功能特点：
1）具备4路主功放和1路后备功放输入通道，供4台主功放和1台后备功放自动检测切换。
2）自动检测声频功放并在主功放和后备功放之间自动切换。
3）具有手动切换主功放和后备功放的功能。
Function/Feature:
1) have the four sets of main power amplifier and 1 auxiliary power amplifier signal input channel, can choose to use.
2) automatic detection audio power amplifier power amplifier and spare in the Lord between power amplifier automatic Switching.
3) has the switch power amplifier and backup power amplifier functions.
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