Performance Limits
PERFORMANCE GUARANTEE
Performance Limits are the maximum deviation
from perfection permitted for a Mclntosh instru-
ment. We promise you that when you purchase a
new MC 2155 from a Mclntosh franchised dealer, it
will be capable of or can be made capable of perfor-
mance at or exceeding these limits or you can return
the unit and get your money back. Mclntosh is the
only manufacturer that makes this statement.
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
150 watts minimum sine wave continuous average
power output, per channel, both channels operating
into 1 ohm, 2 ohms, 4 ohms, or 8 ohms load im-
pedance, which is:
12.2 volts RMS across 1 ohm
17.3 volts RMS across 2 ohms
24.5 volts RMS across 4 ohms
34.6 volts RMS across 8 ohms
MONO
300 watts minimum sine wave continuous average
power output into 0.5 ohm, 1 ohm, 2 ohms, 4 ohms, 8
ohms, or 16 ohms load impedance, which is:
12.2 volts RMS across 0.5 ohm
17.3 volts RMS across 1 ohm
24.5 volts RMS across 2 ohms
34.6 volts RMS across 4 ohms
49.0 volts RMS across 8 ohms
69.3 volts RMS across 16 ohms
OUTPUT LOAD IMPEDANCE
STEREO
1 ohm, 2 ohms, 4 ohms, and 8 ohms; separate ter-
minals are provided for each output.
MONO-PARALLEL
0.5 ohm, 1 ohm, 2 ohms, and 4 ohms; obtained by
connecting together the appropriate terminals of
both channels.
MONO-BRIDGED
2 ohms, 4 ohms, 8 ohms, or 16 ohms, balanced to
common connections.
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 150 watts from 20 Hz to
20,000 Hz both channels operating.
MONO
0.02% maximum harmonic distortion at any power
level from 250 milliwatts to 300 watts from 20 Hz to
20,000 Hz.
INTERMODULATION DISTORTION
STEREO
0.02% maximum if instantaneous peak power out-
put is 300 watts or less per channel with both chan-
nels operating for any combination of frequencies.
20 Hz to 20,000 Hz.
MONO
0.02% maximum if instananeous peak power output
is 600 watts or less for any combination of frequen-
cies, 20 Hz to 20,000 Hz.
FREQUENCY RESPONSE (at one watt output)
20 Hz to 20,00 Hz +0 -0.25 dB.
10 Hz to 100,000 Hz + 0.25 - 1 dB.
NOISE AND HUM
95 dB below rated output.
RATINGS
DAMPING FACTOR
Greater than 30
INPUT IMPEDANCE
50,000 ohms.
INPUT SENSITIVITY
Switchable: 0.75 volt or 2.5 volts—level control pro-
vided for higher input voltages.
POWER GUARD
Clipping is prevented and THD does not exceed 2%
with up to 20 dB overdrive at 1 kHz.
GENERAL INFORMATION
POWER REQUIREMENTS
120 volts 50/60 Hz 0.7 to 12 amps.
SEMICONDUCTOR COMPLEMENT
81 silicon transistors
47 silicon rectifiers and diodes
14 integrated circuits
MECHANICAL INFORMATION
SIZE
Front panel measures 16 inches wide (40.6 cm) by
5-7/16 inches high (13.8 cm). Chassis measures 15 in-
ches wide (38.1 cm) by 5 inches high (12.7 cm) by
14-1/2 inches deep (36.8 cm), including connectors.
Knob clearance required is 1-1/2 inches (3.8 cm) in
front of mounting panel.
FINISH
Front panel is anodized gold and black with special
gold/teal nomenclature illumination. Chassis is
chrome and black
WEIGHT
65 pounds (29.5 kg) net, 77 pounds (35 kg) in shipping
carton.
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