Audio Database


McIntosh MC402 850,000yen(December 1, 2002 release)

Stereo power amplifier which adopted the double differential-amplifier circuit.

A balance amplifying circuit is constituted by making every two of four push pull signal circuits into a pair, and it consists of original double differential-amplifier circuits which re-unify an output by output auto FOMA of a final stage. Thereby, a signal system realizes a completely symmetrical balance transmit from an input to an output, and is reducing all the noises and distortion.
Furthermore, thorough sorting of the output transistor element is carried out, and the linearity is raised.

Output auto FOMA of mac tradition which is not concerned with the impedance of a speaker but can maintain a fixed operation is carried.
Moreover, the counter-electromotive force from a speaker was absorbed by this auto FOMA, and the distorted incrementation is prevented.

If the power guarding functionality is carried, the wave of an input and an output is always compared and the difference exceeds 0.3%, gain will be lowered automatically and distortion will be suppressed.

When the sentry monitor is carried and the output current and a voltage are likely to exceed a default value by output short-circuit or an unusually low load impedance, it lowers to safe level automatically and an outage is prevented.

If the temperature protection is carried and a sensor detects overheat, an input will be intercepted, and if a temperature falls, it will return automatically.

The rush current at the time of power activation is restricted, and the in rushes protection which eases the stress to a power circuit is carried.

A startup of amplifier is delayed for about 2 seconds at the time of power activation, and the turn-on delay which protects a speaker from a transient noise etc. is carried.

By DC protection, when a direct current component begins to leak to an output, output auto FOMA makes a grounding bypass and protects a speaker.

The power meter of MC402 measures not a simple signal-voltage meter but a voltage and an electric-current value, and displays the electrical-power value actually outputted to the speaker termination.
By a WATTS position, the peek power window with a slow recovery functionality is given, and in a HOLD position, it returns slowly, holding indicated value by the maximum peak level.
Moreover, LIGHTS OFF serves as a position which is a WATTS window and the back light switches off.

3 dimension design of 12mm heavy glass and the illumination panel using light emitting diode / optical diffusion fiber are adopted.

The stainless steel plate is adopted as a chassis and it has become a natural air cooling system by a large-sized heat sink.

The remote power control which can perform package on/off of a power source from the control amplifier made from a mac is carried.


Rating of a mode
Form Stereo power amplifier
Output power stereo: 400W+400W (2ohm, 4ohm, 8ohm)
mono parallel: 800W (1ohm, 2ohm, 4ohm)
Frequency characteristic 20Hz-20kHz+0 -0.25 dB
10Hz-100kHz+0 -3.0 dB
THD A maximum of 0.005% (250mW - Output power)
Cross modulation distortion A maximum of 0.005% (at the time of SMPTE and an Output power)
Input sensitivity/impedance Unbalance: 1.9V / 10kohm (with VR)
Balance: 3.8V / 20kohm (with VR)
SN ratio (A-criteria) Unbalance: 85dB
Balance: 115dB
Dumping factor 100 (8ohm)
Power guarding Prevention from clipping, THD <=2% (less than over-drive 14dB, 1kHz)
Power source AC100V, 50Hz/60 Hz, 12A (Underwriters Laboratories/CSA specification)
Dimensions Width 445x height 226x depth of 445mm
Weight 47.6kg