Performance Limits And Ratings - McIntosh C27 Owner's Manual

Performance Limits and Ratings

PERFORMANCE LIMITS are the maximum deviation from
perfection permitted for a Mclntosh instrument. We promise
you that your C 27 must be capable of performance at or
exceeding these limits or you get your money back. Mc-
lntosh is the only manufacturer that makes this guarantee.
FREQUENCY RESPONSE
+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
to MAIN OUTPUT 20 dB
to TAPE OUTPUT 0 dB
PHONO 1 and 2
to MAIN OUTPUT 62 dB
to TAPE OUTPUT 42 dB
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.
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
TAPE MONITOR
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.
HEADPHONE JACK
For low impedance headphones; powered by properly in-
terconnected external power amplifier.
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