McIntosh C33 Owner's Manual page 15

Problem
Deep bass to weak
All bass weak
Voice reinforcement
Hum on program
Violins, trumpets dull
Cymballs not audible
The EQUALIZER FREQUENCY controls can be
switched to either the LISTEN or RECORD program
lines by the RECORD EQUALizer pushbutton. The
equalizer circuit is located after the COMPANDOR
circuit. Using the equalizer will not influence the be-
havior of the COMPANDOR.
R-RIGHT...turning the control to the right accents
the right channel by reducing the left channel output.
LOUDNESS
The LOUDNESS control (small center knob) pro-
vides a frequency response contour which compen-
sates for the behavior of the human ear at lower lis-
tening levels. This contour is accurately modeled
after the family of "equal loudness" curves identi-
fied by Fletcher and Munson. At the fully counter-
clockwise detented FLAT position, the loudness
contour is electrically flat. As the control is turned
clockwise, both bass and treble frequencies in-
crease in the correct proportion. The contour is not
affected by different settings of the VOLUME con-
trol. After setting the VOLUME control for the de-
sired listening level, adjust the loudness control for
the preferred compensation.
gram material. This can be used to restore compres-
sed material from tape recordings, records, or radio
broadcasts. Compression decreases the dynamic
Equalizer Correction
Raise 30
Raise 30 and 150
Lower 150 and raise 500
Reduce 30 and 150
Raise 1500
Raise 10 K
BALANCE AND LOUDNESS
The B A L A N C E
LOUDNESS controls are
concentric. The BALANCE
control (large outer knob)
adjusts the volume of the
channels relative to each
other.
L-LEFT...turning the con-
trol to the left accents the
left channel by reducing
the right channel output.
COMPANDOR SYSTEM
The Mclntosh Compan-
dor System can be used to
control the dynamic range
of program material. It can
be used in two different
ways. The circuits can by
switched to function as an
expander or as a compres-
sor. Expansion increases
the dynamic range of pro-
range. It can be used for making tape recordings or
for listening to background music. The Compandor
can be switched to either the record or listen lines.
In this way you can make your own recordings using
compression and then play them back using expan-
sion.
The Compandor System has a total of four con-
trols. The concentric COMPANDOR and RATIO con-
trols are located on the front panel. The LEVEL
MATCH and SPEED selector are located on the C 33
top panel.
COMPANDOR SELECTOR
The outer COMPANDOR knob can be set to EX-
PAND, OFF, or COMPRESS. When the COMPAN-
and
DOR switch is in EXPAND or COMPRESS, a red light
will appear above Listen or RECord at the COMPAN-
DOR pushbutton. In the center OFF position, the
Compandor System is switched out of the circuit
and the lights will be out. When the Compandor is
not used, the selector should be placed in the OFF
position.
RATIO CONTROL
The inner RATIO knob is used to control
amount of expansion or compression.
LEVEL MATCH
The LEVEL MATCH control on the top panel is us-
ed to restore the listening level when the expander
or compressor is switched into the circuit.
SPEED
The SPEED selector on the top panel is used to
control how fast the Compandor System responds
to signals. By switching from FAST to NORMAL to
SLOW, a more gradual rate of change in volume can
be heard. Select the position that sounds best to
you. If music with percussive instruments is used,
NORMAL or FAST can provide very attractive sound.
At the FAST speed the Compandor System follows
changes quickly but will track low frequencies less
accurately. Non-percussive music and voice require
slower speed. At SLOW speed the low frequency
tracking is accurate but the system will respond
more slowly. The NORMAL position is best suited
for most program material.
USING THE COMPANDOR AS AN EXPANDER
When the COMPANDOR selector is in the EX-
PAND position, the RATIO control is used to select
the amount of expansion. Full counterclockwise
rotation corresponds to a ratio of 1.0. This means
that the dynamic range of the expander output is the
same as the dynamic range of its input. Set the
VOLUME control to a normal listening level. No
change in dynamic range will be heard. As the
RATIO control is increased clockwise, however, the
output dynamic range becomes greater than the in-
put. Set the RATIO control to the desired expansion
-13-
the