approximately 16 seconds)..
K. Data Indicator
Flashes yellow only when the amplifier is polled for data, or is
polled to see whether it is online.
DIGITAL INPUTS SECTION
L. AES/EBU Digital Input
This 3-pin female XLR connector accepts a digital signal in the
AES/EBU format.
3 Operation
Figure 3.2 Back Panel Controls and Connectors
3.5 Back Panel Controls, Indicators
and Connectors
A. Fans
Provide front-to-back forced airflow for cooling.
ANALOG INPUTS SECTION
B. Balanced Analog XLR Inputs
A 3-pin female XLR connector for each channel.
C. Balanced Analog XLR Loop-Through
Outputs
Two 3-pin male XLR output connectors are provided
(one per channel). The signal at these connectors is
paralleled with the input signal for feeding the input
signal to other amplifiers.
OUTPUTS SECTION
D. 4-Pole Speakon®Output Connectors
Two high-current, 50A Neutrik®Speakon®NL4MLP
(mates with NL4FC and NL4), one per channel.
Class 2 output wiring required.
These two connectors accept 2-pole or 4-pole
Speakon®connectors. See Figures 2.5 through
2.10 and Tables 1, 2 and 3 for connector wiring.
The top Speakon®connector is wired for both
channels so it can be used for bridge-mono
wiring or for stereo wiring of two speakers to a
single Speakon®connector.
E. Binding Post Output Jacks
One pair per channel of high-current, 60A color-
coded binding posts. Accepts banana plugs,
wire or spade lugs.
F. Power Cord Connector
Standard 20 amp IEC inlet. Voltage range is
indicated above IEC inlet.
G. Reset Switch/Circuit Breaker
If the current draw of the amplifier exceeds safe
limits, this breaker automatically disconnects
the power supply from the AC mains. The switch
resets the circuit breaker.
MAES/EBU Digital Loop-through Output
Male XLR active/re-clocked AES/EBU digital loop-through.
The signal at this connector duplicates the digital input
signal for feeding the input signal to other amplifiers.
It is not recommended to loop through more than four
amplifiers. If larger distribution of AES is needed, the use of
an AES distribution amplifier is recommended.
NETWORKING SECTION
N. Link/Act Indicator
Shows network activity.The LINK ACT LED illuminates when
the network port is connected and flashes when network
activity is detected.
O. Network Connector
This EtherCon®Ethernet connector is for networking.
Warning: Only connect to networks that remain inside the
building.
P. Cond Indicator
Turns on if the amplifier is set to be the CobraNet conductor.
The CobraNet conductor is a CobraNet node that provides
the master timing clock for the CobraNet digital audio
transport network.

Operation Manual
I-Tech HD Series PowerAmplifiers
page 14
4 Advanced Operation
4.8.3 Levels and Indicators.....................................................27
4.8.4 Input Signal Router........................................................28
4.8.5 Source Configuration ....................................................29
4.8.6 CobraNet Advanced Settings .........................................29
4.8.7 Input Signal Compressor ..............................................30
4.8.8 Input Delay and Driver Delay..........................................30
4.8.9 Input EQ and Output EQ .................................................31
4.8.10 Crossover Filters .........................................................32
4.8.11 LevelMax Suite ...........................................................33
4.8.12 Front Panel Security ....................................................33
4.8.13 Amplifier Settings .......................................................34
4.8.14 Amplifier Information ..................................................35
4.8.15 Apply to Others ...........................................................35
4.8.16 Delay (Latency) ...........................................................35
4.8.17 Preset Manager ...........................................................36
4.8.18 Signal Generator..........................................................37
4.8.19 Fixed-Gain Mode in the I-Tech HD ...............................38
4.2 Navigating the LCD Control Screen ................... 15
4.2.1 Introduction ...................................................................15
4.2.2 Basic Selections ............................................................16
4.2.3 Advanced Menu.............................................................17
4.2.4 Monitor Menu ...............................................................20
4.2.5 Alert Menu.....................................................................20
4.2.6 Networking Menu ..........................................................21
4.2.7 CobraNet Menu .............................................................22
4.3 Presets.................................................... 23
4.3.1 Introduction...................................................................23
4.3.2 User Presets ..................................................................23
4.3.3 Downloadable Presets ...................................................23
4.4 File Transfer Via the USB Port ......................... 24
4.5 List of Pop-Up Boxes and Descriptions............... 25
4.6 Digital Audio Options (AES/EBU)...................... 26
4.7 Networking the Amplifier............................... 26
4.7.1 NetworkTroubleshooter...................................................26
4.8 Software-Controllable Onboard DSP ................. 26
4.8.1 Amplifier DSP Selection Screen.....................................27
4.8.2 Amplifier Mode .............................................................27
4.1 Advanced Operation Table of Contents.......14

I-Tech HD Series PowerAmplifiers
Operation Manual page 15
4.2 Navigating the LCD Control Screen
4.2.1 Introduction
The LCD Control Screen and its controls let you configure the
amplifier and access many features that before were available only
through a remote computer. Also, you can recall DSP presets via
the front panel. (Some DSP parameters cannot be adjusted with
the LCD Control Screen. That is done in System Architect.)
