Specifications - McIntosh C28 Owner's Manual

FREQUENCY RESPONSE:
+0, -0.5 dB 20 Hz to 20,000 Hz.
DISTORTION
Less than 0.1% at rated output level, 20 Hz
to 20,000 Hz.
INPUT SENSITIVITY AND IMPEDANCE:
Auxiliary, Tuner, Tape 1, Tape 2
Phono 1 and Phono 2
Microphone 2.5 millivolts at 500,000 ohms.
Tape Head 2 millivolts at 500,000 ohms (500 Hz).
HUM AND NOISE
Auxiliary, Tuner, Tape 1, and Tape 2
output.
Phono 1, Phono 2 and Tape Head
input, equivalent to less than 1.2 microvolts at the input ter-
minals.
Microphone less than 1.5 microvolts at the input terminals.
OUTPUT LEVEL AND IMPEDANCE:
Main Output 2.5 volts with rated input, less than 100 ohms
source impedance, to operate into 47,000 ohms or greater.
Tape Output 0.25 volts with rated input, less than 150 ohms
source impedance, to operate into 47,000 ohms or greater.
Headphone/Line Output
load or 2..5 volts into into 600 ohm line, less than 0.2 ohm
source impedance, level controls provided.
Center Channel Output
channels, to operate into 47,000 ohms or greater, level control
provided.
VOLTAGE AMPLIFICATION IN DECIBELS:
Auxiliary, Tuner, Tape 1 and Tape 2
to Main Output
to Tape Output
to Headphone/Line Output
Phone 1 and Phone 2 at 1 kHz
to Main Output
to Tape Output
To Headphone/Line Output
14
0.25 volts at 250,000 ohms.
2 millivolts at 47,000 ohms {1,000 Hz).
90 dB below rated
78 dB below 10 millivolts
maximum 0.75 volts into 8 ohm
1.25 volts with rated input to both
20 dB
0 dB
17.5 dB
62 dB
42 dB
59.5 dB

Specifications

Microphone
to Main Output
to Tape Output
to Headphone/Line Output
Tape Head at 500 Hz
to Main Output
to Tape Output
to Headphone/Line Output
POWER REQUIREMENT:
117 volts, 50/60 Hz, 45 watts.
BASS CONTROLS:
Separate 11 position rotary switches for each channel, +20 dB
to - 2 0 dB at 20 Hz.
TREBLE CONTROLS:
Separate 11 position rotary switches for each channel, +18 dB
to - 1 8 dB at 20 kHz.
COMPENSATION SWITCH:
Three position switch for Flat, Loudness, or Presence. Loud-
ness position boosts low frequencies for low level listening.
Presence position boosts mid frequencies 4 dB to increase
"presence" effect. This control operates as a function of vol-
ume control position so full compensation is obtained at lower
volume levels and flat response is obtained at full volume.
BALANCE CONTROL:
Natural balance at center position, attenuation of left or right
channel by rotating control.
VOLUME CONTROL:
Precision "tracked at all listening levels. (0 to —65 db). Does
not change stereo balance as loudness is changed. The power
ON/OFF switch is coupled with this control.
INPUT SELECTOR:
Six positions
phone, and Tape Head.
MODE SELECTOR:
Seven positions
60 dB
40dB
57.5 dB
64 dB
44 dB
61.5 dB
FACILITIES & FEATURES
Auxiliary, Tuner, Phono 1, Phono 2, Micro-
Left channel only to both speakers, Right