Harman AXYS PB-400 Instruction Manual

Shaping the future of sound reinforcement
Installation & User Manual
AXYS®IndustryAmp
Models PB-400, PB-800, PB-400-CN, PB-800-CN
(Part Nos. 590401, 590801, 590403, 590803)

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2
REFERENCE TO EC STATEMENT OF CONFORMITY
This document confirms that products manufactured by
DuranAudio bearing the CE label meet all the requirements
in the EMC directive 2004/108/EC and LV directive 2006/95/
EC laid down by the Member States Council for adjustment
of legal requirements. Furthermore the products comply
with the rules and regulations from 30 August 1995
referring to the electromagnetic compatibility of devices.
Duran Audio products bearing the CE label comply with
the following harmonised or national standards:
EMC:
EN 55103-1:1996; E1, E2, E3
EN 55103-2:1996; E1, E2, E3
Safety:
IEC 60065:2001 (ed7) +A1:2005 +A2:2010
Mains Harmonics:
EN 61000-3-2:2001
Insulation:
Class1
Duran Audio BV Koxkampseweg 10
5301 KK Zaltbommel
The Netherlands
Tel: [phone]
Fax: [phone]
Zaltbommel, December 2014
USER’S NOTICE AND DISCLAIMER
No part of this manual may be reproduced, transmitted,
transcribed, stored in a database system or translated
without the express written permission of Duran Audio BV.
Documentation kept by the end user for back-up purposes
is excluded from the above.
All products and corporate names mentioned in this
manual may be registered trademarks or copyrights
of their respective companies. They are used here for
indicative purposes only.
The information contained in this manual has been carefully
checked for accuracy; however no guarantee is given with
respect to its correctness. Duran Audio BV accepts no
responsibility or liability for any errors or inaccuracies that
may appear in this manual or the products described in it.
Specifications and information contained in this manual
are subject to change at any time without notice.
© 1998-2016 Duran Audio BV. All rights reserved.

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TABLE OF CONTENTS
REFERENCE TO EC STATEMENT OF CONFORMITY .......................2
User’s Notice and disclaimer ............................................ 2
TABLE OF CONTENTS ............................................3
IMPORTANT SAFETY INSTRUCTIONS.................................4
INTRODUCTION.................................................5
Applicable models.................................................... 5
Overview........................................................... 5
Features ........................................................... 6
What’s in the packaging ............................................... 6
GENERAL DESCRIPTION ..........................................7
Block diagram and system description .................................... 7
Front Panel ......................................................... 9
Rear Panel .......................................................... 9
INSTALLATION AND OPERATION ...................................10
Mechanical Installation............................................... 10
Ventilation................................................... 10
Connector and Wiring details .......................................... 11
AC Mains.................................................... 11
Audio Connections .................................................. 12
Analogue inputs .............................................. 12
Amplifier outputs ............................................. 12
CobraNet®interface ........................................... 13
ANS microphone input ......................................... 13
Control connections ................................................. 14
RS-485 interface .............................................. 14
Failure relay.................................................. 15
Ambient temperature sensor..................................... 16
DSP section overview ................................................ 17
Level controls ................................................ 18
EQ adjustment................................................ 18
Delay ....................................................... 18
Autogain .................................................... 18
Surveillance functions ................................................ 18
Auto-input switching........................................... 18
Failure relay.................................................. 19
Presets ........................................................... 19
CobraNet®configuration.............................................. 20
DSP bypass ........................................................ 20
Load Monitoring .................................................... 20
Amplifier protection ................................................. 20
Surge protection .............................................. 20
Power-on delay ............................................... 20
APPENDIX ....................................................21
Technical Specifications............................................... 21
Maintenance and Warranty Information .................................. 21
Common Analogue Grounding Issues .................................... 21
Software and Firmware Updates ........................................ 22
Network Cables..................................................... 22

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This symbol is intended to alert you to the
presence of uninsulated dangerous voltages
within the product’s enclosure that may be of sufficient
magnitude to constitute a risk of electric shock.
This symbol is used throughout this manual and
is intended to alert you to the presence of
important instructions.
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 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 polarised or
grounding-type plug. 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.
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
manufacturer.
12. Unplug this apparatus during lightning storms or
when unused for long periods of time.
13. Refer 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.
Warning - To reduce the risk of fire or electric
shock, do not expose this apparatus to rain or
moisture and objects filled with liquids, such as vases,
should not be placed on this apparatus.
Warning - To disconnect this apparatus from the
mains power supply, turn off the power at the
power switch on the rear panel and remove the PowerCon®
connector from the mains input socket labelled Mains on
the rear panel.
Warning - The PowerCon®connector should
never be plugged or unplugged when there is
power on the connector, regardless of whether the
amplifier is switched on or not. ALWAYS ensure that the
mains supply is turned off at source before inserting or
removing the PowerCon®.
Warning - This apparatus is a Class I device and
must be connected to a mains socket outlet that
provides a safety ground connection.
IMPORTANT SAFETY INSTRUCTIONS

