Audio power amplifiers for audio amplifier, also known as, which is mainly composed of pre grade level, tone, power amplifier stage which consists of several parts, as shown in Figure 1. Pre orders of magnitude are small high input impedance, output impedance, wide bandwidth, low noise; pitch-level role is to adjust the input signal, increasing the input signal and decay; and power amplifier is an audio amplifier's main parts, which determines the power output the size of the required output with high efficiency, high output power characteristics. PA as a whole, requiring that their low distortion, low noise, good amplification.gprservice manual download site
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In recent decades, class a, class b, class AB audio power amplifier (rated output power) has been "ruled" status, used in devices from vacuum tubes, transistors, to integrated circuits; circuits from single to push-pull circuit; circuits from the transformer to the OTL, OCL, BTL. The biggest drawback of this type of amplifier is inefficient: maximum efficiency for class a audio power amplifier 50% 78.5%, b the maximum efficiency of audio power amplifiers, class AB audio power amplifier efficiency is somewhere in between. But either category a, category b or a class AB audio power amplifier, as their output power is less than the rated value, efficiency will be significantly lower in the dynamic language, music is playing, the average efficiency of only about 30%.gprservice manual download site
In recent years, with the development of digital audio technology, efficiency is very high (theoretically could reach 100%) class d amplifier has emerged, and a wide range of applications.gprservice manual download site
Tip: BTL (Bridge-Tied-load) meaning bridged load. Both ends of the load connected to the output of two amplifiers side, a new amplifier is an amplifier of the mirrored output, meaning that adds a load both sides only differ by 180 ° on the phase of the signal, the load will be given twice times the originally single-ended output voltage, the theoretical power output for dual-channel output 4 times.

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