d & b audiotechnik E-PAC User manual

E-PAC
Power Amplifier Controller
Hardware manual
(1.0E)

General Information
E-PAC Power Amplifier Controller
Hardware manual
Version 1.0E, 09/2003, 2014.E.01
© by d&b audiotechnik AG 2003; all rights reserved.
The information contained in this manual has been carefully
checked for accuracy, at the time of going to press, however no
guarantee is given with respect to the correctness.
d&b audiotechnik AG accepts no responsibility for any errors or
inaccuracies that may appear in this manual or the products and
software described in it.
Technical specifications, dimensions, weights and properties do not
represent guaranteed qualities.
As manufacterers we reserve the right to make alterations and
modifications within the framework of legal provisions, as well as
changes aimed at improving quality.
d&b audiotechnik AG
Eugen-Adolff-Strasse 134, -71522 Backnang, Germany
Telephone [phone], Fax [phone]
E-mail: [email protected], Internet: www.dbaudio.com
References in t e manual
WARNING!
T is refers to a potentially dangerous situation
w ic may lead to personal injury.
CAUTION!
T is refers to a potentially dangerous situation
w ic may lead to damage to t e equipment.
IMPORTANT!
T is refers to a situation w ic may cause t e
equipment to malfunction.
Symbols on t e equipment
Please refer to t e information in t e operating
manual.
WARNING!
Dangerous voltage!

E-PAC, Hardware manual (1.0E) Contents-1
Contents
Safety precautions .....................................................4
Information regarding use of the E-PAC..............................................4
1. Introduction ...........................................................6
1.1. E-PAC based systems.......................................................................7
1.2. E-PAC block diagram ......................................................................7
2. E-PAC Power amplifier controller ..........................8
2.1. igital signal processing .................................................................8
2.2. E-PAC power amplifier....................................................................9
2.3. Power supply ....................................................................................9
2.4. Protective circuits..............................................................................9
2.5. Cooling ............................................................................................10
2.6. Remote control ...............................................................................11
3. Controls and indicators....................................... 12
3.1. Controls ...........................................................................................12
3.1.1. Mains power switch [1].......................................................12
3.1.2. MUTE/POWER switch (green LE ) [2] .............................12
3.1.3. LEVEL/PUSH MENU ( igital rotary encoder) [3]............13
3.2. Indicators.........................................................................................13
3.2.1. LC isplay [4] ......................................................................13
3.2.2. ISP LE - Input Signal Present (green) [5] ........................13
3.2.3. GR LE - Gain Reduction (yellow) [6] ..............................13
3.2.4. OVL LE - Overload (red) [7]...........................................14
4. Connections ......................................................... 15
4.1. Mains power connection and fuse protection ...........................15
4.1.1. Mains power connection [8] ..............................................15
4.1.2. Fuse protection [9] ..............................................................15
4.2. I/O Connectors ..............................................................................16
4.2.1. INPUT [12] and INPUT LINK [13] ......................................16
4.2.2. MIX IN [14] ..........................................................................16
4.2.3. SPEAKER OUT [15]..............................................................16
4.3. Remote interfaces...........................................................................17
4.3.1. REMOTE [10] .......................................................................17
4.3.2. SERVICE [11] ........................................................................17
5. Tec nical documentation .................................... 18
5.1. Technical specifications..................................................................18
5.2. Power consumption and power loss ............................................20
5.3. E-PAC operation ............................................................................21
5.3.1. Installation ............................................................................21
5.3.2. E-PAC Rack mount kits........................................................22
5.4. Technical drawings.........................................................................23
6. EU declaration of conformity (CE symbol) ........... 24