Figure 4.1 shows the parts of the LCD Control Screen. Its
functions are described below. NOTE: Listed functions can also be
controlled in System Architect.
4 Advanced Operation
Figure 4.1 Parts of the LCD Control Screen
Here’s how to access the various menus and settings in the LCD
control screen:
• Starting from the Attenuation screen, press Menu/Exit to go to
the Sample Rate screen.
• Press Next to go to the next item in the menu.
• Press Prev to go to the previous item in the menu.
• Turn or press either Encoder knob to change the value of the
displayed parameter.
• When you see a menu screen, push the knob once to see the
items in that menu. Or press Next to go to the next menu.
• Press Menu/Exit to leave the menu and return to the Attenuation
screen at any time.
Some menu items require confirmation: after you request a change,
the display might say “Press and hold.” To confirm a change, press
and hold an Encoder knob. If you don’t want the change to occur
during a confirmation, turn the knob or wait five seconds.
The entire front panel or just selected screens can be locked out or
set to read only status using System Architect software. Locked-out
screens will either say “Lockout” or the individual parameter will
say “N/A”. If a change is attempted the screen will say “Changes
Disabled”.
MENU TREE
Attenuation - Mute - Lockout
Menu button
Sample Rate
Analog Input Sensitivity
Presets
Amp Mode
Locate
ADVANCED MENU
(press knob once to access these
items:)
Attenuator Limits
Attenuator Link
Input Sources
Analog Source Select
Maximum Analog Input
Digital Source Select
AES Source Select
AES Input Trim
AES Input Status
Cobranet Source Select
Cobranet Input Trim
Bandpass Gain
Output Polarity
Input Delay
Speaker Delay
LED Meter Display Type
Bar Meter Display Type
LevelMax
Peak Voltage Limiter
RMS Voltage Limiter
Transducer Thermal Limiter
Pink Noise Generator
SLM (Sweep Load Monitoring)
Front Panel Blackout
Next Prev
Exit
MONITOR MENU
(press knob once to access
these items:)
Load Monitoring
Thermal %
Thermal Temp deg. C
AC Line Voltage
Operating Time
Watts Output
ALERT MENU
(press knob once to access
these items:)
Amp Output Clip Errors
Analog Input Clip Errors
Thermal Errors
Low Limit Load Errors
High Limit Load Errors
SLM Errors
Line Voltage Errors
Fan Errors
Clear All Error Logs
NETWORKING MENU
(press knob once to access
these items:)
Network Info
Manufacturing Info
HiQnet Node Address
DHCP
IP Address
Subnet Mask
COBRANET MENU
(press knob once to access
these items:)
Cobranet Information
Ch1 Cobranet Rx
Ch2 Cobranet Rx
Cobranet Tx
Cobranet Conductor Priority
Cobranet Transport Latency
Next
Next Next Next
Next
ALL MENUS: Next/Previous loops
Exit
Exit
Exit Exit
Next
To
Sample
Rate
Prev to
Cobranet
Menu
Level
Max
Suite
Figure 4.2 The Menu Tree
Menu Tree
As a handy reference, Figure 4.2 shows the menu
structure of the LCD control screen. Starting from
any Menu screen, press an Encoder knob to go to
the first selection in the Menu. You can loop
through a menu’s selections using the Next and
Prev buttons. The Menu/Exit button returns
you to the Attenuation screen which you see on
power-up.