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Thank you for purchasing this AXYS®IndustryAmp.
In order to get the best out of your IndustryAmp, please
take the time to read through this manual before you
install and use it for the first time.
APPLICABLE MODELS
This manual covers the installation and operation of the
following models:
• IndustryAmp Model PB-400 (Part No. 590401): 2
analogue inputs, 4 x 250 W output into 40 ohm load
• IndustryAmp Model PB-800 (Part No. 590801): 2
analogue inputs, 8 x 100 W output into 100 ohm load
• IndustryAmp Model PB-400-CN (Part No. 590403):
2 analogue inputs plus dual-redundant CobraNet®
interface, 4 x 250 W output into 40 ohm load
• IndustryAmp Model PB-800-CN (Part No. 590803):
2 analogue inputs plus dual-redundant CobraNet®
interface, 8 x 100 W output into 100 ohm load
NOTE: There are two further IndustryAmp models, the
PB-400-LI and PB-400-CN-LI, which are intended for
driving low-impedance loudspeaker systems. Please note
that this manual does not apply to these models.
OVERVIEW
The AXYS®IndustryAmp is a multichannel power amplifier
specifically designed for permanent installation in life-
safety and other critical applications. It is designed to drive
loudspeakers in distributed 70 V or 100 V line systems. The
core of the amplifier is a DSP (Digital Signal Processing)
block, which allows comprehensive adjustment of the
audio signals in each channel. The unit also incorporates
a number of fail-safe features, making it very reliable and
suitable for use in life-critical situations.
The IndustryAmp is configured, controlled and monitored
using AXYS®WinControl software, via either RS-485 or
CobraNet®(if fitted).
INTRODUCTION

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FEATURES
All models:
• Transformer-coupled outputs for direct drive of 70 V /
100 V line systems
• Full complementary Class AB output stages
• MOSFET output devices with high current safety
margin
• Stable operation under all normal conditions
• Two transformer-balanced analogue inputs (0 dBV)
• On-board DSP, providing control of level, EQ, delay,
etc. on all inputs and outputs
• Full configuration, control and monitoring using
AXYS® WinControl software
• Non-volatile storage of all amplifier parameters
• Control interface via RS-485
• Pilot tone detection
• ANS (Ambient Noise Sensing) mic input
• Ambient temperature sensor input
• Surveillance/failure relay
• DSP bypass function
• Universal power supply (100-240 VAC) with active
Power Factor correction
Additional features for PB-400-CN and PB-800-CN
• Integral dual-redundant CobraNet®audio networking
card
• 8 digital audio inputs
• 8* digital audio outputs
• CobraNet®Serial Bridge allowing Ethernet to be used
for control instead of RS-485
WHAT’S IN THE PACKAGING
In addition to the IndustryAmp itself, each unit is shipped
with the following items:
• Installation and User Manual (this document)
• AC power cable (2 m),fitted with a Neutrik PowerCon®
connector and a European-style mains plug
• Set of mating screw terminal connectors
*Amplifiers with early serial numbers have two digital audio outputs, sufficient to permit “re-broadcasting” of an ANS mic signal.
Please contact your AXYS®Audio distributor if there is any doubt which model you have.

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GENERAL DESCRIPTION
BLOCK DIAGRAM AND SYSTEM DESCRIPTION
DSP
Processing
Micro
Controller
PSU
Bypass
Amps Relays Transformers
Load
Monitoring
Surge
Protection
Input
1Out 1
Out 2
Out 3
Out 4
Input
2
RS-485 Internal Temperature
PB-400-CN and PB-800-CN only
Fan Monitoring
Front LED
Internal
Supplies
Mains
Ambient
Temperature
Sensor
External
Failure
Relay
Analogue
Pilot
detect
Digital
Inputs
3-10
CobraNet®
Serial Bridge
1
2
3
4
Out 5
Out 6
Out 7
Out 8
5
6
7
8
To Amps
CobraNet®
Digital
Pilot
detect
x8
CobraNet®
8 x Digital Outputs
Ambient
Noise
Sensing
Mic
PB-800 and PB-800-CN only

