A & E Specifications

Overview: Channel Modes and Network
The power amplier shall provide four discrete channels of
amplication. Rear-panel switches shall enable bridging of adjacent
channels to allow reconguration as a 2- or 3-channel amplier, with
increased power output available through the bridged channels.
Each channel (discrete or bridged) shall be capable of independently
driving either low impedanceor high impedance (70 Vrms /100 V
peak) loads. The amplier shall employ a proprietary tracking Class
D output circuit topology. The amplier shall be equipped with sen-
sing and communication circuits to allow comprehensive remote
control and monitoring functions via a separate network bridge. The
proprietary control and monitoring network shall employ TCP/IP
protocols, use Cat-5 cable for interconnection, and allow remote con-
trol from either the network bridge front-panel or from an external PC
using proprietary software.
Power Output and Performance
Maximum total output of all four channels shall be 2800 watts. In dis-
crete four-channel mode, each amplier channel shall deliver maxi-
mum continuous output power as follows: 600 watts into 16 ohms,
700 watts into 8 ohms; 700 watts into 4 ohms; 300 watts into 2
ohms; or 700 watts into a high impedance (70 Vrms /100 V peak) load.
Maximum output voltage per channel shall be 100 Vrms; maximum
output current per channel shall be 12 Arms. In bridged mode, each
bridged channel shall deliver maximum continuous output power
as follows: 1400 watts into 16 ohms; 1200 watts into 8 ohms; 600
watts into 4 ohms; or 1400 watts into a high impedance (140 Vrms
/ 200 V peak) load.
Default amplier gain shall be 35 dB, with rear-panel adjustment
from 23 - 44 dB in 3 dB increments, selectable for each channel. For
bridged channels, the amplier shall automatically compensate –6
dB gain internally to maintain operation of all channels at selected
gain.
The amplier shall exhibit the following performance parameters
with gain set at 35 dB and VPL (Voltage Peak Limiter) at 141 V:
Frequency response shall be 6.8 Hz to 34 kHz, +0/-3 dB at 1 watt
into an 8 ohm load; channel separation shall be greater than 70 dB;
and signal-to-noise ratio shall be 112 dBA. THD at 1 watt, 20 Hz – 20
kHz, shall be less than 0.1%; THD at 1 kHz shall be no more than
0.05% at 1 dB below clipping.
A voltage peak limiter shall limit peak output as determined by rear-
panel switches. In discrete four channel mode, peak voltage shall be
selectable in eights steps across a range of 141 V to 42 V. In bridged
mode, peak voltage shall be selectable in eight steps from 282 V to
84 V. The voltage limiter mode shall be selectable for either hard or
soft limiting characteristics.
Connectors, Controls, and Indicators
The following connectors and controls shall be provided on the
REAR-PANEL of the amplier. The four input connectors shall be
electronically balanced, 3-pin Phoenix connectors. The four output
connectors shall be 2-pole barrier strip screw connectors. A group
of seven DIP-switches shall determine the following: Amplier gain
(23 dB to 44 dB in 3 dB increments); option active; fan masked;
and bridged mode selection for channel pairs. A group of sixteen
DIP-switches shall determine Voltage Peak Limiter values for each
channel, selectable in eight steps, and Hard or Soft limiting char-
acteristic. Two RJ45 connectors shall be provided for input and
output of the control/monitoring network signals. An LED adjacent
to the RJ45 connectors shall indicate active or inactive status of the
network.
The following indicators and controls shall be provided on the
FRONT-PANEL of the amplier. Four level control potentiometers,
one for each channel, shall be provided beneath a front-panel secu-
rity cover; potentiometers shall be detented and provide attenuation
from 0 dB to minus innity in 21 steps. Individual switches shall be
provided for power on/off and remote power on/off enabling. Front-
panel LED indicators shall be provided to show status of power on/
off (green), network connection (blue), Power Average Limiter (red),
and option card active (yellow). Additional LED indicators shall be
provided to show the status of the following for each channel: signal
present and high-impedance warning (green/red), signal present at
–10 dB and –4 dB (2 x green), voltage peak limiter clipping (red),
current peak limiter (CPL) active (orange), very high frequency (VHF)
warning (yellow), high temperature warning (yellow ashing), and
high temperature fault with output muted (yellow constant). Mute
shall be indicated by illumination of both the temperature and VHF
LEDs on a channel; fault shall be indicated by illumination of both the
CPL and VHF LEDs on a channel.
Power Supply, Protection, and Cooling
The power supply shall be a regulated switch mode type. The
amplier shall operate from AC line sources of either 230 V nominal
or 115 V nominal, with operating ranges of 130 – 265 V and 65 – 135
V at line frequencies of 50 Hz or 60 Hz. Minimum power-up voltages
are 171 V (230 V nominal) and 85 V (115 V nominal). A soft start
circuit shall limit current inrush at power-up to 5 A. The amplier
shall be equipped with a PAL™ (Power Average Limiter) circuit to
prevent excessive current draw. The amplier shall be cooled by two
temperature-controlled, variable-speed fans, with air ow from
front-to-back. Adaptive fan on/off function shall be dependent on
presence of an output signal.
Physical
The amplier shall be 483 mm (19 in.) wide, 88 mm (3.5 in. / 2 U)
high, and 343 mm (13.5 in.) deep. The weight shall be 12 kg (26.4
lbs). The cabinet shall be black painted steel with a grey painted steel
front-panel.
The amplier shall be approved for use as specied by CE, ANSI/UL,
ETL and the FCC. The amplier shall be the Lab.gruppen C 28:4.
C 28:4
Architect’s and Engineer’s Specifications
C Series: Dedicated Installation Amplifiers
WWW.LABGRUPPEN.COM
Item no. AES-C284 - 02.12.2015