Untitled
1. Precision Tracking Volume Control
The volume control, manufactured for Mclntosh
Laboratory, is a step attenuator which has tracking accuracy within 1 dB throughout its entire
range. Such extremely accurate matching is achieved through electronically controlled trimming
of the resistance material deposited on pairs of
printed circuits. Tracking accuracy and quiet performance are permanently maintained. Use does
not affect performance as in ordinary volume controls.
2. True Loudness Compensation
In the past, loudness controls have typically used
simple passive circuits connected to a portion of
the rotation range of the volume control. As a consequence, loudness compensation accuracy was
dependent on many variables such as speaker efficiency, amplifier gain and differences in input
level. The C 32 loudness control is continuously
variable, operates independently of the volume
control, and its contour is accurately modeled
after the Fletcher Munson family of "Equal
Loudness" curves.
3. Five Band Program Equalizer
Five separate controls permit individual musical
spectra shaping in two octave segments to satisfy personal preference or program limitations.
There is 12 dB plus or minus control at center frequency of the individual segments. The center frequencies are 30,150,500, 1500and 10,000Hz. The
program equalizer and filters can be switched out
expanding the frequency response to 10 Hz to
100,000Hz.
4. Low and High Frequency Filters
The low frequency (LF) filter attenuates-the program material at 12 dB per octave below 50 Hz to
help eliminate rumble, acoustic feedback and
other similar unwanted noises. Above 7000 Hz the
high frequency (HF) filter attenuates hiss, scratch
and such unwanted noise at 12dB per octave. The
LOUDNESS, PROGRAM EQUALIZER and HF/LF
filters all use ion implanted junction field effect
operational amplifiers (op amps) which have a 6
dB better signal to noise ratio than the usually used op amps.
5. Triple Shielded Power Transformer
A solid copper band, a silicon steel band and a
mild steel outer casing confines the magnetic
field of the power transformer to reduce the
potential for hum pickup in either theC 32 or
associated equipment. This expensive construction assures that you are not limited on how or
where to install your equipment. The power
transformer feeds a regulated power supply.
6. Silent Turn OnlTurn Off
A relay, time controlled by a transistor switch, delays the connecting of the preamplifier output to
the output jacks to eliminate turn-on noise, clicks
and pops. The same circuit turns the relay off
before the main power supply has time to
discharge.
7.Auto Turn OnlTurn Off
Power to the entire stereo system can be controll-
ed from either the front panel.power switch or the
turntable's power switch. A current sensing relay
connected to the turntable AC power outlets is
controlled by the turntable power switch. The
relay, in turn, controls the AC power to the remainder of the system.
8. Electronic Input Selection
Both LISTENand RECORDinput selectors control
Jow DC voltages that electronically control Field
Effect Analog switches. Because the FET analog
switches are located near the input jacks, the
length of leads are very much reduced. Noise,
switch clicks and pops are eliminated while the
potential for hum pickup is substantially reduced.
9. Very Low Impedance
Phono Preamplifier
Four specially selected transistors are arranged in a low impedance circuit to reduce noise to
the lowest achievable level of any pre amp. The
circuit follows the RIAA equalization curve
precisely.
10. Monitor Amplifier
A wide band, very low distortion 12 watts per
channel power amplifier feeds the front panel
Headphone jacks, the 600 ohm line outputs and
monitor outputs. You can listen in private to headphones with the main power amplifier turned off,
use the Monitor Output to feed remote
loudspeakers or in association with audio time
delay devices and many other applications.
11. Expa nder
Recording imposes dynamic range limitations on
most program sources, causing unwanted noise
or hum to be heard during quiet passages. The
Mclntosh logarithmic expander restores the
dynamic range and reduces the unwanted noise.
Controls are provided that adjust the expansion
ratio, the attack time and level matching.
12. Separate Listen/Record
Program Lines
Record on up to 3 tape recorders from any connected source or copy from one tape recorder to
another with complete independence from the
program being listened to. The RECORD and
LISTEN input selector switches operate without
any interaction. The program being recorded can
be monitored easily by pushing the appropriate
monitor pushbutton.
13. Two Turntable Facilities
.
With either input selector switch in the PHONO
position the front panel pushbutton selects between two turntables. This convenience makes it
easy to go from one record to another without interruption. While tape recording it is easy to intermix cuts from different records without any
clicks, pops or noise.
14. Program Output Switching
Special rear panel jacks may be connected to two
additional power amplifiers to feed preqrarn
material to remote areas. Front panel pushbuttons will turn the program on or off to the remote
amplifiers. Alternately, the pushbuttons can control remote speaker systems when used with an
accessory switching relay (the Mclntosh SCR 2).
THE MclNTOSH PROMISE OF PERFORMANCE
We promise you that the C 32 you buy must be
capable of performance
at or exceeding these limits
or you get your money back. Mclntosh
PERFOR·
MANCE LIMITS are the maximum
departure from
perfection
permitted for a Mclntosh instrument.
