![]() This being the most efficient mode of linear amplifier operation, the total power consumption of the MC 2255 from the 120-volt a.c. ![]() ![]() The output stages of the MC 2255 operate in class-B, but a unique biasing system completely eliminates the crossover distortion usually associated with class-B operation. Thus, regardless of the speaker impedance, the output transistors are optimally loaded and can deliver their full power without excessive distortion or overheating. Like vacuum-tube amplifiers, the MC 2255 has output terminals designated for 1, 2, 4, or 8 ohms. The unusual load capabilities of the MC 2255 derive from the use of large autotransformers to match the output transistors to their loads. Depending on the connection used, the mono load impedance can be from 0.5 to 16 ohms. Its stereo outputs may be paralleled or bridged to drive a mono load with a maximum output of 500 watts at 0.02 per cent distortion. The McIntosh MC 2255 basic power amplifier is rated to deliver its output into loads of 1, 2, 4, or 8 ohms, from 20 to 20,000 Hz, with no more than 0.02 per cent harmonic or intermodulation distortion.
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