"Simplicity, flexibility, and beauty have been integrated by careful engineering and design in the McIntosh C-20 Stereo Compensator. The greatest listening pleasure in stereo or monophonic reproduction is assured as a result of over a year of careful and diligent research in hte requirements of a new preamplifier designed for stereo. Full stereo flexibility has been provided plus built in protection for your investment in monophonic records. McIntosh has designed in the C-20 Stereo Compensator the necessary features required to give the finest monophonic reproduction the keenest listener may require. Complete satisfaction is yours in monophonic and stereophonic with the McIntosh C-20 Stereo Compensator."
"The C20 is the only Stereo Control Console that has enough flexibility to control all program sources.
The C20 is the only Stereo preamp with enough record compensation for the valuable Monophonic as well as the new Stereo records.
The C20 has the most complete facilities for tape recording, playback, dubbing and monitoring.
The C20 has by far the simplest yet complete control of tone balance.
The C20 is by far the easiest to mount and still give professional appearance.
The C20 is produced from three years of careful thorough research and development"
Input Selector: Selects any one of eight program sources including Tape, Tuner 1 and 2, Auxiliary, phono 1 and 2, Tape Head 1 and 2. Each phono input has two switch positions, one for stereo, the other paralleles the stereo cartridge for Monophonic records.
Reverse; connects left channel to left speaker, corrects for left-right reversal of program.
Stereo; (normal stereo mode selector position) left channel to left speaker, right channel to right speaker.
Left; left channel to left speaker; no program to right speaker
Right; right channel to right speaker; no program to left speaker
M Left; left channel only to both speaker
M Right; right channel only to both speaker
Record Compensator: Separate bass and treble compensator switches including RIAA, LP, Tape-Head, flat position for microphone and other positions for monophonic records. (Turning TREBLE control to TAPE gives flat response. Turning BASS to 0 gives flat response.)
Treble: Boast 13 dB at 20,000 Hz, attenuate 18 dB at 20,000 Hz
Bass: boost 16 dB at 20 Hz, attenuate 20 dB at 20 Hz
Balance Control: To balance forunegual programsource. Turning control to left reduces right channel to No Output. Turning control to right reduces left channel to No Output
Phase Control: Reverses phase in the left channel to correct for speaker program phasing.
HF Cutoff Filter: Three positions providing (1) no filter action for normal use, (2) 9KC cutoff, and (3) 5KC cutoff to suppress record noise and hiss.
Loudness Control: Compensates for the Fletcher-Munson hearing character stics as program loudness is reduced.
Rumble Filter: Suppress low frequency disturbances such as rumble.
Tape: Front panel jacks, push button switch controlled to permit the addition of a portable tape recorder without disrupting the equipment permanently installed.
Tape Monitor: To permit instantaneous monitoring of tape before and after recording.
Low Frequency Trim Controls: On the back panel. Compensate for unequalresponse at low frequencies due to position at speakers or differences in speaker efficiency. Provides 6 dB boost at 50 Hz starting from 500 Hz or 8 dB cut at 20 Hz starting from 200 Hz.
Frequency Response: 20 - 20,000 Hz ±0.5 dB
Distortion: Less than 0.2% at rated output, 20 -20,000 Hz
Hum and Noise: High level inputs - 85 dB below rated output, Low level inputs, less than 2 microvolts at input terminals
Input sensitivity and impedance:
Aux, Tape, Tuner 1, Tuner 2; 0,25 volts at 470 kohm,
Phono 1 and 2: 2 - 10 millivolts at 47 kohm for low output cartridge, 10 -70 millivolts 47 kohms for hi output cartridge, 0,1 volt 220 mmf in series with 47 kohms for Xtal or Ceramic
Tape Head 1 and 2: 2 to millivolts 47 kohms for low output head
tape Compare (Monitor): 0,25 volts, 115 kohms
Main Output: 2,5 V with rated input 2 output jacks in parallel for each channel.
Tape Output: 0,25 V with rated input 1 output jack for each channel
Left plus right output: 2,5 volts from source impedance of 23 kohms
Voltage Amplification: Low level inputs to Main Output: 1,000 to 1 (60 dB) at 1000 Hz
Low level inputs to Tape Output: 100 to 1 (40 dB) at 1000 Hz
High level inputs to Main Output 10 to 1 (20 dB)
High level inputs toTape Output 1 to 1 (0 dB)
Tape Monitor Input to Main Output: 10 to 1 (20 dB)
A.C. Aux. Outlets: 1 unswitched for tape machine or turntable, colored Red; 4 switched, colored Black
Power Requirements: 117 volts 60 Hz, A.C. 35 watts
Size: 15⅝" W x 5⅛" H. overall depth of chassis behind front panel is 12" The space required in front of cabinet panel for the thickness of the panel and knobs is 1¼".
Weight: Chassis only 18 pounds. In shipping carton 28,5 pounds.