E-PAC, Hardware manual (1.0E)
Safety precautions-1
Safety precautions
Before you use our products, read t e manual
carefully and observe all t e safety precautions.
T ey will protect you and elp to avoid equipment
failures.
Keep t is manual in a safe place so t at it is
available for future reference.
If you supply d&b products, please draw t e
attention of your customers to t ese safety
guidelines. Enclose t e relevant manuals wit t e
systems. If you require additional manuals for t is
purpose, you can order t em from d&b (see section 1
Introduction).
Information regarding use of t e E-PAC
WARNING!
T e following information is intended to prevent
fires and possible electric s ocks:
The E-PAC is a protective class 1 unit. Make sure that the earth
(ground) contact is attached when the unit is in operation. A
missing earth (ground) contact may lead to dangerous voltages in
the housing and controls.
To reduce the possibility of audible hum the units signal ground
(XLR pin 1) to earth (ground) connection has a high impedance. It
will prevent the unit from static charge but any voltage applied to
signal ground will pass through all connectors. To prevent electric
shock, make sure that all devices in the signal path are grounded
properly.
Never connect an amplifier output pin to any other in or output
connector pin or earth (ground). This might damage the unit or
lead to electric shock.
Lay all cables connected to the unit in a way that they cannot be
crushed by vehicles or other equipment and that no one can step
on them.
Keep dust, moisture, water or other liquids well away from the unit.
Never operate the unit when it is open.
Always disconnect the mains power supply when replacing a
defective fuse. Only use the type of fuse listed in the specifications.
Only carry out work specified in this manual and always disconnect
the mains power supply.
All other work should be performed by trained service staff,
especially in the following cases:
- Mains power cable, socket or plug has been damaged
- Objects or liquids have entered the unit
- The unit is not operating normally
- The unit was dropped or the housing is damaged

E-PAC, Hardware manual (1.0E) Page 5 of 24
E-PAC, Hardware manual (1.0E)
Safety precautions-2
CAUTION!
The device complies with the electromagnetic compatibility
requirements of EN 55103 (product family standard for audio,
video, audio-visual and entertainment lighting control apparatus
for professional use) for the environments E1 (residential), E2
(business and commercial), E3 ( outdoor use in urban areas) and E4
(outdoor use in rural areas).
Acoustic interference and malfunctions may occur if the unit is
operated in the immediate vicinity of high-frequency transmitters
(e.g. wireless microphones, mobile phones, etc.). amage to the
mainframe is unlikely, but cannot be excluded.
To meet the EMC requirements, use only shielded cables with
properly connected plugs for all signal terminals (INPUT, INPUT
LINK, MIX IN).

E-PAC, Hardware manual (1.0E) Page 6 of 24
1. Introduction
This manual describes the facilities and functions of the hardware
of the d&b E-PAC Power amplifier controller. A detailed description
of the E-PAC Software and remote control is given in the E-PAC
Software manual, which is also provided with the E-PAC.
A number of publications with supplementary information on our
products are available from the ocumentation section of our
website at www.dbaudio.com. You can either download these
directly or use the online order form to request a printed version.
If the document you want is not detailed on the form please enter
the title in the box after entering your address information.

E-PAC, Hardware manual (1.0E) Page 7 of 24
1.2. E-PAC based systems
The E-PAC Power amplifier controller is a single channel amplifier
with an internal controller for operating C, CI E and Q-Series,
MAX/MAX12 loudspeakers.
The controller incorporated in the E-PAC is based on a igital
Signal Processor, SP, utilising sigma-delta signal conversion.
All operational states of the E-PAC as well as the pre-programmed
system settings and configurations for d&b C, CI- E and Q-Series
loudspeakers are controlled with a front panel digital rotary
encoder in conjunction with the Liquid Crystal isplay (LC ). The
E-PAC has an additional linear configuration for MAX and MAX12
loudspeakers.
The E-PAC is specifically designed for high impedance loads
(200 W into 16 ohms, 300 W into 8 ohms).
If low impedance (LO IMP) mode is selected the E-PAC can drive
up to two 8 ohm or four 16 ohm loudspeakers, at reduced output
(–6 dB). This is useful for situations such as front fill or under
balcony use where multiple loudspeakers are needed but maximum
output is not required.
All the functions of the E-PAC, including programmable internal
delay settings, can be remotely interrogated and altered via the
RIB, Remote Interface Bridge and a PC.
1.3. E-PAC block diagram
Service
Remote
Link
Input
Mix In
Input
Amplifier ADC DSP DAC Power Amplifier
Output
µController
Error DetectionDisplay & Controls
Impedance Data
1+/1–
2+/2–
E-PAC block diagram