Sweep Load Monitoring is not available
in early I-Tech HD models.

Operation Manual
I-Tech HD Series PowerAmplifiers
page 16
Operation Examples
Operation Example 1
How to set the CH1 input sensitivity using the LCD Control
Screen:
1. After power-up, when the Attenuation screen appears, press
Menu/Exit.
2. Press Next.
3. Turn the left Encoder to set the sensitivity. NOTE: If you do not
see the sensitivity you want, try changing the Maximum Analog
Input level (see below).
4. Press Menu/Exit.
Operation Example 2
How to set the Maximum Analog Input level using the LCD
Control Screen:
1. After power-up, when the Attenuation screen appears, press
Menu/Exit.
2. Press Next until you see “Advanced Menu.”
3. Push an Encoder knob.
4. Press Next until you see “Maximum Analog Input.”
5. Turn an Encoder to change the maximum analog input level.
Press an Encoder to confirm and save your setting.
6. Press Menu/Exit.
Operation Example 3
How to monitor the Thermal Errors using the LCD Control Screen:
1. After power-up, when the Attenuation screen appears, press
Menu/Exit.
2. Press Prev until you see “Alert Menu.”
3. Push an Encoder knob.
4. Press Next until you see “Thermal Errors.
Now let’s look at the function of each menu selection.
4 Advanced Operation
Front Panel Lockout (in the Attenuation screen)
The amplifier’s administrator can control access to menu mode and the
amplifier’s attenuators. This lockout can be done either by the front
panel buttons or by System Architect software.
To lock or unlock the menu with the front-panel buttons: press Next
and Prev simultaneously. To lock or unlock the menu with System
Architect software: go to the Tools Menu > Display Screen Security and
press the lockout button. If a specific parameter is protected, the
screen says “N/A” or “Change Disabled.”
If the lockout is done from the software, the user can disable the lockout
only in the software, not by pressing the front-panel buttons.
If the menu is locked and you press any button or turn an Encoder, the
word “LOCKOUT” is displayed. If a specific parameter is protected, the
screen says “N/A” or “Change Disabled.”
Mute/Unmute (in the Attenuation screen)
• To mute either channel: Press and hold an Encoder knob for
1 second. The display will alternate between MUTE and the attenuation
level. While the amplifier is muted, you can adjust attenuation for each
channel by turning an Encoder knob.
• To unmute either channel: Press and hold an Encoder knob again for
1 second.
Opening Screen: On power-up, the LCD Control Screen displays the
Crown logo. After a few seconds, the firmware version appears, then the
Attenuation screen appears.
Attenuation and Bar Meters
This screen displays the attenuation in dB and on bar meters. To change
the attenuation in either channel, turn the Encoder. Attenuation changes
0.5 dB per detent when you turn the Encoder slowly, and more when you
turn the Encoder quickly. The current preset name is displayed in the
upper-right corner. The (M) is explained on the next page under Presets.
Powered By
Powered By
(Power On) 1.0.0.5
Powered By
-30.0
Attenuation Default (M)
Attenuation Default (M)
-30.0
dB
-30.0
Attenuation Default (M)
Attenuation Default (M)
MUTE
dB
4.2.2 Basic Selections

I-Tech HD Series PowerAmplifiers
Operation Manual page 17
Presets: A preset is a group of DSP and amplifier settings for a particular
speaker system. Turn an Encoder to view Presets 1 through 50. To recall a
preset, press the Encoder, then press and hold the Encoder to confirm. For
more information on presets, see Section 4.3.
The preset currently in use is displayed in the upper right corner.
(A) Active means that the amplifier is operating exactly according to that
preset.
(M) Modified means that the amplifier is operating according to the preset
but with some settings changed.
If a preset number is flashing, it is not in use.
In the example shown below,
• Preset 7 is in use (it’s in the upper right corner).