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The simplified block diagram above shows the unit’s
internal signal routing.
The unit has two analogue inputs, making it suitable for
connection to primary and secondary audio sources in life-
safety applications. The inputs are transformer-balanced
and offer low noise and very high CMRR (Common-Mode
Rejection Ratio).
The audio transformers fitted to the analogue inputs are
of professional grade and provide full galvanic isolation
from source and destination equipment, eliminating the
potential for ground loops to occur between items of
equipment which may be running on different AC supplies.
The analogue input andA-D converter stages accept a peak
signal level of +19 dBV without clipping. (At high input
levels, the digital gain within the DSP block will normally
need to be reduced to avoid continuous activation of the
limiter section.)
Both inputs are routed to all amplifier channels - four in
the PB-400(-CN) and eight in the PB-800(-CN) - via the
DSP core.
The amplifier power section employs a fully complementary
Class AB design, using MOSFET devices with a much higher
current rating than is necessary for normal operation. The
power stages feature power-on delay, load monitoring and
surge protection.
Both analogue inputs feed a pilot tone detector so that
continuous monitoring of the input connections may
be made. The detector will, when enabled, switch from
Input 1 to Input 2 if pilot tone is lost. The IndustryAmp
incorporates surveillance functions which activate an
externally-accessible failure relay in the event of a PSU or
other malfunction, or a loss of pilot tone.
If the IndustryAmp is fitted with the optional CobraNet®
card, a further eight, digital audio inputs are available.
These are routed to the DSP core along with the analogue
inputs, and are also continuously monitored for pilot-tone,
with the same auto-switching arrangement as the analogue
inputs. All active inputs (as enabled via WinControl) are
routed to all output channels. The CobraNet®interface
is bi-directional, and the input from an optional Ambient
Noise Sensing microphone can be routed to two of the
eight* outputs. The CobraNet®card also allows the
IndustryAmp to be controlled by WinControl using the
Ethernet connection via CobraNet’s Serial Bridge.
The high-power main supply is conservatively rated and
operates on any AC supply voltage from 100 V to 240 V,
and incorporates active Power Factor correction to
minimise mains harmonics in the audio. Apart from the
main supply, the IndustryAmp is also equipped with a low-
power standby supply. This power supply allows the device
to be powered on and off under network control.
*Amplifiers with early serial numbers have two digital audio outputs (ANS microphone signal only).
Please contact your AXYS®Audio distributor if there is any doubt which model you have.

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FRONT PANEL 1
1. Status LED – bi-colour LED: normal (green), failure (red).
REAR PANEL
R
2
671718
34 5 8 9 10 11 19 20
12 13 14 15 16
2. Failure relay connector
3. ANS mic input
4. RS-485 port
5. Temperature sensor connector
6. Analogue input 1
7. Analogue input 2
8. Output 1
9. Output 2
10. Output 3
11. Output 4
12. Output 5*
13. Output 6*
14. Output 7*
15. Output 8*
16. Mains power connector
17. CobraNet®Port A**
18. CobraNet®Port B**
19. Mains switch†
20. Mains fuse†
Wiring details for all the rear connectors can be found in
subsequent sections of the manual.
* Not present on PB-400 and PB-400-CN
** Not present on PB-400 and PB-800
†
Amplifiers with early serial numbers are equipped with a mains switch with integrated over-current protection located on the
front panel. Please contact your AXYS®Audio distributor if there is any doubt which model you have.

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MECHANICAL INSTALLATION
The IndustryAmp is designed to be mounted in a standard
19” equipment rack. The front panel is fitted with
rackmount ears for this purpose.The IndustryAmp occupies
3U of vertical rack space.
Note that due to the weight of the amplifier (over
20 kg), the use of additional rear supports is
strongly recommended. The rear of the unit has additional
mounting points to facilitate this.
Ventilation
The IndustryAmp is forced-air cooled by two internal
temperature-controlled fans. This ventilation method
should ensure that amplifier remains within its operational
temperature range under most circumstances, but if it is
to be installed in a location of high ambient temperature,
and/or in a rack containing a significant quantity of other
heat-generating equipment (see below), consideration
should be given to climate-controlling the room in which
the equipment rack is situated.
Do not install the IndustryAmp in a 19” rack
immediately above or below another item of
equipment generating a significant amount of heat (e.g.,
another power amplifier). Plain 1U blank panels should be
used as spacers. Note that slotted or perforated ventilation
panels should not be used, as these will reduce the effect
of forced-air cooling. Also, be aware of the rear-to-front
direction of airflow of the IndustryAmp; it is not good
practice to install equipment employing forced-air cooling
with different directions of airflow in the same enclosed
rack.
Airflow is via the grilles at the rear (intake) and
front (exhaust) of the amplifier. Ensure that both
sets of grilles are completely clear of any obstructions
within 100 mm (4”) in order to maintain the necessary
airflow.
INSTALLATION AND OPERATION