E-PAC, Hardware manual (1.0E) Page 8 of 24
2. E-PAC Power amplifier controller
The E-PAC incorporates a power supply, single channel power
amplifier, igital Signal Processor ( SP), all necessary protection
circuits, a remote interface, controls and indicators.
The E-PAC is housed in a 2RU high, rugged enclosure and can be
operated as a stand alone unit. Optional accessories allow
single a E-PAC to be installed in standard 9.5" or 19" equipment
racks or flightcases. A dual rack kit is available for mounting a pair
side-by-side (see Section "Installation") .
2.1. Digital signal processing
The controller incorporated in the E-PAC is based on a igital
Signal Processor, SP, utilising sigma-delta signal conversion.
The signal processing includes correction of the frequency
response, a high pass filter, limiting and complex protection circuits
that model loudspeaker cone displacement and voice coil
temperature.
elay settings up to 220 ms (= 75.68 m/246.1 ft) can be
programmed into the controller using the LEVEL/PUSH MENU
(digital rotary encoder) in conjunction with the LC .
IMPORTANT!
System configurations are specific to the characteristics of each
loudspeaker and affect the frequency response and maximum
output level. To ensure optimum performance and prevent damage
to system components each type of loudspeaker has to be used in
conjunction with a suitably configured E-PAC.
The E-PAC digital signal processing circuits introduce a processing
delay of 1 ms into the signal path, equivalent to a sound path
length of 34 cm (1.12 ft). If two identical loudspeakers are driven
by digital (E-PAC) and analogue (P1200A) controllers respectively,
the 1 ms delay of the E-PAC effectively positions its respective
loudspeaker at a distance of 34 cm (1.12 ft) behind the
loudspeaker driven by the P1200A. Where the two loudspeakers
form an array this will lead to an increase in comb filtering and
unpredictable coverage patterns. If the distance between the
cabinets is much greater than the path difference of 34 cm (1.12
ft), this effect becomes negligible.
Please note that all digital signal processing equipment used in the
signal path will delay the signal. For example digital equalizers
have a typical processing delay of about 3 ms.
DSP
elay Sine-wave
generator
Pink-noise
generator
Loudspeaker
System
equalization
Equalizer
function
(PEQ/Notch)
Limiters:
Peak
isplacment
Thermal
ACA C
Block diagram DSP software (signal c ain)

E-PAC, Hardware manual (1.0E) Page 9 of 24
2.2. E-PAC power amplifier
The single channel power amplifier of the E-PAC maintains high
linearity throughout it’s operational range even into adverse loads.
With fast response to, and recovery from overload conditions,
stability and accurate performance is guaranteed. A two stage
power supply keeps the losses through heat emission low. To
maintain sound quality, a limiter circuit prevents the amplifier from
continously reaching its maximum output voltage, known as
clipping.
The E-PAC can deliver 200 W continuous sine wave output power
into a 16 ohm load or 300 W into an 8 ohm load. Selecting low
impedance mode enables the E-PAC to deliver an output power of
150 W into 4 ohms. These values apply to continuous operation for
a minimum of 30 minutes at a maximum ambient temperature of
24 C (75 F).
An E-PAC will normally be operated with speech or music
programme, complex signals where the average power
requirement is below peak power. The E-PAC will continue to
operate indefinitely even where the signal has a very low peak to
RMS ratio (Crest factor, see section 2.13. on page 41), provided
the device is installed to enable the heat generated to be
adequately dissipated.
2.3. Power supply
The switched mode mains power supply permits worldwide
application without the need for mains voltage switching or
conversion. Special regulation of the power supply unit additionally
guarantees constant output power with fluctuating mains voltage,
leading to a substantially higher dynamic stability than a
conventional power supply unit of the same performance. This
benefits the reproduction of music or speech with a wide dynamic
range.
Active Power Factor Correction (PFC) is characterised by the
current drawn being represented by an almost sinusoidal
waveform, resulting in lower loss, in contrast to the pulse shaped
current characteristic of power supplies without PFC. This is an
advantage where long mains power supply cables are used.
The mains voltage and power consumption are recorded by the
power supply and can be viewed on the LC display.
2.4. Protective circuits
The E-PAC contains many integrated protective functions:
If over temperature occurs, the device switches to mute. After it has
cooled down, the output stage resets automatically.
The output current limiter (SOA watchdog) prevents damage to the
output stage that could occur from a short-circuit or incorrect
cabling, while passing the short current peaks drawn by a complex
load like a loudspeaker.
The mains power connection is protected by a fuse.
A mains inrush current limiter provides a 'soft start' and enables
several E-PACs to be powered up at the same time without over-
loading the mains power supply.

