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trols: INPUT SELECTOR positions, AUX,
TAPE, TUNER 1, TUNER 2, or MIC, the
MUTING switch and TUNING control. When
the INPUT SELECTOR is turned to TAPE HD
then the COMP should be set to RIAA.
The input impedance of the tape recorder
should be 50,000 ohms or greater.
A jack marked L + R OUTPUT is located
next to MAIN OUTPUTS.
A monophonic signal can be distributed to
other rooms by connecting another power
amplifier to the jack marked L + R. The cable
connecting this output to the amplifier should
not have a capacity of more than 1000 mmf.
The input impedance of the power amplifier
connecting to this output should not be less
than 150.000 ohms (150K).
LOUDSPEAKER PHASING CONNECTIONS
Two pairs of screw terminals are located
on the lower left section of the C22 back
panel. The speaker leads from the "left"
power amplifier should be connected to the
screw terminals marked FROM AMPLIFIER.
The pair of terminals marked TO SPEAKER
should be connected to the "left" loud-
speaker.
These connections allow the front panel
PHASE switch to reverse the phase on the
left loudspeaker. This arrangement is con-
venient when setting up a stereo system.
GROUND CONNECTION
A single ground post is provided. The
chassis ground from turntable, record chang-
ers (motors used with each), tape decks,
etc., should be returned to this post. Do not
duplicate this ground circuit. Hum is likely to
be heard in the system if duplicate ground
returns are used.
The left and right program cables from
each source should be twisted together and
the ground wire from each source can be
wound or twisted in with these cables. To
avoid hum, make sure the ground wire does
not make any connections to shields of the
left and right channel cables except for the
connection provided with the C22 ground post.
OPERATING INSTRUCTIONS
BALANCING A STEREO SYSTEM
The performance and enjoyment of a
stereo system is greatly increased when the
system is properly balanced. There are two
factors that require balancing. One is the
unequal program loudness on the left and
right channels of a program source. The con-
trol marked BALANCE on the C22 is used to
balance unequal program loudness. Balanc-
ing a program for unequal loudness is ex-
plained under ADJUSTING BALANCE CON-
TROL TO CORRECT PROGRAM MATERIAL.
The other factor that requires balancing is
system balance. The balance of the stereo
system is affected by many things including
room acoustics, furniture placement, room
shape, small differences in loudspeakers,
etc. Balancing the system is done by adjust-
ing the controls on the power amplifiers.
To begin balancing the system, check to
see that the controls on the amplifier are
properly set. If the amplifier is a Mclntosh
MC225, set the input switch to STEREO. Turn
both input level controls to the black dot at
the 12 o'clock position of the control.
If the amplifier is a Mclntosh MC240 or
MC275 check to see that the cables from the
C22 are plugged into the STEREO INPUT
jacks. Then set the lever switch to STEREO.
Turn the BALANCE control to the 0 mark at
the 12 o'clock position of the control. The
amplifiers are now ready for the rest of the
steps to balancing the system.
1. Play a familiar recording on the record
player.
2. Push the two PANLOC buttons to release
the C22 from the mounting shelf. Pull the
C22 toward you until the latch locks en-
gage approximately 3 inches from the
front panel.
3. Turn the INPUT SELECTOR to the
PHONO position into which the record
player is connected.
4. Turn the BASS CONTROLS and TREBLE
CONTROLS so that the knob indicators
are centered between the panel mark-
ings L and R.
5. Turn the BALANCE control to the center
or 12 o'clock position.
6. Place the LOUDNESS switch in the
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