• The amplifier settings have been modified (M) since Preset 7 was loaded.
• The large “7” is not flashing, which means that Preset 7 is in use.
Locate: Allows users to identify a specific amplifier in a large network of
amplifiers without having to compare address information. Locate can be
turned on/off from software and/or the front panel. Press an Encoder knob to
turn on the Locate function. When on, the LCD screen flashes. Press the knob
again to turn off the Locate function. In System Architect, the device icon has a
blue outline to indicate that it is in Locate mode.
4 Advanced Operation
In the example shown below, you turned down an Encoder knob two notches
after loading Preset 7.
• Preset 7 is in use (it’s in the upper right corner).
• Preset 7 is active (A). That means the amplifier is operating exactly according
to that preset.
• The large “5” is flashing because Preset 5 is not in use.
• Preset 5’s Channel-1 label is “LF–1&2.”
• Preset 5’s Channel-2 label is “LF–3&4.”
Sample Rate: Starting from the Attenuation screen, press Menu/Exit to go
to the Sample Rate screen. The sample rate of the amplifier’s DSP is displayed.
It can be modified only in System Architect software because all of the FIR filter
settings will need to be recalculated as a result of the change. Please refer to its
Help files. When you route a Cobranet input, the sample rate displayed here
must match the Cobranet source.
96 kHz
Sample Rate
Sample Rate
Modify in software ONLY!
Modify in software ONLY!
Analog Input Sensitivity: Turn the left Encoder knob to change the Ch. 1
input sensitivity; turn the right Encoder knob to change the Ch. 2 input
sensitivity. This screen also displays the amp gain for each channel resulting
from the sensitivity settings. See Figure 4.4.
Note: If you do not see the sensitivity you need, try changing the Maximum
Analog Input level in the Advanced Menu (described later). This makes
different sensitivities available.
To optimize the system gain structure, see Section 3.1 in the I-Tech application
Guide at www.crownaudio.com/itech/pdf/137327.pdf.
2.90
Analog Input Sensitivity
Analog Input Sensitivity
31.5
2.90
31.5
Vrms
dB Gain
Amp Mode: This screen lets you set up the amplifier for Dual, Input Y or
Bridge Mono mode. Turn an Encoder knob to choose among those three
options, then press the knob to save your choice. You will be prompted to
confirm your choice. The LCD screen displays the currently selected mode.
In Dual (or Stereo) mode, both channels operate independently.
In Bridge Mono mode, both channels are summed to double the power, and the
amplifier puts out a mono signal.
In Input Y mode, Channel 1’s input signal feeds both channels, and each
channel can be set to a different output level, usually for bi-amp operation.
<Dual>
Amp Mode
Amp Mode
Turn to Set-Press to Save
7
Presets Preset7 (M)
Presets Preset7 (M)
CH1:MF-1&2
CH2:MF-3&4
Preset7
5
Presets Preset 7(A)
Presets Preset 7(A)
CH1:LF-1&2
CH2:LF-3&4
Preset7
4.2.3 ADVANCED MENU
When you see this screen, press an Encoder knob to access the selections in
the Advanced Menu, described next. To get to the Advanced Menu screen from
the Attenuation screen, press Menu/Exit twice, then press Next five times.
Advanced Menu
Advanced Menu
Advanced Menu
Push knob for adv. menu
OFF
Locate
Locate
Press enc to toggle

Operation Manual
I-Tech HD Series PowerAmplifiers
page 18
Input Sources: For each channel, turn the Encoder to select analog, digital,
or automatic backup source. Options are:
Analog
Digital
Digital with analog backup <Digital A-Backup>
Digital with analog override <Digital A-Ovride>
Digital with analog backup: The I-Tech HD is being fed a digital signal and an
analog signal. The input is currently switched to the digital signal. If it fails, the
I-Tech HD switches instantly to the analog signal.
Digital with analog override: The input is switched to the digital signal, and no
analog signal is applied. If an analog signal is sent, the I-Tech HD switches
instantly to the analog signal. If the analog signal fails, the I-Tech HD switches
to the digital signal after a delay set by the Hold Time slider in the Input Section
of the System Architect page.
