McIntosh MC 2125 Service Manual

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MC 2125

POWER AMPLIFIER

SERVICE INFORMATION

STARTING WITH SERIAL NC). AZIODI

McINTOSH LABORATORY INC. BINGHAMTONI NEW YORK 13903

038-888

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MC2125

PERFORMANCE

'- PERFORMANCE %

McIntosh audio power ratings are in ac~
cordance with the Federal Trade Commis-
sion Regulation of November A, 197A con-
cerning power output clains for ampli-
fiers used in home entertainment pro»
ducts.

POWER OUTPUT

STEREO: 120 watts minimum
sine wave continuous aver-
age power output, per chan-
nel, both channels operating
into 2 ohms, A 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 pow-
er output into 1 ohm, 2 ohms,
A ohms, or 8 ohms load im-
pedance, 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, A ohms,
and 8 ohms; obtained by conn-
ecting together appropriate
terminals of both channels.

RATED POWER BAND
20 HZ to 20,000 Hz

TOTAL HARMONIC DISTORTION

STEREO: 0.1% maximum harmon-
ic distortion at any power
level from 150 milliwatts to
120 watts per channel from
20 Hz to 20,000 Hz, both
channels operating

LIMITS 8 RATINGS

MONO: 0.1% maximum harmonic
distortion at any power lev-
el from 150 milliwatts to
2A0 watts from 20 Hz to
20,000 Hz

INTERMODULATION DISTORTION

STEREO: 0.1, maximum it instantaneous
peak power output is 2A0 watts or less
per channel with both channels opera-

ting for any conbination of frequen-
cies, 20 H/ to 20,000 Hz

MONO: 0.1 maximum ii instantaneous
peak power output is 580 watts or less

for any combination of frequencies.
70 HZ to 20,000 H/

FREQUENCY RESPONSE

(aL one watt output)

20 H2 lo 20,000 Hz, +0 -0.25 dB
10 Hz to 100,000 Hz, +0 -.0 dB

NOISE AND HUM

9SdB below rated output

,- RATINGS -,

OUTPUT VOLTAGES

25 volts For distribution lines

DAMPING FACTOR
STEREO: 16 at 2 ohms output. 50 at h
ohms output, 20 at 8 ohms output, IA
at 16 ohms output

MONO: 16 at 1 ohm. 50 at 2 ohms, 20
at A ohms, and 1% at 8 ohms output

INPUT IMPEDANCE
100,000 ohms

INPUT SENSITIVITY

Switchable; 0.75 volt or 2.5 volts-
Level control provided for higher in-
put voltages

POWER REQUIREMENTS

120 volts 50/60 Hz, 50 watts at zero
signal output, #60 watts at rated out-
put

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