1, according to the output power of choice
The power output of technical indicators, with the highest output power and rated output power, but the two output power with the load impedance, impedance smaller output power is greater, in the selection of power amplifier, this parameter is the main index.
2, according to a channel selection
There are two commonly used channel output (mainly used to promote about speaker, can also be bridging into a channel). Four channel output (mainly for the four channel signal output, the host through the power amplifier driving around the speaker, is convenient for the volume balance. The host adjustment around) Five channel output (four channel role ibid, another channel to promote the subwoofer, the space small place to be. One output (the power amplifier output power, mainly for the subwoofer. Promote the great power)
3, according to the function selection
Power amplifier of each brand, have their own functions, in accordance with these functions can be used in different circuit. For example: balanced input, high level input, bass boost control, variable lowpass / highpass filter, built-in equalizer, power indicator, BTL feeder, frequency response range, built-in electronic crossovers.