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CONNECTOR AND WIRING DETAILS
AC Mains
AC power is via a rear panel Neutrik®PowerCon®
Type 20 mains connector [16]. A mating mains
cable (power cord) fitted with a European-style plug is
supplied with the unit. If the standard AC outlets in the
territory are of a different type, the correct type of mains
plug should be substituted, carefully observing the
following cable colour codes:
CONNECT COLOUR
(EUROPE) COLOUR (US)
Live Brown Black
Neutral Blue White
Earth (Ground) Green/Yellow Green
The IndustryAmp incorporates a “universal” PSU, and will
operate on all AC mains voltages from 100 V to 240 V.
NOTE: The IndustryAmp has an AC mains fuse.
The fuseholder is on the rear panel [20]. In the
event of the fuse blowing, always first investigate why it
blew. Always replace by a fuse of the same type and rating
as indicated on the rear panel and/or in the amplifier
datasheet.*
NOTE: The PowerCon®connector should NEVER
be plugged in or unplugged while AC mains is
present. This applies whether or not the amplifier is
switched on. ALWAYS isolate the AC mains supply at its
source before plugging or unplugging the connector.
Warning - This apparatus is a Class I device and
must be connected to a mains socket outlet that
provides a safety ground connection.
* Amplifiers with early serial numbers are not equipped with a separate fuse holder. Over-current protection is integrated into the mains switch.
Please contact your AXYS®Audio distributor if there is any doubt which model you have.
Warning - Presence of mains voltage is not
indicated by the LED on the front panel. This LED
indicates the status of the IndustryAmp and cannot be
used as a mains voltage indicator.
If the mains switch of the IndustryAmp is not
readily accessible after installation to disconnect
the unit when necessary, the mains connection to the
IndustryAmp should incorporate a manual circuitbreaker
or an accessible mains plug.
1.
3.
2.
2.
1.
Plugging in
Unplugging
fig.1: PowerCon Connector

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AUDIO CONNECTIONS
Analogue inputs
The analogue audio inputs use 3-pin 3.81 mm-pitch screw
terminal connectors. Mating connectors are supplied with
the unit. The inputs should be wired according to the
diagram below:








fig.2: Analogue Inputs
To minimise hum and noise pickup, balanced analogue
interconnections between audio sources and the
IndustryAmp should always be used wherever possible. If
driving from an unbalanced source, use the same wiring
as shown above at the amplifier end, but connect the ‘hot’
core to the signal output and the ‘cold’ core to the ground
terminal of that output; the cable’s own screen should be
connected at the amplifier end only.
Amplifier outputs
The amplifier outputs are on 3-pin 7.62 mm-pitch
screw terminal connectors. The secondary winding of
each channel’s 100 V-line output transformer has an
intermediate tapping for use with 70 V-line systems, and
this is available at the same connector. Wire the output
connectors as shown below:












fig.3: Amplifier Outputs

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CobraNet®interface
NOTE: These connectors are only present on
Models PB-400-CN and PB-800-CN (Part Nos.
590403 and 590803).
Connections to the optional CobraNet®card are made via
RJ-45 connectors. Either Port A or Port B may be used; if a
dual redundant network is employed in the installation,
then use both ports, connecting each to independent
Ethernet switches.
NOTE: The two CobraNet®ports CANNOT be
used to “daisy-chain” the Ethernet connection
between multiple amplifiers. Every CobraNet port in use,
on each amplifier of a system, should be connected to its
own port on one or more Ethernet switches.
NOTE: The CobraNet®ports do not auto-select
between “straight” and “crossed” cables.
Standard “straight” cables should be used throughout an
installation which include Ethernet switches, but if
connecting the IndustryAmp directly to a PC (i.e., for
configuration purposes), a “crossed” cable should be used.
Standard pre-made CAT5 or CAT5-e network cables (see
note hereafter) may be used to connect amplifiers to the
local Ethernet switch(es). However, in many installations,
the network connection from within a rack to an Ethernet
switch will be via structural cabling. In this case, wire
mating RJ-45 plugs (not supplied) as shown below:



