COMPENSATE FOR EAR
CHARACTERISTIC AT
REDUCED VOLUME ON
ALL CHANNELS.
SELECT DESIRED TREBLE
ROLL-OFF ON ALL CHANNELS.
SELECT DESIRED BASS
COMPENSATION ON
CHANNELS 4 AND 5.
REDUCE TURNTABLE RUMBLE,
OR LOW FREQUENCY DISTURB-
ANGES ON ALL CHANNELS.
- 6 -
SELECT ANY ONE OF FIVE
INPUT CHANNELS. UNUSED
CHANNELS ARE GROUNDED
TO PREVENT CROSSTALK.
CONTROL BASS RESPONSE
ON ALL CHANNELS
CONTROL TREBLE RESPONSE
ON ALL CHANNELS.
CONTROL VOLUME ON
ALL CHANNELS, ON-OFF
CONTROL.
Channels 1 and 2:
Channels 1 and 2 are each terminated by a potentiometer mounted on the back
panel which should be used to reduce signal input to these channels if in excess of
.07 volts. Correct adjustment occurs when the sound level of channels 1 and 2 is
equivalent to that of channels 4 or 5. High impedance sources, such as crystal
microphones and the detector output of tuners, may be connected directly to these
channels since they have an input impedance of 660, 000 ohms.
Channel 3:
Channel 3 is terminated by a 100, 000 ohm potentiometer mounted on the back
panel which should be used to reduce signal input to this channel if in excess of
10 MV. Low impedance microphones in conjunction with an input transformer,
such as McIntosh M-107, may be used on this channel.
Channels 1, 2 and 3 provide flat amplification from 20 to 20, 000 cycles. All
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