- 2 -
4. The Audio Compensator delivers 2. 5 volts of audio signal at full out-
put. The gain control of the power amplifier should be adjusted as out-
lined in the amplifier instruction manual for this sensitivity. (McIntosh
Amplifier Models A-116, MC-30, MC-60, set gain control fully counter
clockwise; 50W-2 and 20W-2 fully clockwise.)
5. Turn the volume control on the Audio Compensator to "OFF".
6. Insert power cord of the Audio Compensator into a 117V., 50/60
cycle power outlet.
7. Turn the Selector Switch on the Audio Compensator to "5" and Bass
control fully clockwise.
8. Turn the volume control on the Audio Compensator clockwise until
the power switch is activated. Allow thirty seconds for warm-up, then
advance the volume control to "10".
9. C-4: Adjust the hum reducing potentiometer on the power amplifier
for minimum hum. C-4P: Adjust the hum reducing potentiometer on
the power supply for minimum hum.
10. Turn the volume control on the Audio Compensator to "OFF".
11. Insert inputs into their proper jacks at the back of the Audio Com-
pensator, and all A.C. power cords into the A.C. outlets provided.
INPUT CONNECTING PROCEDURE
The inherent hum and noise voltages applied to the input of the Audio Com-
pensator are -110 DBM, or less than 3 microvolts. To avoid lowering the
signal to hum ratio of the Audio Compensator, by adding hum voltages to the
input, extreme care must be taken in its installation. We offer the following
recommendations as a guide to installation:
1. Connect inputs of Audio Compensator as outlined on the table below.
CHANNEL
TAPE
AND
TUNER
MIC
PHONO 1
AND
PHONO 2
FOR USE WITH
Radio or TV Tuners
Tape Recorders
Crystal or Ceramic
cartridges
Crystal Microphones
Low Impedance
Microphone
Phonograph C a r t -
ridges (magnetic
or constant
amplitude)
INPUT
MIN.
60MV
3MV
3MV
MAX.
20V
1V
1V
GAIN
32db
52db
52db
REMARKS
Inputs in excess
of the recom-
mended minimum
should be reduced
by the level ad-
justments located
on the back panel.
See text for com-
plete operation.
2. The Audio Compensator and magnetic phonograph cartridges should be
mounted at least two feet from power transformers.
3. Inter-unit cables provide a complete ground system. Alternate ground
wires should not be used since they will produce ground loops and increase
the hum level.
