McIntosh MC-402 Brochure

MC402
Power Amplifier

“unique differential design

cancels noise and distortion”

Producing a minimum 400 watts per channel in stereo, 800 watts in
mono, the MC402 delivers power that is fully balanced from input to
speaker output. The extraordinary quad-differential design of the MC402
actually consists of four complete amplifier circuits. Each channel
contains two amplifier circuits, each the mirror image of the other, whose
outputs are combined in the unique McIntosh Output Autoformer)
resulting in totally balanced operation from input to speaker output and
the cancellation of virtually all noise and distortion.

The exclusive McIntosh Output Autoformer) is a handcrafted matching
device that provides an ideal impedance match for all speaker types
regardless of their rated impedance. Any departure from an optimum
impedance match increases stress on the amplifier which threatens a
rise in distortion as well as a reduction in the life expectancy of the
amplifier. McIntosh Output Autoformers) enable the MC402 to operate
at maximum efficiency and to always deliver full power, without stress, to
any type of loudspeaker.

Fully Balanced Differential Design
New 3D Glass Panel Design
Exclusive McIntosh Output Autoformer&
Exclusive McIntosh Power Assurance System

Power Guard& Clipping Protection
Sentry Monitor& Current Protection
Thermal Sensors
DC Failure Protection
Turn-On Delay

Soft Start Inrush Protection
Fiber-Optic Light Diffuser Illumination
Illuminated Peak-Responding Wattmeters
Balanced Connections
Remote Power Control

McIntosh Laboratory, Inc. 2 Chambers Street, Binghamton, New York 13903-2699

Tel [phone] • US Toll-Free [phone] • Fax: [phone]• www.mcintoshlabs.com

For the Consumer’s Protection: In order to ensure the highest level of customer satisfaction, “new” McIntosh
products may only be purchased over-the-counter or delivered and installed by an Authorized McIntosh Dealer.
McIntosh products that are purchased over the Internet, by phone or mail order are presumed to be “used” and
do not qualify for any McIntosh Warranty. McIntosh does not warrant, in any way, products that are purchased
from anyone who is not an Authorized Dealer or products that have had their serial number altered or defaced.

MC402

Power Amplifier

EXCLUSIVE MCINTOSH POWER

ASSURANCE SYSTEM

A collection of technologies

that enhance performance

and reliability and protect

the amp and loudspeakers.

Power Guard

A waveform comparison circuit

continuously monitors both input

and output signals. If any

difference is detected, Power

Guard dynamically adjusts the

input level to ensure maximum

power output while preventing

harsh sounding clipping distortion.

Sentry Monitor

Current protection continually

senses the voltage and current of

the output stage and confines it to

a safe limit, without limiting

power output.

DC Failure Protection

Protects speakers against output
circuit failure. Any DC current that
appears in the output is shunted to

ground by the output autoformer.

Thermal Sensors

Protects against overheating if

cooling air is blocked and output

transistors become too hot.

Turn-on Delay

Delays operation for about two

seconds after turn-on, to silence

any pops or thumps generated by

other equipment.

FREQUENCY RESPONSE

20Hz to 20kHz, +0 / -0.25dB
10Hz to 100kHz, +0 / -3.0dB

TOTAL HARMONIC DISTORTION

0.005% max. at any level from
250mW to rated power output

INTERMODULATION DISTORTION

SMPTE 0.005% maximum if
instantaneous peak output does
not exceed twice the output rating

A-WEIGHTED SIGNAL-TO-NOISE RATIO

Unbalanced: 94dB

(120dB below rated output)

Balanced: 98dB

(124dB below rated output)

RMS POWER OUTPUT

400W min. (stereo) or 800W min.
(mono) sine wave continuous
average power output from 20Hz­20,000Hz

INPUT IMPEDANCE

10,000 ohms (unbalanced)
20,000 ohms (balanced)

OUTPUT LOAD IMPEDANCE

Terminals for 8, 4, or 2 ohms

(stereo)

Terminals for 1, 2, or 4 ohms

(mono)

INPUT SENSITIVITY

2.0V unbalanced

4.0V balanced

WIDE BAND DAMPING FACTOR

Greater than 40

DYNAMIC HEADROOM

2.1dB

RATED POWER BAND

20Hz to 20kHz

POWER GUARD&

Clipping is prevented and THD does
not exceed 2% with up to14dB
overdrive at 1kHz

POWER REQUIREMENTS

120V 50/60Hz, 10A

OVERALL DIMENSIONS (H X W X D)

17 1.2 (44.45 cm) x 9 7/16 (23.97
cm) x 20 (50.8 cm)

WEIGHT

110.5 lbs. (50.1kg) net

143.5 lbs. (65.1kg) boxed

Fully balanced differential design

400 watts (stereo) or 800 watts (mono parallel)

High output current capability (>100 amps)

Balanced and unbalanced inputs
Exclusive McIntosh Output Autoformer)

Wide power bandwidth, low distortion

Exclusive McIntosh Power Assurance System

Illuminated peak-responding, true-reading

watt meter with hold

Fiber optic light diffuser illumination for front panel

nomenclature

Remote power control

Massive gold-plated five-way output binding posts

Fanless convection cooling

Modular construction with stainless steel chassis

with super mirror finish

1/2"-thick glass front panel with illuminated nomenclature

Soft Start Inrush Protection

Eliminates component stress

during turn-on. Thermistors in the

power transformer act as a

cushion against inrush current.

12.02.MC402.20k.JCP 35005200