E-PAC, Hardware manual (1.0E) Page 10 of 24
The maximum current draw during the power up phase is dependant
on the mains voltage, however nominal values are 2 A (peak) at 230
V and 4 A (peak) at 115 V.
The nominal operating range of the E-PAC is between 85 V and
265 V (100 V –15% /230 V +15 %). Where voltages outside of
this range are present, a self-resetting protective circuit responds
quickly to isolate the internal amplifier power supply leaving only a
supervisory circuit to monitor the mains voltage. The display will
clearly indicate the fault and voltage value, the display illumination
switching off after 10 seconds.
The supervision circuit will operate up to 400 V; this allows the
E-PAC to survive connection across two phases of a three phase
supply.
To prevent the E-PAC from cycling on and off with fluctuating
mains power supply voltages, the switching thresholds are delayed
dependant on the condition breached. These voltage thresholds
and corresponding transition delay times are listed in the table
below.
Main
voltage V
RMS
Condition
from
⇒ to
Delay
276 V ON OFF 1 msec.
267 V OFF ON 2 sec.
83 V OFF ON 2 sec.
77 V ON OFF 20 msec.
To ensure a fast response to irregular mains conditions, the mains
voltage is registered in the E-PAC as an instantanous peak value,
the switching thresholds correlated to that peak value. Peak values
are converted to rms values for display purposes. However a
real-world AC mains power supply is not typically represented by a
perfect sinewave, therefore, the peak-to-rms conversion is based on a
typical sinewave with a flat top at 96% of the amplitude of an ideal
sinewave.
As a consequence, the displayed voltage and the actual
switching thresholds will depend on the shape of the mains voltage
or the quality of the mains power supply, respectively.
2.5. Cooling
The aluminium enclosure acts as a heat sink for the E-PAC power
amplifier; it is therefore convection-cooled. To prolong the life of
components inside the E-PAC, a small fan located at the front of
the E-PAC intakes cooling air through an opening in the rear
panel. The quiet running fan is activated at two temperature
thresholds. One at 30 C (86 F) and a second, whereby the fan will
draw air at a faster flow rate, at above 45 C (113 F).
WARNING!
o not touch the heat sink. uring operation the cooling fins of the
heat sink on the enclosure of the E-PAC can reach temperatures of
80 C (176 F). The front and rear panels do not form part of the
heat sink and can be touched at any time.

E-PAC, Hardware manual (1.0E) Page 11 of 24
IMPORTANT!
When operating and installing the E-PAC, make sure enough air
can flow around the enclosure. Never cover or block the intake
opening on the rear panel or the exit opening on the front panel.
Also refer to Section 'Installation'.
2.6. Remote control
The REMOTE sockets can be used with either the dbCAN (CAN-
Bus) interface or with a serial interface to the d&b Remote
Interface Bridge (RIB) to integrate the E-PAC into a control and
monitoring system.
A detailed description of remote control via dbCAN (CAN-Bus) is
given in the technical information TI312 (d&b code 5312.E.)
A detailed description of remote control with the d&b RIB is given
in the RIB user manual (d&b code 2903.E).

