The Mclntosh MAC 4200 is a high quality, FM/AM Stereo
Receiver whose design has been governed by insistence
on high performance with long life, great flexibility and
sensitivity. The rated power output is a 75 watts per chan-
nel into 8 ohms or 100 watts per channel into 4 ohms.
You will derive the greatest enjoyment and most
satisfaction when you understand its operations and its
functions. Your time invested now will return added value
to you because then you will get the best results from
your MAC 4200.
The advanced FM/AM tuner design of the MAC 4200
displays the station frequencies digitally. The display of
frequencies in the MAC 4200 serves a double function. It
shows the input selected as well as the frequency to
which the tuner is adjusted. Stations are selected easlily
either by use of the manual tuning knob, or the scan up
or down feature on either band or by use of the preset
feathertouch-buttons in either FM or AM.
The low noise electronic input switching system uses in-
put leads that are very short, one twentieth of the length
of other systems. This provides for reduced hum and
noise, better source to source isolation (lower crosstalk),
lower distortion and freedom from high power TV and
radar signal interference.
The precision tracking volume control allows completely
noise free performance and accuracy of the channel to
channel balance over the full range. It is a step attenuator
whose channel accuracy is within 1 dB throughout its en-
tire rotation. Such extremely accurate matching is achiev-
ed through electronically controlled trimming of the
resistance material deposited on pairs of printed circuits.
Use does not affect performance as in ordinary volume
controls.
The loudness control is continuously variable. It
operates independently of the volume control, and its
contour is accurately modeled after the family of "Equal
Loudness" curves developed by Drs. Fletcher and Munson.
Loudness controls in ordinary equipment are usually sim-
ple, passive circuits connected to a portion of the rotation
range of the volume control. As a consequence, loudness
compensation accuracy is dependent on many variables
such as speaker efficiency, amplifier gain and differences
in input level.
A five band program equalizer permits the volume ad-
justment of five important frequency ranges. Musical
balance can be adjusted to compensate for listener
preferences or recording inaccuracies. At the detent in the
center of the rotation of each control the equalizer cir-
cuits are disconnected, completely removed from the
operating circuits.
Front panel tape recorder jacks make playback from, or
copying to, a portable recorder very convenient. The ad-
ditional tape recorder may be connected to the
MAC 4200 without disconnecting your regular system.
The MAC 4200 switching circuits allow the AC power to
the entire stereo system to be controlled from either the
turntable's power switch or the power switch on this ex-
ceptional receiver. Connected to a special power outlet is
a current sensing relay that will be energized when the
turntable is turned on or when the red power switch is
pushed on. The relay, in turn, controls the AC power to
the rest of the stereo system.
POWER GUARD dynamically permits the power amp-
lifier circuit in the MAC 4200 to deliver full maximum
power without the music destroying sounds of hard clip-
ping; the music you hear is protected from distortion and
your speakers are protected from damage.
Electronically regulated power supplies maintain stable
operation even during periods of low or changing AC
power line voltage.
INTRODUCTION 3
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