+0 -0.5 dB 20 Hz to 20k Hz DISTORTION Will not exceed 0.05% at rated output level, 20 Hz to 20k Hz INPUT SENSITIVITY AND IMPEDANCE AUXILIARY i and 2, TUNER, TAPE 1 and 2: 250 millivolts at 100k ohms. PHONO 1 and 2: 2 millivolts at 47k ohms and 100 pF. HUM AND NOISE AUXILIARY 1 and 2, TUNER, TAPE 1 and 2: 85 dB un- weighted; 90 dB IHF A weighted. PHONO 1 and 2: 80 dB below 10 mV input, unweighted; 85 dB IHF A weighted. OUTPUT LEVEL AND IMPEDANCE MAIN OUTPUT 2.5 volts with rated input, less than 1k ohms source impedance, to operate into 22k ohms load or higher. Maximum output is greater than 10 volts TAPE OUTPUT 0.25 volts with rated input, less than 1.5k ohms source impedance, to operate into 22k ohms load or higher. Maximum output is greater than 10 volts CENTER CHANNEL OUTPUT (L + R) 2.5 volts with rated input to both channels, less than 1.2k ohms source im- pedance, to operate into 22k ohms load or higher. VOLTAGE AMPLIFICATION IN DECIBELS AUXILIARY 1 and 2, TUNER, TAPE 1 and 2
MOUNTING: Exclusive Mclntosh developed professional PANLOC.
WEIGHT: 20 pounds (9.1 kg) net, 32 pounds (14.5 kg) in shipping carton.
FACILITIES AND FEATURES
BASS Separate 11 position rotary switches for each channel. -17 dB to +16 dB at 20 Hz
TREBLE Separate 11 position rotary switches for each channel -20 dB to +20 dB at 20k Hz
LOUDNESS Flat response, or continuously variable loudness equaliza- tion.
BALANCE Natural balance at center position, attenuation of left or right channel by rotating control
VOLUME Precision step attenuator with matched elements for proper tracking at all listening levels. Does not change stereo balance as volume is changed.
INPUT Five positions—AUXILIARY 1 and 2, TUNER, PHONO 1 and 2
MODE 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
Two pushbutton switches. Either of two tape recorders can be monitored. They are mechanically interlocked to accept only one pushbutton at the IN position at one time
TAPE COPY SWITCH Two pushbutton switches. Either of two tape recorders can
be connected to copy from one to the other or vice versa. They are mechanically interlocked to accept only one pushbutton at the IN position at one time.
LF FILTER (Rumble Filter) Flat or roll-off 12 dB per octave below 50 Hz, down 12 dB at 20 Hz
HF FILTER (Scratch Filter) Flat or roll-off 12 dB per octave above 5k Hz. down 12 dB at 20 k Hz
SPEAKER SWITCH Facilities are provided to connect the power amplifier to the rear panel of the C 27 to permit switching two pairs of speakers on and off.
HEADPHONEJACK For low impedance headphones; powered by properly in- terconnected external power amplifier.
to MAIN OUTPUT to TAPE OUTPUT PHONO 1 and 2 to MAIN OUTPUT to TAPE OUTPUT SEMICONDUCTOR COMPLEMENT
18 Silicon—Planar transistors 4 Silicon Diodes 5 Light Emitting diodes AC POWER OUTLETS
1 unswitched (Red) 4 switched POWER REQUIREMENT 120 volts, 50/60 Hz, 15 watts MECHANICAL INFORMATION
SIZE: Front Panel measures 16 inches wide (40.6 cm) by 5 7/16 inches high (13.8 cm). Chassis measures 14 3/4 in- ches wide (37.5 cm) by 4 13/16 inches high (12.2 cm) by 13 inches deep (30.0 cm), including PANLOC shelf and back panel connectors. Knob clearance required is 1 1/4 inches (3.2 cm) in front of the mounting panel.
FINISH: Front panel is anodized gold and black with special Mclntosh gold/teal panel nomenclature illumina- tion. Chassis is black.