E-PAC, Hardware manual (1.0E) Page 12 of 24
3. Controls and indi ators
OVLGRISP
LEVEL
PUSH MENU
MUTE
POWER
2
3
4
5
[4] [3] [2] [5][6][7] [1]
E-PAC Controls and indi ators
3.1. Controls
3.1.1. Mains power swit h [1]
[1]
E-PAC Mains power swit h
The on/off switch is located on the rear panel and isolates the
mains power supply to the E-PAC. The MUTE/POWE switch [2]
on the front panel has the functions ON/MUTE/STANDBY and
does not isolate the E-PAC from the mains power supply.
− off: the E-PAC is isolated from the mains power supply except
the overvoltage protection circuit. The power consumption is
very low (2 W typical).
− on: the E-PAC is switched on. Via remote or the MUTE control
the E-PAC can be switched to standby mode. To indicate
standby mode the display remains active.
3.1.2. MUTE/POWER swit h (green LED) [2]
OVLGRISP
LEVEL
PUSH MENU
MUTE
POWER
2
3
4
5
[3] [2]
E-PAC Controls
When the rear panel mains power switch is set to the on position,
the combined MUTE/POWE switch can be used to place the
E-PAC either in mute or standby mode. The switch incorporates a
green LED indicator which indicates three different states - ON,
MUTE and STANDBY.
− LED on » ON (unmuted) : the E-PAC is powered on and
ready for use. A brief press of the MUTE/POWE switch will
mute the E-PAC, a longer press places the E-PAC in standby
mode.
− LED regular flashing (1:1 duty cycle): » MUTE :
the E-PAC is muted. In the mute state, the input signal is muted
but the power amp is still powered and connected to the
speaker output. The E-PAC is unmuted by briefly pressing the
MUTE/POWE switch. A longer press of the MUTE/POWE
switch will place the E-PAC in standby mode.
− Regular short flashes (1:8 duty cycle): » STANDBY :
in standby mode the loudspeaker output is electronically
isolated and the E-PAC idles, drawing minimal mains power.
Only the most essential functions are provided. Display and
network remain functional, the display illumination is switched
off after 10 seconds. Pressing the MUTE/POWE switch powers
on the E-PAC ready for use. The E-PAC may also be powered
back on by remote control from standby mode.

E-PAC, Hardware manual (1.0E) Page 13 of 24
IMPORTANT!
When the E-PAC is set to STANDBY (or the mains power is turned
off) the movement of the loudspeaker cones in the cabinets
connected is no longer damped by the power amplifier output. This
removal of the damping makes them susceptible to excitation by
other loudspeakers in the surroundings. Audible resonances may
occur, and even absorption of low frequency sound energy as the
undamped loudspeakers act like a 'bass trap'. To permanently
mute single subwoofer cabinets it is therefore preferable to use the
MUTE function instead of STANDBY. The STANDBY mode,
however, can be of advantage with mid-high systems, because it
will remove any residual noise from the system.
The MUTE/POWE switch is a 'soft' switch which doesn’t
electrically isolate the E-PAC from the mains supply. The E-PAC
circuitry can be electrically isolated from the mains supply by
switching the rear panel mains power switch to its off position.
The setting of the MUTE/POWE switch is stored in the E-PAC
when the mains power is turned off or disconnected. After
reconnecting the E-PAC it will revert to the same status as before
disconnection.
3.1.3. LEVEL/PUSH MENU (Digital rotary en oder) [3]
Operation, configuration and status viewing of the E-PAC are all
accessed via the front panel digital rotary encoder; LEVEL/PUSH
MENU. In the main menu the encoder acts as a level control.
Pushing or turning the encoder gives access to different menu
levels or enables configurations or values to be entered.
− Brief press: access to the menu level.
A detailed description of the menu structure and access is given in
the E-PAC Software manual, which is also provided with the E-PAC.
3.2. Indi ators
3.2.1. LC Display [4]
OVLGRISP
[4] [5][6][7]
E-PAC Indi ators in detail
Serves as a user interface and display for all configuration settings
and status information.
The display is illuminated and can be set to "on/off/timeout 10s."
A detailed description of the menu structure and access is given in
the E-PAC Software manual, which is also provided with the E-PAC.
3.2.2. ISP LED - Input Signal Present (green) [5]
− Illuminates when the E-PAC input signal exceeds –30 dBu.
The ISP indication is unaffected by the setting of the level
control and the MUTE function but will not operate in STANDBY
mode.
3.2.3. GR LED - Gain Redu tion (yellow) [6]
− Illuminates depending on the input signal: the
E-PAC limiter circuit reduces gain by more than 3 dB. This state
is not critical but shows that the system has reached its limits.