fig.4: CobraNet®Connectors
PIN CAT5 CORE
1 White + Orange
2 Orange
3 White + Green
4 Blue
5 White + Blue
6 Green
7 White + Brown
8 Brown
The maximum cable run for reliable operation using CAT-5/
CAT-5e cable is of the order of 100 m. If longer distances
are involved, the use of multimode fibre-optic cable is
recommended. This is generally satisfactory up to 2 km,
but repeaters (or the use of single-mode fibre) can be used
to increase the distance further. A third-party Ethernet-to-
fibre interface will be required in these situations.
The CobraNet®interface adds digital audio I/O and an
alternative control method (to RS-485) to the IndustryAmp.
It provides eight additional audio inputs and eight* audio
outputs, at a sampling rate of 48 kHz and bit depths of 16,
20 or 24 bits.Another CobraNet®-equipped product will be
required elsewhere in the system to transmit and receive
the data. See page 20 for further details.
NOTE: Unscreened CAT-5/CAT-5e UTP cable can
be used, but note that the amplifier may fail to
preserve its high level of surge immunity and as a
consequence, will no longer be compliant with the
standards set out in the EC Statement of Conformity. CAT-
5/CAT-5e twisted pair cable with an overall foil shield
(referred to as FTP or F/UTP) is required for compliancy.
ANS microphone input
The IndustryAmp’s DSP card includes an Autogain
algorithm which adjusts the gain of the amplifier in
response to ambient noise levels. To accomplish this, an
external Ambient Noise Sensing (ANS) microphone**
must be connected to the ANS mic input.
Connection is via a 3-pin 3.81 mm-pitch screw terminal
connector, with the same pinout as the analogue audio
inputs. See “fig.2: Analogue Inputs” on page 12 for
wiring details.
Note that on Models PB-400-CN and PB-800-CN the
post-preamp ANS mic signal may be re-broadcast on two
channels of the CobraNet®interface. This permits an ANS
mic to be monitored at a remote location.
* Amplifiers with early serial numbers have two digital audio outputs (ANS
microphone signal only). Please contact your AXYS Audio distributor if there
is any doubt which model you have.
** A suitable AXYS®microphone (combined with a temperature sensor)
is available as an option – Part No. 97661101 Ambient Mic and
Temperature sensor. Refer to “Ambient temperature sensor” on
page 16 for wiring details.

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CONTROL CONNECTIONS
RS-485 interface
The RS-485 network connection should be wired for
Models PB-400 and PB-800 if remote monitoring and
control are required. Its connection is optional for Models
PB-400-CN and PB-800-CN, as the CobraNet®Serial
Bridge feature makes it possible to control and monitor
the IndustryAmp via EtherNet instead. However, some
CobraNet-based installations may still utilise the RS-485
interface as a secondary backup, or as the control protocol
of choice. AXYS®WinControl software can operate using
either protocol, but control via the CobraNet®Serial
Bridge requires either Cirrus CobraNet Object Tools (COT)
or CobraNet Application Development Tools to be installed
on the computer running WinControl.
The network connection is 5-pin 3.81 mm-pitch screw
terminal connector, and should be wired as shown in the
diagram below:




fig.5: RS-485 Connections
Note that 2-pair, individually-screened cable should be
used for RS-485 connection. The transmit (Tx) and receive
(Rx) balanced data lines must be wired via their own
twisted pairs. CAT-5 type UTP or FTP cable is NOT suitable.
Please refer to the Appendix section of the manual for
cable specifications.
The RS-485 interface permits multiple amplifiers to be
“daisy-chained” in parallel (see diagram below), so that
all units are controlled by the same PC. In such a system,
each amplifier must have its own unique network address;
this is set up via WinControl.
to other devices
unit 3 unit 2 unit 1
host
A
B
Y
Z
DGND
A
B
Y
Z
DGND
A
B
Y
Z
DGND
Y
Z
A
B
DGND
fig.6: RS-485 Network
The maximum cable length over which the network
connection will operate reliably depends on the cable type
and the baud rate used. With good quality cable, a safe
maximum figure is 2000 m. If the distance is significantly
longer than this, a network repeater will be required.
Before connecting multiple devices to the same
network subnet, ensure that their network
addresses do not overlap. Each device should be set to a
unique network address (determined via WinControl).
In some installations, it is normal practice to
disconnect the RS-485 network from the USB-to-
RS-485 converter at the host (computer) during normal
operation. This removes the possibility of extraneous data
being inadvertently transmitted over the network. In such
a situation, the converter is only reconnected when system
maintenance or checks are required. Disconnecting from
the convertor in this way leaves the Rx lines of the devices
unterminated. In most situations this does not present any
problems, but with a large network in a hostile EMC
environment, it is recommended that the host Y and Z lines
(host Tx/device Rx) are terminated in a 100 ohm resistor
for normal operation. This can be easily achieved by
plugging the XLR5 F connector into a spare male connector
with the resistor on the appropriate pins. This termination
can then be removed and the convertor reconnected when