Maximum Analog Input: Turn an Encoder to select the maximum input level
to the amplifier: +21 dBu or +15 dBu. Press the knob to confirm your selection.
Note: Changing this value changes the range of sensitivities available to the
amplifier.
For more information see Figure 4.4 and the I-Tech Sensitivity Charts in the
Appendix of the I-Tech Application Guide. It is available online at www.
crownaudio.com/itech/pdf/137327.pdf.
4 Advanced Operation
Attenuator Limits: You can set the maximum attenuation from 0 dB to
–100 dB. This feature allows you to set a limit on the attenuators. Once set,
attenuation cannot be adjusted beyond this level. The attenuator limit appears
as a line in the attenuator bar meter.
NOTE: The attenuator setting must be below the attenuator limit that you are
trying to set. For example, if the attenuator is set at –3 dB, you cannot set the
attenuator limit below –3 dB unless you decrease the attenuator level.
0.0
Attenuator Limits
Attenuator Limits
dB
dB
0.0
Attenuator Link You can set the attenudators to be independent or linked.
Turn an Encoder knob to choose one of those options, then press the knob to
save your choice.
INDEPENDENT
Attenuator Link
Attenuator Link
Turn to Set-Press to Save
Turn to Set-Press to Save
<Analog> <Digital>
Input Sources
Input Sources
Analog Source Select: Turn the left Encoder knob to select Analog 1,
Analog 2, or Analog 1+2 signals for Channel 1. The right Encoder does the
same for Channel 2. Press the knob to confirm your selection.
Analog 1 is Analog input Channel 1.
Anolog 2 is Analog input Channel 2.
Analog 1 +2 is Analog input Channels 1 and 2.
Analog Analog
Analog Source Select
Analog Source Select
12
+15dBu
Maximum Analog Input
Maximum Analog Input
Turn to Set-Press to Save
Turn to Set-Press to Save
Digital Source Select: Turn the left Encoder knob to select the digital source
for Channel 1: AES or Cobranet. The right Encoder does the same for Channel
2. Press the knob to confirm your choice.
Digital Source Select
Digital Source Select
AES <Cobra
net>
AES Source Select: Turn the left Encoder knob to select the digital source for
Channel 1: AES1, AES2, or AES1+2. The right Encoder does the same for
Channel 2. Press the knob to confirm your choice.
AES 1 is AES input Channel 1.
AES 2 is AES input Channel 2.
AES 1 +2 is AES input Channels 1 and 2.
AES
AES Source Select
AES Source Select
AES
12
AES Input Trim: Turn the left Encoder knob to vary the gain of the AES digital
signal for Channel 1: -100.0 dB to +20 dB. The right Encoder does the same for
Channel 2. See Figure 4.4 for more information.
0.0
AES Input Trim
AES Input Trim
0.0
dB
AES Input Status: “Lock” indicates that an AES cable is plugged in and the
amplifier is receiving (and locking to) the AES clock pulse. “No Lock” means
that the amplifier is not receiving, or is not locking to the AES clock pulse.
No Lock
AES Input Status
AES Input Status
CobraNet Source Select: Turn the left Encoder knob to select the CobraNet
source for Channel 1: Cnet1, Cnet2, or Cnet 1+2. The right Encoder does the
same for Channel 2. Press the knob to confirm your choice.
Cnet1 is Bundle A.
Cnet2 is Bundle B.
Cnet 1+2 is Bundles A+B.
Cnet 1
Cobranet Source Select
Cobranet Source Select
Cnet 2
CobraNet Input Trim: Turn the left Encoder knob to vary the gain of the
CobraNet digital signal for Channel 1: -100.0 dB to +20 dB. The right Encoder
does the same for Channel 2. See Figure 4.4 for more information.
0.0
Cobranet Input Trim
Cobranet Input Trim
0.0
dB

I-Tech HD Series PowerAmplifiers
Operation Manual page 19
Pink Noise Generator: Press an Encoder knob to turn on the generator. Its
level will read –100 dB. Adjust the noise level from –100 dB to +20 dB in 0.5 dB
steps by turning Encoder 1 or 2. To turn off the generator, press an Encoder knob
or go to another menu item.
