在低音喇叭的上方是一个音量控制器和本身的主要基地单位，收费的其他发言者。

The woofer's top is a volume controller and itself is the main base unit that charges the other speakers.

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音量以分贝作为衡量单位。

Loudness is measured in units called decibels.

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分贝：量度相对音量的单位。

Decibe: a unit for measuring relative intensities of sounds.

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分贝：量度相对音量的单位。

Decibe: a unit for measuring relative intensities of sounds.

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