Using The Front Panel Controls - McIntosh C28 Owner's Manual

In the upper left of the front panel is a concentric
control. The large outer knob is the BALANCE con-
trol. The small center knob is the COMPENSATION
control.
BALANCE
The BALANCE control adjusts for unequal loud-
ness in either the left or right channels. The loud-
ness of the channels can be varied relative to each
other without affecting their combined loudness.
Left . . . turning the control to the left accents the
left channel by reducing the right channel output.
Right . . . turning the control to the right accents
the right channel by reducing the left channel out-
put.
COMPENSATION
The COMPENSATION control is a three position
switch.
Pres: In the left of center position the response of
the C28 is shaped to emphasize the upper mid-
frequencies.
Flat: In the center position the response of the C 28
is unmodified.
Loud: The LOUDness control automatically pro-
vides the correct amount of bass required to com-
pensate for the change in response of the human
ear at low loudness levels.
When the volume is reduced, the music will
seem to lose much of its bass and some of its
treble. This effect is due to the sensitivity charac-
teristic of human hearing. The response of the hu-
man ear to bass and treble pitch decreases more
rapidly than its response to pitch centered in the
mid-tonal range. The LOUDness switch converts
the volume control to a loudness compensated
control. Use LOUDness to listen at low volume and
still hear full-frequency range.
INPUT SELECTOR
Aux: Connects the output from any high level pro-
gram source requiring flat amplification to the high
level input stage. Such a source could be a tele-
vision set. In the AUX position the gain is 20 dB to
the MAIN outputs, 0 dB to the TAPE outputs, and
17.5 dB to the LINE outputs. The input impedance
is 250,000 ohms.

Using The Front Panel Controls

Tuner: Connects the output from any AM, FM or
MPX FM tuner to the high level input stage. In the
TUNER position the C 28 has flat amplification.
There is 20 dB of gain to the MAIN outputs, 0 dB
to the TAPE outputs and 17.5 dB to the LINE out-
puts. The input impedance is 250,000 ohms.
Phono 1: Connects the output of any magnetic
phono cartridge to the low level input stage. The
response has been shaped to compensate for the
characteristics of the magnetic phono cartridge.
The gain at 1,000 Hz is 62 dB to the MAIN outputs,
42 dB to the TAPE outputs and 59.5 dB to the LINE
outputs. The input impedance is 47,000 ohms.
Phono 2: Same as PHONO 1.
Mic: Connects the output of any high impedance
microphone to the low level input stage. In the MIC
position the C 28 has flat amplification. The gain
is 60 dB to the MAIN outputs, 40 dB to the TAPE
outputs and 57.5 dB to the LINE outputs. The input
impedance is 500,000 ohms.
Tape Hd: Connects the output of any tape head (a
tape deck without its own electronics) to the low
level input stages. The response has been shaped
to compensate for the characteristics of the tape
head. The gain at 500 Hz is 64 dB to the MAIN out-
puts, 44 dB to the TAPE outputs and 61.5 dB to the
LINE outputs. The input impedance is 500,000
ohms.
MODE SELECTOR Connects the program to the
loudspeaker in the following seven ways:
L to L & R: Connects the "left" input to both loud-
speakers.
R to L & R: Connects the "right" input to both loud-
speakers.
Stereo Rev: Connects the "left" input to the "right"
loudspeaker and the "right" input to the "left"
loudspeaker.
Stereo: Connects the "left" input to the "left" loud-
speaker and the "right" input to the "right" loud-
speaker.
Mono (L + R): adds the "left" input and the "right"
input and then connects the L + R program to both
amplifiers and loudspeakers.
L + R to L: Connects the "left plus right" program
to the "left" loudspeaker only.
L + R to R: Connects the "left plus right" program
to the "right" loudspeaker only.
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