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Front panel
The front panel presents the following amplifier status indicators:
POWER – Bi-color LED indicates standby (amber) and on (green).
TEMP (temperature) – Flashing amber indicates excessive
temperature in the power supply unit (PSU) or output stage(s).
When temperature exceeds the danger threshold, the LED
shows steady amber and the amplifier mutes.
The following indications are per channel:
SIG (input signal present) - Green indication when input signal
exceeds signal present threshold.
LIM (limit) – Illuminates when the amplifier limits the signal.
Limiting is engaged when the channel:
• Reaches the selected voltage limit threshold (as determined
by model and position of Rail Sensing Limiter (RSL) switch)
• Rail voltage sags below the selected threshold
• Maximum current output reached
• Mains voltage cannot maintain rail voltage
Rear panel
Important note on Auto Power On/Off – All E Series amplifiers
include an Auto Power Down/On (APD) scheme. As shipped
(factory default), the amplifier will go to low power standby mode
when no signal is present for 20 minutes. It will return to power
on mode when signal exceeds the signal present threshold. For
information on calibrating the signal present threshold, please refer
to the Operation Manual.
Power button and indication - When pressed momentarily,
toggles power state between standby and on. Indicator shows
amber for when it goes into standby and red if it is forced into
standby by pressing the power knob and green for on.
Attenuators - Range is 0 dB to -infinity; vertical is -10 dB. Amplifier
sensitivity is 4 dBu with attenuator at 0 dB and 14 dBu at -10 dB.
SIG - Illuminates green when input signal above Signal Present
Threshold (SPT). For adjustment of SPT value, please refer to the
full Operation Manual.
High-pass / Full-range – Selects flat or high-pass filter at 50 Hz.
70V / Lo-Z – The 70V position should be selected for constant
voltage systems. 100V loudspeakers can be driven, but the power
will be half of the selected tap. The 70V position is also used for
full rated power into 16 ohm loads. The Lo-Z position should be
selected for full power into 2 or 4 ohm loads, or for limiting
maximum output into 16 ohms. For 8 ohm; see table below.
The E Series can also be used asymmetrically; i.e. one channel
delivers more than the other(s). Please download the operational
manual for examples at www.labgruppen.com/support/download
70 V
16 ohms
Impedance
8 ohms
DRAW. NO - REVISION:
REVISION DATE:
DRAWED BY:
DATE CREATED:
1349 - Cowboy - Assembly
13. januar 2016 09:27:17
3. marts 2015 08:32:02
INITIALLY DESIGNED FOR:
TITLE:
SHEET:
MATERIAL:
TOL. UNLESS OTHERWISE NOTED:
1
1
of
4 ohms
SCALE:
MATERIAL NOTES:
1:1
A1
2 ohms
70 V
16 ohms
Impedance
8 ohms
4 ohms
2 ohms
*: If the "70V" mode is used
GPIO – GPIO allows use of external relays for power on and off.
See the Operation Manual for information on configuring GPIO.
Audio inputs
DRAW. NO - REVISION:
REVISION DATE:
DRAWED BY:
DATE CREATED:
1349 - Cowboy - Assembly
13. januar 2016 09:27:17
3. marts 2015 08:32:02
Audio inputs are electronically balanced and use three-pole
INITIALLY DESIGNED FOR:
TITLE:
Phoenix-type connectors. Follow the +, - and Ground labels
SHEET:
MATERIAL:
TOL. UNLESS OTHERWISE NOTED:
1
1
of
SCALE:
MATERIAL NOTES:
1:1
A1
when making connections.
Loudspeaker outputs
Loudspeaker outputs use detachable block-type connectors.
Maximum connector current rating is 41 Arms (exceeding capacity
of the amplifier). Cables up to 4 mm
Observe polarity to avoid low frequency cancellation loss.
4
Sensitivity and power (all channels driven equally)
for different impedances for the different models
E 12:2
E 8:2
4 dBu : 600 W*
4 dBu : 400 W*
4 dBu : 150 W /
4 dBu : 100 W /
3.7 dBu : 310 W*
2.1 dBu : 290 W*
4 dBu : 300 W /
4 dBu : 200 W /
3.8 dBu : 600 W*
2.1 dBu : 400 W*
4 dBu : 600 W
4 dBu : 400 W
1 dBu : 600 W
1 dBu : 400 W
Sensitivity and power (all channels driven equally)
for different impedances for the different models
E 4:2
E 5:4
4 dBu : 200 W*
4 dBu : 125 W*
4 dBu : 50 W /
4 dBu : 63 W /
-0.9 dBu : 200 W*
0 dBu : 125 W*
4 dBu : 100 W /
4 dBu : 125 W
-0.9 dBu : 200 W*
4 dBu : 200 W
1 dBu : 125 W
1 dBu : 200 W
N.R.
(12 AWG) can be accommodated.
2
E 10:4
4 dBu : 250 W*
4 dBu : 125 W /
3 dBu : 250 W*
4 dBu : 250 W
1 dBu : 250 W
N.R.
E 2:2
4 dBu : 100 W*
4 dBu : 50 W /
-0.9 dBu : 100 W*
4 dBu : 100 W
1 dBu : 100 W
N.R
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