E-PAC, Hardware manual (1.0E) Page 14 of 24
3.2.4. OVL LED - Overload (red) [7]
Illuminates depending on the input signal
:
− While the green ISP-LED is lit » Overload: either the
input signal level is too high or the E-PAC is trying to deliver
too high an output current. If in doubt of the reason reduce the
input gain at the E-PAC level control. If the error message
disappears, the output current has been too high (load
impedance too low caused by to many loudspeakers connected
to the E-PAC output, or a defective cable or connector). If the
condition does not change, the input signal to the E-PAC is too
high (greater than +23.5 dBu).
An overload could also be caused by accumulate the source
input INPUT+MIX IN or by high gain settings (boosts) in the
single EQ bands, while the input signal is lower than +23.5 dBu.
− Flashes (1:1 mark spa e) » Error: an error message will
be displayed.

E-PAC, Hardware manual (1.0E) Page 15 of 24
4. Conne tions
[8]
[9] [15 ] [14 ] [11] [12 ] [10 ] [13 ]
E-PAC Conne tions
4.1. Mains power onne tion and fuse prote tion
4.1.1. Mains power onne tion [8]
WARNING!
Only onne t the E-PAC to mains power supplies with
an earth ondu tor (prote tive earth). Make
absolutely sure that earth is onne ted orre tly.
[8]
[9]
E-PAC Mains power
onne tion
A 3-pin IEC socket with an integrated fuse holder is provided for
connecting the E-PAC to the mains power supply.
A suitable power cable is supplied.
IMPORTANT!
Before connecting the device to mains voltage, check that the
mains voltage and frequency corresponds to the specifications on
the configuration sticker on the rear of the E-PAC.
4.1.2. Fuse prote tion [9]
A replaceable 20 mm fuse located above the 3-pin IEC socket is
integrated in the socket (5 A Time Lag (T)). This is connected in
series to the power supply and fails if the current drain is
exceeded. There is a spare fuse in the fuse holder.
WARNING!
If the fuse has failed dis onne t the E-PAC from the
mains supply before repla ement.
Only use a fuse of the orre t type and nominal
urrent value.
Before restoring power to the E-PAC all cabling should be checked
for faults. If in any doubt disconnect all signal and loudspeaker
connections.

E-PAC, Hardware manual (1.0E) Page 16 of 24
4.2. I/O Conne tors
[15 ] [14 ] [12 ] [13 ]
E-PAC I/O Conne tors
All signal input and output connections are located on the rear
panel. These include analogue signal inputs (INPUT/MIX IN), link
output (LINK) and a NL4 loudspeaker output (SPEAKE OUT).
4.2.1. INPUT [12] and INPUT LINK [13]
Pin assignment E-PAC signal inputs
The E-PAC signal input connector is a 3 pin female XL .
Below and wired in parallel is a 3 pin male XL input link connector
used to feed the input signal on to the next device in the system
signal chain.
4.2.2. MIX IN [14]
A 3 pin female XL connector provides a MIX IN input. A second
signal fed to this input is summed to the main INPUT. If Left and
ight components of a stereo source are fed to the main INPUT
and MIX IN connections then a mono sum signal is derived from
the speaker output. Please note that the resultant output is 3 dB
higher.
The output on the INPUT LINK connector is derived from the signal
fed to the INPUT connector. An additional signal fed to the MIX IN
connector will not appear at the INPUT LINK output.
4.2.3. SPEAKER OUT [15]
E-PAC SPEAKER OUT NL4
The E-PAC is fitted with a single Speakon-NL4 speaker output
connector. With configuration settings which transmit full-range
signal (e.g. E3 or LINEA ) all four pins on the Speakon connector
are driven, pins 1+ and 2+ carry positive signal, 1– and 2– carry
negative signal. With SUB configurations selected pin 1+ is
disconnected automatically. This prevents mid-high cabinets from
accidental damage by subwoofer signal.

