McIntosh MC 7270, Owner'S Manual

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PERFORMANCE GUARANTEE
Performance Limits are the maximum deviation from
perfection permitted for a Mclntosh instrument. We pro-
mise you that when you purchase a new MC 7270 from a
Mclntosh franchised dealer, it will be capable of or can be
made capable of performance at or exceeding these limits
or you can return the unit and get your money back.
Mclntosh is the only manufacturer that makes this state-
ment.
PERFORMANCE
Mclntosh audio power ratings are in accordance with
the Federal Trade Commission Regulation of November 4,
1974 concerning power output claims for amplifiers used
in home entertainment products.
POWER OUTPUT
STEREO
270 watts minimum sine wave continuous average power
output, per channel, both channels operating into 1 ohm,
2 ohms, 4 ohms, or 8 ohms load impedance, which is:
16.4 volts RMS across 1 ohm
23.2 volts RMS across 2 ohms
32.9 volts RMS across 4 ohms
46.5 volts RMS across 8 ohms
MONO-BRIDGE
540 watts minimum sine wave continuous average
power output into 2 ohms, 4 ohms, 8 ohms, or 16 ohms
load impedance, which is:
32.9 volts RMS across 2 ohms
46.5 volts RMS across 4 ohms
65.7 volts RMS across 8 ohms
93.0 volts RMS across 16 ohms
OUTPUT LOAD IMPEDANCE
STEREO
1 ohm, 2 ohms, 4 ohms, and 8 ohms; separate terminals
are provided for each output.
MONO-BRIDGED
2 ohms, 4 ohms, 8 ohms, or 16 ohms, balanced to
ground.
RATED POWER BAND
20 Hz to 20,000 Hz
TOTAL HARMONIC DISTORTION
STEREO
0.02% maximum harmonic distortion at any power level
from 250 milliwatts to 270 watts per channel from 20 Hz
to 20,000 Hz, both channels operating.
MONO
0.02% maximum harmonic distortion at any power level
from 250 milliwatts to 540 watts from 20 Hz to 20,000
Hz.
INTERMODULATION DISTORTION
STEREO
0.02% maximum if instantaneous peak power
output is 540 watts or less per channel with both
channels operating for any combination of fre-
quencies, 20 Hz to 20,000 Hz,
MONO
0.02% maximum if instantaneous peak power
output is 1080 watts or less for any combination of
frequencies, 20 Hz to 20,000 Hz.
FREQUENCY RESPONSE (AT ONE WATT OUTPUT)
20 Hz to 20,000 Hz +0 -0.25 dB.
10 Hz to 100,00 Hz +0 - 2 dB.
NOISE AND HUM
100 dB below rated output.
RATINGS
DAMPING FACTOR
Greater than 30
INPUT IMPEDANCE
20,000 ohms.
INPUT SENSITIVITY
Switchable: 0.75 volt or 2.5 volts-level control provided
for higher input voltages.
POWER GUARD
Clipping is prevented and THD does not exceed 2% with
up to 20 dB overdrive a 1 kHz.
GENERAL INFORMATION
POWER REQUIREMENTS
120 volts 50/60 Hz; 13 amps.
SEMICONDUCTOR COMPLEMENT
79 silicon transistors
31 silicon rectifiers and diodes
7 integrated circuits
MECHANICAL INFORMATION
SIZE
16 3/16 inches wide (41.1 cm) by 7 1/8 inches high (18.1
cm) by 14 1/2 inches deep (36.8 cm), including connec-
tors. Knob clearance required is 1 1/4 inches (3.2 cm) in
front of mounting panel.
FINISH
The front panel is a combination of glass and black
anodized aluminum. The chassis is black.
WEIGHT
82 pounds (37.2 kg) net, 96 pounds (43.5 kg) in shipping
carton.
14 PERFORMANCE LIMITS