E 12:2
Architects’ and Engineers’ Specification
E Series: Installation-Focused Amplifiers
E 12:2
Overview: Channel Modes
The power amplifier shall be Energy Star 3.0 certified. It shall provide
two discrete channels of amplification, with each channel capable of
independently driving either low-impedance or high-impedance (70 V)
loads. The output circuit shall be an inherently bridged Class D
topology. Maximum total output with both channels driven shall be
1200 W.
Power Output and Performance
The power amplifier shall offer two power output modes (Lo-Z and
70 V) selectable by a rear-panel switch. Power output per channel,
both channels driven, shall be as follows in Lo-Z mode: 600 W into
2 ohms, 600 W into 4 ohms, 300 W into 8 ohms and 150 W into
16 ohms. Power output per channel, both channels driven, shall be
as follows in 70 V mode: 600 W into 8 ohms, 310 W into 16 ohms,
and 600 W into a 70 V system. The amplifier shall incorporate a rail
voltage sensing circuit to ensure low distortion. Peak voltage output
per channel shall be 100 V (70 V rms); maximum output current per
channel shall be 18 Arms. Power outputs higher than stated prior
shall be possible in one channel with asymmetrical loading or with
no load connected to the other channel. Gain shall be 35.2 dB in
70 V mode and 32 dB in Lo-Z mode. The amplifier shall exhibit the
following performance parameters: Frequency response shall be
2 Hz to 40 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 greater than 112 dBA. THD at 1 watt (20 Hz - 7 kHz) shall be
less than 0.1%; THD at 1 kHz shall be no more than 0.05% at 1 dB
below clipping.
Connectors, Controls, and Indicators
The following connectors and controls shall be provided on the REAR
PANEL of the amplifier. The input connectors shall be electronically
balanced, 3-pin detachable screw terminals. The output connectors
shall be 2-pin detachable screw connectors. GPIO (General Purpose
Input/Output) functions shall be provided on two 2-pole detachable
screw terminal connectors. Two detented potentiometers shall
provide level adjustment from -infinity to 0 dB. A power switch shall
toggle between On and Standby power states. The following LED
indicators shall be provided on the FRONT PANEL of the amplifier:
One bi-color power indicator (amber standby, green on); one
temperature indicator (flashing amber warning and steady amber
over-temperature/mute); two LED indicators per channel, one for
signal present and one for limiter active.
Power Supply, Protection, and Cooling
The power supply shall be a universal type (AC line input between
100 and 240 VAC at 50 or 60 Hz). The power supply shall offer three
modes for power on/standby/off. Default mode shall be auto-power
down (APD): the amplifier shall go into standby mode when no signal
is present at the inputs for 20 minutes; power on mode shall resume
with restoration of input signal. Standby power consumption shall be
less than 1 W. Alternative power modes shall be manually switched
on/standby or external power sequencing via GPIO connections.
The amplifier shall be cooled by a temperature-controlled, variablespeed fans with air flow from front to rear.
The amplifier shall be 483 mm (19 in.) wide, 44 mm (1.75 in. / 1 U)
high, and 276 mm (10.9 in.) deep. The weight shall be no more than
4.2 kg (9.3 lbs). The chassis shall be black painted steel with a grey
painted aluminum front-panel. The amplifier shall be approved for use
as specified by CE. The amplifier shall be the Lab.gruppen E 12:2.
Item no. AES-E12.2 V2 - 02.04.14
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