E-PAC, Hardware manual (1.0E) Page 17 of 24
4.3. Remote interfa es
[11] [10 ]
E-PAC Remote interfa es
4.3.1. REMOTE [10]
Pin assignment for remote ontrol
(RJ45)
The E-PAC is fitted with a two-wire serial remote control interface,
(2 x J 45) carrying both the IB and CAN-Bus signals. All pins of
both connectors are wired in parallel allowing either to be used as
the input or output. Where remote control networking conforms to
a 'Bus or ing topology' one connector is used for the incoming
signal and the second connector allows for direct connection to
another device or for terminating in case of a CAN-Bus network.
The interface connections for the IB (pin 7/8) are opto-coupled,
while the connections for the CAN-Bus (pin 4/5) are hard wired to
common ground (protective earth).
Pin Signal Remark
1-
2-
3-
4 CAN_H CAN high bus line (active high)
5 CAN_L CAN low bus line (active low)
6-
7 IB Data
8 IB Data
Shield GND CAN Ground
RJ45 pin assignment on d&b devi es
4.3.2. SERVICE [11]
SERVICE onne tor (SUB-D9)
The SUB-D9 SE VICE interface ( S 232) allows operating software
and loudspeaker configuration updates to be loaded into the unit.

E-PAC, Hardware manual (1.0E) Page 18 of 24
5. Te hni al do umentation
5.1. Te hni al spe ifi ations
Displays
ISP.............................................................................Input Signal Present indicator (green)
G ...................................................................................Gain eduction indicator (yellow)
OVL.....................................................................................Overload/Error indicator (red)
MUTE/POWE .....................................................On/Mute/Standby indicator (green)
Liquid Crystal Display (LCD) ........................................................................ 120 x 32 Pixel
Controls
I/O............................................................................................................ Main power switch
MUTE/POWE .........................................................................On/Mute/Standby switch
LEVEL/PUSH MENU.......................................................................Digital rotary encoder
Access to all functions including:
Level control .......................................................–57.5 dB ... +6 dB with 0.5 dB detents
Configurations..............................................................................................Filter_1/Filter_2
4 band equalizer..............................................................................Optional Peak/Notch
Delay setting......................................................1.0 ... 220 msec. with 0.1 msec. detents
System set up......................................................... C, CI E and Q-Series loudspeakers
............................................................................................................linear (MAX/MAX12)
Impedance measurement (Z)..................................................................... 0 to 255 ohms
Protection...................................................Operator input inhibit/password protection
emote control............................................................................................... IB(TI212)/ IB
Device name....................................................................................15 alphanumeric digits
Display illumination...........................................................................Off/On/Timeout 10s
Frequency generator .... alternative sine wave, 10 Hz ... 20 kHz with 1 Hz detents
....................................................................................................................................Pink Noise
...............................................................................–57.5 dB ... +6 dB with 0.5 dB detents
Buzzer...................................................................... Acoustical signal for Error Messages
Impedan e Monitoring a ording to EN 60849/IEC 60849
'Sound Systems for Emergen y Purposes'
Input monitoring ................................................................Detecting external Pilot Signal
Load monitoring ..............................................................................Impedance monitoring
program and/or Pilot Signal at 10 Hz and 20 kHz
Conne tors
INPUT .....................................................................................3 pin XL (female), balanced
INPUT LINK.................................................................3 pin XL (male) parallel to INPUT
MIX IN ..................................................................................3 pin XL (female) balanced
SPEAKE OUT....................................................................................................................NL4
Pin assignments full range speakers.........................................................1+/1–, 2+/2–
Pin assignments active subwoofers....................................................................... 2+ / 2–
EMOTE ......................................................................................................................2 x J45
SE VICE ..............................................................................................................SUB-D9 (PS2)
Prote tion ir uits
Mains inrush current limiter ......................................2 A peak at 230 V, 4 A at 115 V
Overvoltage protection.................................................................................... up to 400 V
Self resetting overtemperature protection ................................................ 75 C /167 F
Output short and open circuit protection...............................................................• 20 A
Speaker switch on delay ............................................................................... approx 2 sec.

