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MC2255
Commentary

This is a stereo power amplifier developed by the Macintosh to realize the policy of "better sound longer" more surely.

Equipped with a unique power guard mechanism.
A waveform comparison circuit is built into the circuit to compare the waveform states of the input and output signals. When the harmonic 歪総 reaches 0.5% or more, the input is restricted to prevent clipping, and the speaker is protected safely.

Equipped with a self-diagnosis device, the circuit is divided into seven circuits and automatically checked. If there is a problem, the output to the speakers is automatically stopped until repair is done, preventing naming due to excessive operation.

By adopting an output transformer originally developed by Macintosh, impedance matching is greatly improved, and the power transistor can be operated at a temperature about 20 ℃ lower than that of a normal amplifier.
As a result, a large output can be obtained with a sufficient margin, extending the time when the system can demonstrate its ability.

Model Rating
Type Stereo power amplifier
Effective power Stereo : 250W + 250W (1 Ω ~ 8 Ω)
Mono : 500W (0.5 Ω ~ 16 Ω)
Input Sensitivity / Impedance 750 mv, 2.5V/50k Ω (Switchable)
Input level adjustment Left and right independent continuous variable
Total harmonic distortion factor 0.02% (0.25W ~ Effective Output, 20 Hz ~ 20 kHz)
Cross modulation distortion factor 0.02% (0.25W ~ Effective Output, 20 Hz ~ 20 kHz)
Frequency characteristic 20 Hz ~ 20 kHz + 0 -0.25 dB
Signal-to-noise ratio 95dB
Damping factor 30 or more
Power Guard 2% or Less (1 kHz, 20 dB)
Pwer 100 VAC, 50Hz/60Hz
Power consumption 1.4 kw (at effective output)
External dimensions Width 411x Height 181x Depth 368 mm
Weight 37.2kg