Adjusting The Top Panel Controls
You will enjoy the best in stereo performance more
when the stereo system is properly balanced. For
proper balance each channel must be equal in loud-
ness and similar in frequency response. Use the top
panel LEVEL controls to balance system loudness
and the top panel BASS TRIM controls to balance for
frequency response differences at low frequencies.
Do not use the front panel BALANCE control to
correct for system unbalance. The BALANCE control
is used to adjust for any unbalance in the source
material, the record, etc.
Before attempting to balance the output of the C 28
make certain the front panel controls are set properly.
Turn the VOLUME control to the OFF (totally coun-
ter-clockwise) position.
Set the MODE SELECTOR to STEREO and the
BALANCE control at the center or 12 o'clock position.
Turn the tone controls to the center or 12 o'clock
position. The HF and LF pushbuttons should be in
the OUT position and the COMPensation control in
the FLAT position. Turn the INPUT SELECTOR to
TUNER.
Depress the PANLOC buttons and pull the pre-
amplifier out to the adjust position. The controls on
the top panel are now easily adjusted.
On the top panel turn the BASS TRIM controls
counter-clockwise. Turn all the level controls to the
clockwise position. Turn the POWER AMPLIFIER
switch on.
With the tuner turned on, turn up the VOLUME
control on the front panel until a comfortable room
loudness is reached.
Then switch the INPUT SELECTOR to PHONO 1,
the MODE SELECTOR to L TO L & R, use a mono-
phonic record and turn down the top panel LEFT
PHONO 1 LEVEL control to match the loudness of the
tuner. Repeat the procedure with the RIGHT PHONO
1 LEVEL control. When the channels are equally loud
the system is balanced for loudness.
Repeat the same steps for PHONO 2.
Bass Trim
A control has been provided in each channel that
adjusts the bass loudness. These controls are used
to compensate for the differences in loudspeaker re-
sponse at low frequencies or for the room in which
they are used. They are variable controls that provide
up to 6 dB of boost below 100 Hz. With the control
in the counter-clockwise position the response is flat.
Clockwise rotation increases the bass loudness. Ad-
just one channel at a time.
Headphone Level
A control has been provided in each channel to
adjust the loudness of the program when using head-
phones. The controls adjust the output in each chan-
nel to the HEADPHONE jack only and do not affect
the program loudness from the loudspeakers. To ad-
just for comfortable headphone listening first adjust
the VOLUME control to the front panel to normal
room loudness. Then, while wearing the headphones,
adjust the HEADPHONE LEVEL control to the desired
loudness level.
Output Level
A control has been provided in each channel that
adjusts the output of the preamplifier. Use these con-
trols to compensate for minor differences in loud-
speaker efficiency or amplifier gain. These controls
adjust the level to the MAIN OUTPUTS only.
With the MODE SELECTOR in the MONO (L + R)
position set the BALANCE control to 12 o'clock. Ad-
just the top panel OUTPUT LEVEL controls until the
loudness from each loudspeaker is equal.
Center Channel Level
A control has been provided that adjusts the com-
bined left plus right program level to the CTR output
jacks.
Power Amplifier On/Off
A switch has been provided that will control the
AC power to the green POWER AMPLIFIER recepta-
cles independently of the C 28 front panel control.
Use this switch to turn off the amplifier when listen-
ing to the headphones, etc.
IMPORTANT: TO HEAR THE PROGRAM FROM THE
LOUDSPEAKERS THIS SWITCH MUST BE IN THE
ON POSITION.
8
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