E-PAC, Hardware manual (1.0E) Page 19 of 24
Data (linear-setting with subsoni filter)
ated output power (THD + N < 0.1%)...............................1 x 200 W into 16 ohms
...........................................................................................................1 x 300 W into 8 ohms
LO IMP mode.................................................................................1 x 150 W into 4 ohms
Frequency response (–1 dB)..................................................................... 35 Hz – 22 kHz
THD+N (20 – 20k Hz) ...........................................................................................< 0.05 %
IM (SMPTE) .................................................................................................................. < 0.1 %
Slew rate.............................................................................................................. 50 V /
µ sec.
Damping factor (20 – 1k Hz into 16 ohms) ...........................................................> 160
S/N ratio (unweighted, MS, 0 dB).....................................................................> 94 dBr
S/N ratio with MUTE (unweighted)..................................................................> 104 dBr
Input impedance......................................................................................................22 kohms
Input-CM (20 – 1k Hz)........................................................................................... > 50 dB
Maximum input level............................................................................................... +21 dBu
(sum of INPUT and MIX IN)
Digital Signal Pro essing
Sampling rate................................................................................................48 kHz / 24 bit
Basic delay ....................................................................................................................1 msec.
Maximum delay setting ....................................................220 msec. (75.68 m/246.1 ft)
Power onsumption (typi al values)
Standby ..............................................................................................................................2 W
ON, without signal.........................................................................................................27 W
ON, Standard signal* at 16 Ohms...........................................................................79 W
On, Standard signal* at 8 Ohms.............................................................................114 W
* Standard signal: Pink noise, 1/8 nominal power
Dimensions, weight and power supply
Height x width x depth ...........................................................2 U x 190 mm x 331mm
......................................................................................................................2 U x 7.5" x 13"
Weight ...........................................................................................................4.7 kg / 10.4 lb
Universal voltage range switched mode power supply with active power factor
correction (PFC)
Mains voltage rating................................................................85 – 265 V / 50 – 60 Hz
Mains fuse.......................................................................................................5A Time lag (T)

E-PAC, Hardware manual (1.0E) Page 20 of 24
5.2. Power consump ion and power loss
The power required from the mains supply and the waste heat
produced by the amplifiers power loss are variable figures
depending on the load impedance and the signal levels and
characteristics (e.g. speech, music).
In practice, the theoretical peak power consumption of a system
will only be sustained for a short period of time. Basing mains
current and air conditioning plant requirements on the peak power
consumption of the sound system would result in a generously
over specified installation. The key factor in power consumption
calculations is the crest factor of the signal the ratio of peak to
sustainable RMS voltage of the signal.
Power input and electrical (
⇒ thermal) power loss for different
signal and load conditions can be derived from the graphs shown
below.
196
80
50
300
120
78
--
159
60 34
102
86
47
156
125
85
123
118
79
1.4 2.8 3.5 1.4 2.8 3.5 1.4 2.8 3.5
0
100
200
300
400
500
Crestfactor 4 ohms (LO IMP)8 ohms
16 ohms
power [W]
loss
output
Maximum ou pu power and power loss of E-PAC for differen
signal charac eris ics (Cres fac ors) a full level.
5 10 100 200
30
100
400
consumption
loss
power [ W]
average output power [W]
5 10 100 200
30
100
400
consumption
loss
power [ W]
average output power [W]
Power consump ion and loss of E-PAC as a fac or of ou pu
power (W
RMS
in o 8 ohms) wi h pink noise signal
Average power consump ion and loss of E-PAC as a fac or
of ou pu power (W
RMS
in o 16 ohms) wi h pink noise signal