A total of 36 power devices in 9 parallel units are used in the output stage. The power stage operates stably by the output lance, and heat generation is reduced by a large heat sink and automatic tracking and bias circuit. In addition, a low-noise heat radiation fan of 2 speed operates when high-power operation is continued for a long time, and low-temperature operation is achieved. In addition, an automatic recovery type power breaker is built in in case of overheating.

In order to cope with excessive input exceeding the clipping output, it is equipped with a Power Guard System unique to Macintosh, and the gain is automatically reduced when excessive input is made. In addition, the Sentry Monitor system controls the output current against excessive current such as output short.

The circuit is equipped with a new Macintosh circuit that does not generate crossover distortion, a balanced amplifier, strict impedance distribution for each stage, and careful examination of constituent parts. This realizes a low distortion factor even in the minute output region despite being a large output amplifier.

A high-current capacity gold-plated terminal is used for the output terminal.