McIntosh C20 Owner's Manual page 6

BALANCE
BALANCE
LEFT
This control balances the C20 for unequal pro-
gram sources.
LEFT . . . turning the control to the left slowly
reduces the right channel to no output and
accents the left channel.
RIGHT . . . turning the control to the right slowly
reduces the left channel to no output and accents
the right channel.
HF CUTOFF FILTER
HF CUTOFF FILTER
FLAT
This three-position switch minimizes surface noise
when reproducing old, badly worn recordings. Its posi-
tions are as follows:
FLAT... filter disconnected.
9KC .. . rolls off response sharply starting at 9KC.
5KC . . . rolls off response sharply starting at 5KC.
LOUDNESS
L0UDNESS
2
I
FLAT
Music reproduced at very low volume loses its
bass and treble due to a selective shift in sensitivity
of human hearing. This effect is known as the Fletcher-
Munson hearing characteristics. (See page 15, Figure
13.) The LOUDNESS control corrects for this effect.
RUMBLE FILTER
4
0
RIGHT
9KC
5KC
3
4
5
RUMBLE
FILTER
IN-ON
With the RUMBLE FILTER button pushed to the
IN position, low-frequency rumble noise below 60 cps
created by a turntable or changer and undesirable
acoustically coupled feedback are reduced.
TAPE JACK
IN-PLAYBACK
OUT-RECORD
This pushbutton controls the signal direction to
or from the front panel telephone jacks.
IN-PLAYBACK . . . TAPE input is switched from
rear tape jacks to front panel telephone jacks.
Any program originating from a portable machine
connected to the C20 can be heard by rotating
the INPUT selector to the TAPE position.
OUT-RECORD . . . connect signals from the rear
tape jacks to the INPUT SELECTOR TAPE posi-
tion. Any program picked up by the C20 is con-
nected to the portable machine for recording,
TAPE COMPARE
COMPARE
This pushbutton makes it possible to instantane-
ously compare the recorded material with the source
signal. TAPE COMPARE jacks are provided on the back
panel to accept a signal- from a tape recorder with a
monitor head and preamplifier. When the TAPE COM-
PARE pushbutton is in the out position, the program
source is fed through the power amplifiers and the
loudspeakers. When the TAPE COMPARE pushbutton
is in the IN position (depressed), the signal source
becomes the monitored program from the recorded tape
and is fed through the power amplifiers and loud-
speakers.
IMPORTANT
When the TAPE COMPARE pushbutton is de-
pressed, signal from any other source will
not be heard from the loudspeakers. When
not in use, make sure the pushbutton is in
the out position.
TAPE
JACK
TAPE
IN-TAPE