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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