AXYS®IndustryAmp User Manual rev 2.2
201605/IAMP_2.2 15
necessary. (If there is any doubt about which pins should
be terminated, shorting all five pins will generally be
equally effective.)
Failure relay
The IndustryAmp includes a single-pole changeover relay
whose contacts are accessible on a 3-pole 3.81 mm-pitch
screw terminal connector. The conditions under which
the relay operates are defined as part of the amplifier
configuration in WinControl.
The relay connections may be configured either as volt-
free, or with additional internal resistors to allow them
to be connected directly to impedance-sensing line
monitoring equipment such as the AXYS®Cerberus*. This
selection is made by moving an internal PCB jumper. See
“fig.7: Failure relay”.
In volt-free operation, CO is connected to NC; a failure
condition causes CO to be connected to NO.
When configured for impedance-sensing use, the
impedance between CO and NC is 10k Ωand open-circuit
between CO and NO in normal operation. When a fault
condition occurs, the impedance between CO and NC rises
to 20k Ω, and CO is short-circuited to NO.
An AXYS®Cerberus or other impedance-sensing fault
monitoring equipment may be connected to CO and NC.
The contact wiring arrangement is shown in“fig.7: Failure relay”.
The relay contacts have maximum current and voltage
ratings of 100 mA and 24 V respectively.

















fig.7: Failure relay
Configuration Jumper Notes
Volt-free Towards rear Factory default
Impedance-sensing Towards front -
*Amplifiers with early serial numbers do not have the option of re-configuring the volt-free relay contacts for impedance-sensing operation.
Please contact your AXYS®Audio distributor if there is any doubt which model you have.

AXYS®IndustryAmp User Manual rev 2.2
201605/IAMP_2.2
16
Ambient temperature sensor
The IndustryAmp is equipped with a frost protection
system which can internally generate a low-level tone if
the ambient temperature drops below a pre-determined
threshold. This produces current in the loudspeaker voice
coils, warming the drivers slightly.
If this function is required,an external ambient temperature
sensor (available as an option – see below) should be wired
to the 2-pin 3.81 mm-pitch screw terminal NTC (Negative
Temperature Coefficient) connector using screened two-
core cable. Connect the ‘+’ terminal of the sensor to the
‘+’ pin of the NTC connector, and both the ‘-‘ terminal of
the sensor and the screen of the cable to the pin of the
NTC connector marked with an earth (ground) symbol .
A suitable AXYS®temperature sensor (combined with
an ANS microphone) is available as an option (Part No.
97661101 Ambient Mic and Temperature sensor). This
should be wired using twin twisted-pair cable with an
overall screen. Use one pair for the microphone and the
other for the temperature sensor. Connect ‘ntc’ on the
sensor to ‘+’ on the NTC connector and ‘AGND’ on the
sensor to the NTC connector pin marked with an earth
(ground) symbol . Connect the microphone pair to the
‘+’ and ‘-‘ pins of the Ambient Microphone input. The
cable’s overall screen should be connected to the pin
of the Ambient Microphone input marked with an earth
(ground) symbol .

AXYS®IndustryAmp User Manual rev 2.2
201605/IAMP_2.2 17
DSP SECTION OVERVIEW
TheIndustryAmpincorporatesa32-bitfloatingpointDigitalSignalProcessor(DSP)inconjunction with24-bit128x-oversampling
A-D and D-A conversion. This permits a very extensive range of system parameters to be controlled remotely and for internal
storage of unit configuration.
1 2 3 8
VOLUMEDELAY AUTO
GAIN
OPTIONAL
EXTERNAL
MICROPHONE
EQ
8 band
parametric
DELAY GAIN
&
POLARITY
4 5 6 7
To Amplifiers
To CobraNet®
Outputs
INPUT 1 INPUT 2 INPUT 3 INPUT 4 INPUT 5 INPUT 6 INPUT 7 INPUT 8 INPUT 9
INPUT 10
ANALOGUEDIGITAL - via CobraNet®
Priority Switching
4 band
parametric GAINDELAY EQ
4 band
parametric
EQ
Cobra xmt 1 Cobra xmt 2 Cobra xmt 3 Cobra xmt 4 Cobra xmt 5 Cobra xmt 6 Cobra xmt 7 Cobra xmt 8
Cobra xmt 6
Cobra xmt 5
Cobra xmt 2
Cobra xmt 1
Cobra xmt 3 Cobra xmt 4
Cobra xmt 7 Cobra xmt 8
PB-400-CN and PB-800-CN only
PB-800 and PB-800-CN only
fig.8: DSP block diagram

