LOUDNESS AMPLIFIER
High level signals feed into the preamplifier past the input and mode switching, through
the volume control and then into the loudness amplifier. The C38 uses an active loudness
control circuit design. An integrated circuit operational amplifier is used with two separate feed-
back circuits. One feedback loop has flat frequency response, and the other loop has loudness
compensation. A potentiometer placed between these two feedback loops makes it possible
to select any degree of frequency response from flat, to full loudness compensation. The
overall gain of the loudness circuit is 20dB, which remains constant at mid frequencies,
regardless of the position of the loudness control. The bass and treble compensation increase
from the reference gain, and the desired amount of loudness compensation can be selected
at any volume control setting.
TONE CONTROL AMPLIFIER
The tone control amplifier uses high technology integrated circuit operational amplifiers.
The output stages have been optimized for optimum transient performance and minimum
distortion. Another set of operational amplifiers is arranged in a circuit configuration equivalent
to series tuned circuits. The series tuned circuits can be inserted into either the input, or
the feedback loop by means of a potentiometer. The proper choice of circuit components
results in a 12dB boost or cut at the desired bass and treble frequencies. When the tone
control potentiometers are at their center or detent positions, all tone control elements are
removed from the signal path, and the frequency response is perfectly flat.
SYSTEM EXPANSION CAPABILITY
Audio buffer and data switches feed all required data and signals to a rear panel 25 pin
subminiature "D" connector for system expansion. A Mcintosh CR10 Remote Control system
can be added using this connector to add the capability of controlling up to four additional
remote areas.
17
TECHNICAL
DESCRIPTION
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