Definitions for "Class AB"
Basically a Class B power amplifier in which the positive and negative output devices never completely shut off, leaving a residual Class A activity at low signal levels and to smooth the transition from one polarity to the other. Less efficient, and therefore hotter, than Class B, but much cooler running than Class A. The most common form of power amplification. See: Class A, Class B.
Larger Heat-Sink at 20% larger than before, the produts effectively allows the amplifiers to withstand high volumes of current for extended hours of use with greater stability. With New Circuit Board Design that will withstand vibration that are caused by higher current and power output.
Most amps operate in Class A for the first fraction of a watt and Class B thereafter.
Class B Class H