Performance Limits and Ratings
PERFORMANCE GUARANTEE
Performance Limits are the
maximum
deviation
from
per-
fection permitted for
a
Mclntosh instrument.
We promise
you that the MC 2120 you buy must
be capable
of
per-
formance
at or exceeding these limits or you get
your
money back. Mclntosh is the only manufacturer that makes
this guarantee.
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
120 watts minimum sine wave continuous
average power output per channel, both
channels operating into 2 ohms, 4 ohms, 8
ohms, or 16 ohms load impedance, which is:
15.5 volts RMS across 2 ohms
21.9 volts RMS across 4 ohms
31.0 volts RMS across 8 ohms
43.8 volts RMS across 16 ohms
MONO
240 watts minimum sine wave continuous
average power output into 1 ohm, 2
ohms, 4 ohms, or 8 ohms load impedance,
which is:
15.5 volts RMS across 1 ohm
21.9 volts RMS across 2 ohms
31.0 volts RMS across 4 ohms
43.8 volts RMS across 8 ohms
OUTPUT LOAD IMPEDANCE
STEREO
2 ohms, 4 ohms, 8 ohms, and 16 ohms;
separate terminals are provided for each
output
MONO
1 ohm, 2 ohms, 4 ohms, and 8 ohms; ob-
tained by connecting together the appro-
priate terminals of both channels
RATED POWER BAND
20 Hz to 20,000 Hz
TOTAL HARMONIC DISTORTION
STEREO
0.1% maximum harmonic distortion
at any
power level from 250 milliwatts to 120
watts per
channel from 20
Hz
to 20,000
Hz, both channels operating
MONO
0.1% maximum
harmonic
distortion at any
power level from 250 milliwatts to 240
watts from 20 Hz to 20,000 Hz
INTERMODULATION DISTORTION
STEREO
0.1% maximum if instantaneous peak power output is 240
watts or less per channel with both channels operating for
any combination of frequencies, 20 Hz to 20,000 Hz
MONO
0.1% maximum if instantaneous peak power output is 480
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 100,000
Hz
+0 -3.0 dB
NOISE AND HUM
95 dB below rated output
RATINGS
OUTPUT VOLTAGES
25 volts for distribution lines
DAMPING FACTOR
STEREO
16 at 2 ohms output, 50 at 4 ohms output, 20 at 8 ohms
output, 14 at 16 ohms output
MONO
16 at 1 ohm, 50 at 2 ohms, 20 at 4 ohms, and 14 at 8
ohms output
INPUT IMPEDANCE
100,000 ohms
INPUT SENSITIVITY
Switchable: 0.75 volt or 2.5 volts—Level control provided
for higher input voltages.
GENERAL INFORMATION
POWER REQUIREMENTS
120 volts 50/60 Hz, 50 watts at zero signal output, 460
watts at rated output
SEMICONDUCTOR COMPLEMENT
39 silicon transistors
24 silicon rectifiers and diodes
2 integrated circuits
MECHANICAL INFORMATION
SIZE
Front panel measures 16 inches wide (40.7 cm) by 5 7/32
inches high (13.2 cm). Chassis measures 14 5/8 inches
wide (37.2 cm) by 5 inches high (12.7 cm) by 13 inches
deep (33 cm), including connectors. Knob clearance re-
quired is 1 1/2 inches (3.8 cm) in front of mounting panel
FINISH
Front panel is anodized gold. Chassis is chrome and black
WEIGHT
57 pounds (25.9 kg) net, 70 pounds (31.8 kg) in shipping
carton
11
www.freeservicemanuals.info
5/10/2017
Digitized in Heiloo Netherland
