McIntosh C27 Owner's Manual page 9

will turn main or remote loudspeakers on or off when a
power amplifier has been properly connected to the C 27
rear panel.
FILTER OPERATION
OUT: Filter disconnected, program not modified by
either high or low frequency filters.
LF (LOW FREQUENCY FILTER)
Use the LF position to reduce objectionable low-
frequency noise created by a turntable or record changer
or acoustically coupled feedback. Response is rolled off
below 50 Hz.
HF (HIGH FREQUENCY FILTER)
Use the HF position to reduce objectionable high-
frequency noise such as record scratch. Response is
rolled off above 5,000 Hz.
LF-HF
Both high and low frequency filters are activated.
SPEAKERS OPERATION
OUT: All speakers are disconnected. Program is fed only
to the HEADPHONE jack for private listening.
1: Program is fed only to the rear panel SPEAKER 1 con-
nectors and the HEADPHONE jack. SPEAKER 2 is
disconnected.
1 & 2: Program is fed to the rear panel SPEAKER 1 and
2 connectors and the HEADPHONE jack.
2: Program material is fed only to the rear panel
SPEAKER 2 connectors and the HEADPHONE JACK.
SPEAKER 1 is disconnected.
BASS
Concentric, 11 position, tone control switches adjust
the bass. The outer knob adjusts the right channel bass
response. The center knob adjusts the left channel bass
response.
Left: Adjusts the bass loudness from the left loudspeaker.
Clockwise rotation increases the bass loudness while coun-
terclockwise rotation decreases the bass loudness. Each
step of the tone control adjusts the bass loudness about 4
dB.
Right: Has the same effect on the sound from the right
loudspeaker.
TREBLE
Concentric, 11 position, tone control switches adjust
the treble. The outer knob adjusts the right channel re-
sponse. The center knob adjusts the left channel treble
response.
Left: Adjusts the treble loudness from the left loud-
speaker. Clockwise rotation increases the treble loudness
while counterclockwise rotation decreases the treble loud-
ness. Each step of the tone control adjusts the treble
loudness about 4 dB.
Right: Has the same effect on the sound from the right
loudspeaker.
LOUD/BALANCE
LOUDNESS:
Use the loudness control for full frequency range listen-
ing at even the softest listening levels. The LOUDness
control (the small center knob of the concentric control)
provides low-frequency boost to compensate for a hearing
characteristic of the human ear at low listening levels.
The ear becomes less sensitive to low frequencies as volume
is reduced. Increased loudness compensation is therefore
desirable at lower listening levels. The loudness control
boosts the low frequencies so that the ear hears approxi-
mately the same musical balance as it would at higher
listening levels.
FLAT: (Maximum counterclockwise rotation) Full volume
with flat frequency response. The loudness compensation
is inoperative in this position.
Turning the control clockwise toward MAX reduces the
listening volume, and automatically increases the compen-
sation by boosting bass.
BALANCE
The BALANCE control adjusts for unequal volume in
either the left or right channels. The volume of the chan-
nels can be varied relative to each other without affecting
their combined volume.
Turning the control to the left accents the left channel
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