User manual MCINTOSH C32

[. . . ] THE MclNTOSH C32 SOLID STATE STEREO PREAMPLIFIER Reading Time: 44 Minutes Price $1. 25 WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE. The Mclntosh you have purchased has a serial number located on the rear panel of the chassis. Record that serial number here for future references. The model and serial number are important to you for any future service. Your C 32 Stereo Preamplifier will give you many years of pleasant and satisfactory performance. If you have any questions, please contact: Contents INTRODUCTION HOW TO INSTALL HOW TO CONNECT USING THE FRONT PANEL CONTROLS USING THE PUSHBUTTONS BALANCING YOUR STEREO LISTENING TO YOUR STEREO PERFORMANCE LIMITS AND RATINGS PERFORMANCE CHARTS TECHNICAL DESCRIPTION BLOCK DIAGRAM 2 2 4 8 11 12 12 13 14, 15 16 19 CUSTOMER SERVICE Mclntosh Laboratory Inc. [. . . ] The charts show the action of the EXPANDER CIRCUIT. When rotated fully counterclockwise, the front panel EXPANDER knob activates a switch which completely by-passes all EXPANDER circuitry. The LEVEL MATCH control on the top panel of the C 32 adjusts the set level. This is the point above and below which expansion is introduced when the EXPANDER knob is turned clockwise. Set the LEVEL MATCH controls for each channel while listening to a program. The average sound level of the system should be the same with the EXPANDER knob in the desired position of EXPANSION as it is in the bypass (OFF) position. 9 A. To reduce noise (hum, hiss or scratch) 1. Select the desired program source with LISTEN front panel selector switch. Increase VOLUME control during a quiet passage of the program until noise is clearly audible. Rotate EXPANDER control clockwise until the noise is acceptably reduced. To improve the "live" sound of recorded or transmitted program material: 1. Rotate the EXPANDER control clockwise until the dynamic range of the music, the ratio of loud to soft is correct for you. Adjust the LEVEL MATCH controls as described previously. By using the EXPANDER controls in conjunction with the EQUALIZER FREQUENCY controls, the C 32 may be used to de-emphasize and decompress disc and tape program material. HEADPHONE Jacks The stereo HEADPHONE jacks are driven by the built-in MONITOR AMPLIFIER. Either LISTEN or RECORD programs can be heard depending on the position of the INPUT switch on the MONITOR AMPLIFIER located on the top panel. The LEFT and RIGHT GAIN controls regulate headphone volume: A. In conjunction with the main front panel VOLUME control if the top panel INPUT switch is in LISTEN position, B. Exclusively if the INPUT switch is in RECORD position. The upper HEADPHONE jack is used to feed electrostatic headphones. It is fed directly by the MONITOR AMPLIFIER. Electrostatic headphones require more power than dynamic type headphones as a rule. [. . . ] The upper HEADPHONE output jack is connected directly to this MONITOR AMPLIFIER output, making the full 12 watts per channel power available to drive those headphones which require it. The lower HEADPHONE jack is fed through a network designed to match low impedance dynamic headphones. In addition, the MONITOR AMPLIFIER may be switched to either program line, controlled and connected with enough flexibility that several other uses for it are possible. As a preamplifier/power amplifier in a completely separate stereo system. [. . . ]