Exit: To exit the Advanced Menu and go to the Attenuation screen, press Menu/
Exit once.
LevelMax - RMS Voltage Limiter: Limits the output rms voltage to an
amount that you set, either OFF or 1 to 500 volts, for each channel. Press the
Encoder to turn on the Limiter. Once it’s on, turn the Encoder to set the voltage.
Input Delay: Sets the input signal delay in each channel. Turn each channel’s
Encoder knob to vary the delay. The delay step size is speed sensitive. Pressing
the encoder enables or disables the Delay.
Below each channel’s delay setting is the equivalent distance in feet and meters.
For example, 10 ms is the signal delay of sound traveling 11.3 feet or 3.4 m.
Output Polarity: Press each channel’s Encoder knob to toggle the output
signal polarity between + and –.
Bandpass Gain: In each channel of the I-Tech HD’s DSP, just before the
output limiter and after the preceding filter, is a gain block (not shown on the
Signal Path block diagram). Bandpass Gain adjusts the gain of this block
between -24 dB and +24 dB.
Adjusting the bandpass gain in the LCD screen makes it easy to vary the level of
subwoofers, midrange drivers and high-frequency drivers.
Front Panel Blackout: This screen lets you black out the front panel display
unless you press a front-panel button or turn an Encoder. This feature turns
off the LCD backlight and all front panel LEDs except for the fault LEDs and
power-switch green LED. After blackout is enabled, an Encoder press/turn
will “reactivate” the display. If no button is pressed/turned for 5 seconds, the
display will return to blackout mode.
0.0
Bandpass Gain
Bandpass Gain
0.0
dB
+
Output Polarity
Output Polarity
+
Press enc to toggle
0.0000
Input Delay
Input Delay
0.0/0.0
0.0000
0.0/0.0
ms
ft/m
Output Delay: Sets the output signal delay in each channel. Turn each
channel’s Encoder knob to vary the delay. The delay step size is speed sensitive.
Pressing the encoder enables or disables the Delay.
Below each channel’s delay setting is the equivalent distance in feet and meters.
For example, 10 ms is the signal delay of sound traveling 11.3 feet or 3.4 m.
0.0000
Speaker Delay
Speaker Delay
0.0/0.0
0.0000
0.0/0.0
ms
ft/m
LED Meter Display Type : Here you can set the LCD bar meters to display
average or peak levels. Turn an Encoder knob to select the option, then press
the knob to confirm your selection.
Bar Meter Display Type: You can select what the bar meters will display in
the Attenuator Screen. Press an Encoder knob to select Attenuation, Input
Levels, Output Levels, or Thermal %. Attenuation is displayed as the length of
the bar meters in the Attenuation screen that appears on startup. The meters
display average input levels and output levels.
ATTENUTATION
Bar Meter Display Type
Bar Meter Display Type
Turn to Set-Press to Save
LevelMax- Peak Voltage Limiter: Limits the peak output voltage to a level
that you set, either OFF or 1 to 500 volts, for each channel. Press an Encoder to
turn on the Limiter. Once it’s on, turn the Encoder to set the voltage. Additional
controls, such as attack and release, are available through System Architect.
LevelMax - Clip Limiter: Limits the peak output voltage to just below
clipping for each channel. Press an Encoder knob to turn it OFF or ON.
OFF
Clip Limiter
Clip Limiter
OFF
OFF
Peak Voltage Limiter
Peak Voltage Limiter
OFF
v
v
OFF
RMS Voltage Limiter
RMS Voltage Limiter
OFF
v
v
OFF
Pink Noise Generator
Pink Noise Generator
OFF
dB
dB
4 Advanced Operation
OFF
Front Panel Blackout
Front Panel Blackout
AVERAGE
LED Meter Display Type
LED Meter Display Type
Turn to Set-Press to Save

Operation Manual
I-Tech HD Series PowerAmplifiers
page 20
4 Advanced Operation
Thermal Errors: This screen lets you view thermal errors without using the
control software. A thermal error occurs if the amplifier thermal % exceeded
the value set with the Thermal slider on the Amplifier Settings page in System
Architect.
