Internal speaker produces tuning reference tone.
内置扬声器调整基准音调。
Active speaker amplifier installed in the internal speakers, amplifier less than a set of cases, the cost can be greatly reduced.
有源音箱的功放设置在音箱内部，比功放要少一套机壳，成本得以大幅降低。
Active speaker amplifier installed in the internal speakers, amplifier less than a set of cases, the cost can be greatly reduced.
有源音箱的功放设置在音箱内部，比功放要少一套机壳，成本得以大幅降低。
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