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VENT VOIDING THE WARRANTY. If the amp repeatedly blows fuses, it should be taken to a qualified
service center for repair.
WARNING: THE FUSE SHOULD ONLY BE REPLACED WHEN THE POWER CORD HAS BEEN
DISCONNECTED FROM ITS POWER SOURCE.
POWER SWITCH (28)
Center position is OFF. Two ON positions are provided, one of which will properly ground the amplifier. Switch
to the ON side that yields the lowest amount of residual hum or popping noise when the instrument is touched.
220 and 240 volt models have a two-way on/off switch only.
LINE CORD (120 V PRODUCTS ONLY) (29)
For your safety, we have incorporated a three-wire line (mains) cable with proper grounding facilities. It is not
advisable to remove the ground pin under any circumstances. If it is necessary to use the equipment without
proper grounding facilities, suitable grounding adaptors should be used. Less noise and greatly reduced shock
hazard exist when the unit is operated with the proper grounded receptacles.
OUTPUT BARRIER STRIP (30)
Provided for connection of external speakers. Power output is 150 watts RMS. This is available as a direct output
from the power amplifier or as transformer isolated outputs. Transformer outputs can be used for an 8 ohm
(35 V) loudspeaker or used to drive 25 V or 70 V speaker systems. Only one output should be used at a time.
The balanced transformer isolated line level output is provided for connection to booster power amplifiers,
additional sound systems, etc. This output is designed to deliver 1 V RMS into a 600 ohm load.
9 BAND GRAPHIC EQUALIZER
63 125 250 500Hz 1kHz 2kHz 4kHz 8kHz 16kHz
MAIN OUT
GR IN
AUX IN
TAPE IN
MAIN BUS
MON BUS
AUX BUS
AUX
MON
MAIN
AUX/TAPE
TO MON
AUX/TAPE
TO MAIN
TAPE
AUX OUT
MON OUT
TAPE OUT
GR OUT
600 OHM HI
600 OHM LO
GND
4 OHM
XFMR
N/C
COMMON
8 OHM
25 V
70 V
OUTPUT
XFMR
LOW Z
MIC
INPUT
CHANNEL 1-8
1
2
3
3 BAND EQ
Low Mid Hi
MAIN BUS
AUX BUS
MON BUS
LEVEL
MON
AUX
LINE
INPUT
MIC
PREAMP
-
+
6.8K
6.8K
PHANTOM
POWER
+48VDC
IRM
™
8150
BLOCK DIAGRAM
SPS
POWER AMP
PA IN