When an error occurs, the count displayed in this screen is incremented, and
the operating time since the error is displayed.
To clear this screen, press and release an Encoder. The display will prompt you
to confirm your choice by pressing and holding the Encoder.
NOTE: You must use System Architect to enable error reporting and set its
limits.
Amp Output Clip Errors: A clip error occurs if the number of clip events in
the amplifier output exceeds the value set with the Count slider (within the
time set by the Time slider) on the Amplifier Settings page in System Architect.
Load Monitoring: Press an Encoder knob to turn speaker load monitoring on
or off for either channel. When load monitoring is on, the load connected to the
amplifier output is displayed. The text below the reported load indicates
whether the value is within the limits set in System Architect. OFF means load
monitoring is off. LOW means the load is below limits. HIGH means the load is
above limits. NORMAL means the load is within limits.
OFF
Load Monitoring
Load Monitoring
Normal
OFF
Normal
Thermal %: This indicates the amplifier temperature in percent, where 100%
is the maximum allowable temperature. If Thermal % reaches 100%, the
amplifier is out of thermal headroom and has shut down (or will very soon).
Measurements are shown for Channel 1, Channel 2, and the power supply.
AC Voltage: This shows the AC line voltage at the AC cord inlet to the
amplifier.
0
Thermal %
Thermal %
Ch1 PS
0
0
Ch2
Thermal Temp deg. C: This screen displays the temperature in degrees
Celsius of the Ch. 1 output devices, Ch. 2 output devices, and the power
supply.
23
Thermal Temp deg. C
Thermal Temp deg. C
Ch1 PS
23
Ch2
36
120 VAC
AC Voltage
AC Voltage
Operating Time: This displays the number of hours the amplifier has been
on since manufacture. Like a car’s odometer, it shows the total amount of
operating hours and cannot be reset. All I-Tech HD amplifiers come with a
variable amount of operating time on them due to burn-in and testing before
shipping.
108.8 Hrs
Operating Time
Operating Time
Watts Output: This displays the slow-averaged continuous output power of
each channel in watts.
Watts Output
Watts Output
Ch1
Ch1
Ch2
Ch2
0.0 0.0
4.2.5. ALERT MENU
To access this menu from the Attenuation screen, press an Encoder knob, then
press Prev three times. This menu displays a wide variety of errors in the
signal, amplifier, or load. Push an Encoder knob to see the selections in the
Alert Menu.
Alert Menu
Alert Menu
Alert Menu
Push knob for alerts
0
Amp Output Clip Errors
Amp Output Clip Errors
0.0 Hrs
0.0 Hrs
0.0 Hrs
0.0 Hrs
0
Last
Last
0
Analog Input Clip Errors
Analog Input Clip Errors
0.0 Hrs
0.0 Hrs
0.0 Hrs
0.0 Hrs
0
Last
Last
0
Thermal Errors
Thermal Errors
0.0 Hrs
0.0 Hrs
0.0 Hrs
0.0 Hrs
0
Last
Last
Analog Input Clip Errors: A clip error occurs if the number of clip events in
the analog input exceeds the value set with the Count slider (within the time
set by the Time slider) on the Amplifier Settings page in System Architect.
When an error occurs, the count displayed in this screen is incremented, and
the operating time since the error is displayed.
To clear this screen, press and release an Encoder. The display will prompt you
to confirm your choice by pressing and holding the Encoder.
NOTE: You must use System Architect to enable error reporting and set its
limits.
Exit: To exit the Monitor Menu and go to the Attenuation screen, press Menu/
Exit once.
4.2.4 MONITOR MENU
This menu lets you monitor the status of the amplifier. Starting from the
Attenuation Screen, press Menu, then press Prev four times. Or, starting from
the Advanced Menu screen, press Next to go to the Monitor Menu screen. Then
press an Encoder knob to access the selections in this menu.
Monitor Menu
Monitor Menu
Monitor Menu
Push knob for mon. menu
When an error occurs, the count displayed in this screen is incremented, and
the operating time since the error is displayed.
To clear this screen, press and release an Encoder. The display will prompt you
to confirm your choice by pressing and holding the Encoder.