A & E Specifications

WWW.LABGRUPPEN.COM
Item no. AES-C884 - 02.12.2015
Overview: Channel Modes and Network
The power amplier shall provide four discrete channels of amplica-
tion. Rear panel switches shall enable bridging of adjacent channels
to allow reconguration as a two- or three-channel amplier, with in-
creased power output available through the bridged channels. Each
channel (discrete or bridged) shall be capable of independently driv-
ing either low impedance or high impedance (70 Vrms/100 V peak)
loads. The amplier shall employ a proprietary tracking Class D out-
put circuit topology. The amplier shall be equipped with sensing
and communication circuits to allow comprehensive remote control
and monitoring functions via a separate network bridge. The propri-
etary control and monitoring network shall employ TCP/IP protocols,
use Cat-5 cable for interconnection, and allow remote control 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 8800 watts. In
discrete four-channel mode, each amplier channel shall deliver
maximum continuous output power as follows: 625 watts into 16
ohms, 1250 watts into 8 ohms; 2100 watts into 4 ohms; 2200 watts
into 2 ohms; or 2200 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 35.5 Arms. In
bridged mode, each bridged channel shall deliver maximum conti-
nuous output power as follows: 2500 watts into 16 ohms; 4200
watts into 8 ohms; or 4600 watts into 4 ohms.
Default amplier gain shall be 35 dB, with rear panel adjustment
from 23 to 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 electro-
nically balanced, 3-pin Phoenix-type 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 chan-
nel, selectable in eight steps, and Hard or Soft limiting characteristic.
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 security cover;
potentiometers shall be detented and provide attenuation from 0
dB to 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 (2x 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 pre-
vent 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 gray 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 88:4.
.
Architect’s and Engineer’s Specifications
C Series: Dedicated Installation Amplifiers
C 88:4