PERFORMANCE
FREQUENCY RESPONSE
+ 0 - 0.5 dB 20 Hz to 20,000 Hz
(with Equalizer Out: + 0 -1 dB from 10 Hz to 100,000 Hz)
DISTORTION
.05% maximum, at rated output level, 20 Hz to 20,000 Hz
INPUT SENSITIVITY AND IMPEDANCE
PHONO 1 and 2: 2 millivolts at 47,000 ohms 65 pF;. AUXILIARY,
TUNER, TAPE 1, 2 and 3: 250 millivolts at 50,000 ohms
HUM AND NOISE
AUXILIARY, TUNER, TAPE 1, 2, and 3: IHFA 100 dB; unweighted ·90
dB. PHONO 1 and 2: IHFA 90 dB; unweighted 80 dB below 10 millivolt
input or equivalent to less than 1 microvolt at the input terminals
OUTPUT LEVEL AND IMPEDANCE
MAIN Output: 2.5 volts with rated input, 220 ohms source impedance,
to operate into 5,000 ohms or greater
TAPE Output: 250 millivolts with rated input to operate into 5,000
ohms or greater
PROGRAM EQUALIZER
Five, 2 octave frequency bands, each band has 12 dB of boost or cut
at 30, 150,500, 1500 and 10,000 Hz
LF FILTER
Flat or roll-off at 12 dB per octave below 50 Hz
HF FILTER
Flat or roll-off at 12 dB per octave above 7000 Hz
VOLTAGE AMPLIFICATION in Decibels
lat)
Main
Tape
Monitor
Input
Output
1,2,3
Amp
Auxiliary, Tuner
Tape 1, 2, or 3
Phono 1 or 2
20 dB
62 dB
o dB
"
42 dB
20 dB
"
62 dB
MONITOR AMPLIFIER
MONITOR, HEADPHONE, LINE Output: 12 watts per channel, continuous, into 8 ohms at 0.1 % harmonic distortion 20 Hz to 20,000 Hz
or 5 volts RMS into 600 ohm line - level controls provided
FACILITIES
AND FEATURES
INDEPENDENT RECORD/LISTEN INPUT SELECTOR
Totally independent program selectors permitting recording one program source while listening to a second program source without any
interference
MODE SELECTOR
Seven positions - Left channel only to both speakers. Right channel
only to both speakers, STEREO REVERSE, STEREO, MONO (L + R),
L + R to Left speaker only, and L + R to Right speaker only
PROGRAM EQUALIZER
Five frequency band program equalizers to modify the signal to suit
your taste
Step attenuator with matched elements for precision tracking at all
listening levels. Does not change stereo balance as volume is changed
MONITOR AMPLIFIER
Very high quality amplifier that provides power to the HEADPHONE
JACKS, the LINE OUTPUT and the back panel MONITOR OUTPUT
connectors
HEADPHONEJACKS
For listening with either low or high impedance dynamic stereo headphones. Power to this jack is supplied by an amplifier provided in the
C 32. Headphone listening can be accomplished without the use of
an external power amplifier
FRONT PANEL TAPE JACKS
Allows connection to input and output of a tape recorder from the
front panel
EXPANDER
A logarithmic expander that restores the dynamics that were lost to
the program material in the broadcast or recording process
AUTOMATIC SYSTEM TURN ON/OFF
A current sensing relay turns the entire stereo system AC power on
or off controlled by the turntable power SWitch
LOUDNESS
Flat response or continuously variable loudness compensation accurately following the family of Fletcher Munson "Equal Loudness"
curves
GENERAL
INFORMATION
SEMICONDUCTOR COMPLEMENT
67 Transistors
35 Integrated Circuits
62 Diodes
2 Field Effect Transistors
1 Silicon Controlled Rectifier (SCR)
AC POWER OUTLETS
2 Automatic current sensing (green)
4 Switched (black)
POWER REQUIREMENTS
120 volts, 50/60 Hz, 25 to 85 watts
MECHANICAL
INFORMATION
SIZE
Front panel measures 16 inches wide (40.6cm) by 5-7/16 inches high
(13.8 cm). Chassis measures 14-3/4 inches wide (37.5 cm) by 4-13/16
inches high (12.2 cm) by 13 inches deep (33 cm), including PANLOC
shelf and back panel connectors. Knob clearance required is 1-1/14
inches (3.2 cm) in front of the mounting panel
FINISH
Front panel is anodized gold and black with special gold/teal
nomenclature illumination. Chassis. is black
MOUNTING
Exclusive Mclntosh developed professional PANLOC
WEIGHT
27 pounds (12.2 kg) net 39 pounds (17.7 kg) in shipping carton
The continuous improvement of its products is the policy of
Mclntosh Laboratory Incorporated, who reserves the right to improve
design without notice.
mtlnfosh
MclNTOSH LABORATORY INC.
2 CHAMBERS ST., BINGHAMTON, N.Y. 13903
607-723-3512
039-113
Printed in U.S.A.
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