AXYS®IndustryAmp User Manual rev 2.2
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18
All DSP functions are adjusted using the WinControl
software application. Detailed information on the use of
WinControl is beyond the scope of this manual, and users
should consult the WinControl Help files.
Level controls
The gain of each analogue input and each digital input
(Models PB-400-CN and PB-800-CN only) may be adjusted
independently over the range -70 dB to +10 dB. Nominal
input level with 0 dB gain is 0 dBV, and the maximum input
level is +19 dBV (peak).
The output level of each amplifier channel can also be set
independently, with a range of 80 dB.
Note that after the inputs have been summed, there is
also a master level control (“Volume”), which provides a
single-point adjustment of the output levels of all amplifier
channels.
Polarity (phase) inversion is also available for each input
and output.
EQ adjustment
The DSP section provides very comprehensive signal
equalisation for both inputs and outputs. Each analogue input,
each digital input (Models PB-400-CN and PB-800-CN only),
and each amplifier channel has its own 4-band parametric
equaliser. These provide up to 25 dB of cut or boost per band
(depending on filter type selected) over the range 10 Hz to 24
kHz, with per-band selection of filter type.
Output equalisation can be used to construct crossover
filtering to allow the IndustryAmps to be used with multi-
way loudspeaker systems. Input equalisation permits
tailoring of individual input signals for optimum clarity.
In addition to individual input and output equalisation,
there is an overall 8-band parametric equaliser in the main
volume control stage, which affects all inputs and outputs.
Each band has the same characteristic as those of the
input and output equalisers.
Delay
Delay may be inserted in any or all of three locations in the
audio signal chain.
Each output channel may have up to 43.6 s of delay*.
Additionally an overall unit delay of up to 21.8 s may be
inserted at the main volume control stage. Furthermore
each analogue input may have up to 10.7 s of delay (PB-
400 and PB-800), for the models equipped with CobraNet®
(PB-400-CN and PB-800-CN) this maximum input delay is
restricted to 1.3 s.
Please refer to individual product datasheets for full data
on the IndustryAmp’s delay capabilities.
Autogain
The DSP section includes an autogain algorithm which can be
set to automatically adjust the overall volume level according
to the ambient noise level detected by a microphone
connected at the ANS mic input. The algorithm measures the
ambient noise in gaps in the programme material being fed
via the IndustryAmp. Once enabled, the amount of additional
gain per dB of ambient noise increase can be controlled, as
well as the threshold at which gain adaption begins.
SURVEILLANCE FUNCTIONS
The IndustryAmp incorporates various surveillance features
to ensure continuous operation in critical applications.
Auto-input switching
Normal configuration of the IndustryAmp is for both
inputs on Models PB-400 and PB-800, and all ten inputs
on Models PB-400-CN and PB-800-CN to be permanently
summed, so that signals on all enabled inputs are always
fed through the system. However, if wished, priorities may
be assigned to individual inputs so that audio through the
system is normally derived from one input only. The inputs
are then monitored, either for presence of pilot tone, or
for a continuous signal level above a pre-determined
threshold. In the event of non-detection of the pilot tone
or input signal, the signal source can be switched to that
on an alternative input.
This arrangement is primarily intended to provide
redundancy; by utilising more than one audio distribution
path, a high degree of system of security can be gained.
*Amplifiers with early serial numbers are equipped with less internal memory, this halves the maximum available delay times.
Please contact your AXYS®Audio distributor if there is any doubt which model you have.

AXYS®IndustryAmp User Manual rev 2.2
201605/IAMP_2.2 19
The Input Mode setting in WinControl (at Input >
Common parameters) allow selection of auto-
switching mode. A brief description of each mode follows;
see the WinControl Help files for full details.
Normal
Auto-switching is disabled. All inputs are active, and
summed. Use this mode if only one input is in use.
Level-controlled priority switching
When enabled, the inputs will switch when the signal level
at the detection point drops below -60 dBFS (default value),
but this threshold may be set to any level between -80
dBFS and -20 dBFS. The detection point is post-processing,
in order that filtering may be applied to remove specific
frequencies or bands. When using analogue inputs, the
relationship between dBFS and dBV’s measured at the
amplifier’s inputs should be taken into consideration;
WinControl’s Help files give full details.
It is also possible to set a Hold Time, so that unwanted
switching does not occur between natural gaps in the
programme.
Pilot tone-controlled priority switching
It is common practice in critical audio systems to
permanently route a low level, high-frequency tone
through the system. The presence of this pilot tone can
then be detected by various items of equipment to verify
the continued operation of the audio paths. Set Input
Mode to Pilot tone-controlled priority switching to enable
this mode.
The IndustryAmp’s pilot tone detector on the analogue
inputs operates in the frequency range of approximately 20
kHz to 28 kHz. The detector is most sensitive in the center
of this frequency range, the detection threshold is not
software configurable. On the digital (CobraNet®) inputs
on Models PB-400-CN and PB-800-CN, the frequency
range is 19.2 kHz to 23.5 kHz and the threshold may be
set between -10 dBFS and -60 dBFS.
The amplifier’s action on non-detection of a pilot tone can
be configured via WinControl. A fault condition can be
“flagged”, and/or the input can be set auto-switch to that
with the next priority.
A notch filter should be inserted to suppress the
pilot tone if its frequency is less than half the
internal processor’s sample frequency (Fs/2, approximately
24 kHz). If the pilot tone is not sufficiently suppressed,
signal detection (and other functions such as frost
protection and Autogain) will not function properly.
Further, this may result in excessive dissipation in the
power amplifiers and/or connected loudspeakers, or
interference with the internally-generated tone used for load
monitoring. Pilot tone frequencies above Fs/2 are sufficiently
suppressed by the anti-aliasing filter of theADC. On CobraNet®
equipped models, any pilot tone frequency received via the digital
inputs must always be < Fs/2.
Failure relay
The single-pole changeover failure relay may be wired to a
‘common fault’ or other external fault monitoring system
so that any fault condition detected by the IndustryAmp
is immediately reported. The conditions which cause
activation of the failure relay may be defined inWinControl,
and may include any or all of: DSP/amplifier/CobraNet®
board faults, load monitoring, internal temperature
sensing, fan operation, pilot tone detection, etc. See the
WinControl Help files for full details.
If it is required to interface the IndustryAmp to impedance-
sensing fault-monitoring equipment such as the AXYS®
Cerberus, the failure relay contacts may be re-configured
by moving an internal jumper. See “fig.7: Failure relay” on
page 15 for connection details.
PRESETS
In addition to retaining all current parameters and settings
in non-volatile memory so that the amplifier resumes
the same operational status after a power failure, the
IndustryAmp also has seven further internal memories
(Presets), each of which may contain an alternative unit
configuration. These Presets are normally accessed via
WinControl, but any third-party control system capable
of transmitting the correct commands via RS-485 (e.g.
Crestron, AMX, etc.) may also be used.
One of the Presets may be assigned as an Emergency

AXYS®IndustryAmp User Manual rev 2.2
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20
Preset, and automatically loaded in the event of loss
of network communication. In the case of CobraNet®
equipped models in life-safety systems, it is generally
advisable to provide an analogue backup audio feed and
configure the amplifier to switch to a Preset including this
in the event of a network failure. See the WinControl Help
files for full details.
COBRANET®CONFIGURATION
The CobraNet®card fitted to Models PB-400-CN and PB-
800-CN is self-organising and requires no adjustments.
However for configuring systems with multiples of PB-
400-CN/PB-800-CN units, each amplifier must have been
assigned a unique IP address. This, as well as the audio
routing, is defined using Cirrus Logic’s CobraNet Discovery
software application. For systems that incorporate one or
more AXYS®WinControl Server PCs for system management,
this application will be pre-installed on each computer.
This topic is beyond the scope of this manual, and further
information can be found in the documentation related to
the WinControl Server configuration.
DSP BYPASS
The IndustryAmp’s DSP system is continually monitored for
correct operation, and in the event of failure, both analogue
inputs are connected directly to the inputs of all amplifier
power stages.This failsafe bypass ensures that the primary
audio inputs always feed the loudspeaker system, even in
the event of a major failure. The conditions for bypass are
configurable from WinControl Service version. By default,
a ‘DSP not running’ condition triggers the bypass action.
As with all other internally-monitored amplifier functions,
a DSP failure is reported to the WinControl server via RS-
485 or the CobraNet®Serial Bridge, as well as triggering
the external failure relay (if configured to do so).
LOAD MONITORING
The amplifier channels are equipped with current-
sensing load monitoring. This operates in the ultrasonic
range, at 22 kHz.
For correct operation, the system must be calibrated
with the normal loads connected to each amplifier
channel to establish a reference load current. After
calibration, any partial or total failure of any of the
loads (or cabling) will be registered as a deviation of
load current from the reference level. Load monitoring
enabling and calibration is carried out using WinControl
(Parameters > Initialization registers
> Miscellaneous-1). Failure of a load monitoring
test may be set to trigger the failure relay, if wished. See
the WinControl Help Files for further information.
AMPLIFIER PROTECTION
Surge protection
Each channel of the power amplifier stage is equipped
with gas discharge surge protection devices connected
between each output terminal (100 V, 70 V and 0 V) and
ground These are designed to withstand high-energy
voltage spikes of up to 4 kV to protect the amplifier output
devices from damage. The amplifier output stages also
incorporate clamping diodes to provide protection from
lower amplitude voltage spikes.
Power-on delay
When the IndustryAmp is powered-up, the amplifier output
terminals are disconnected from the amplifier power
stages themselves by internal relays for a short period, to
allow the internal voltage rails to stabilise and prevent any
unwanted surges from damaging the loudspeakers.
You will hear a click a few seconds after turning the
amplifier on and the front panel Status LED will go from
red to green; this is normal operation.