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当我们要求喇叭可以高音量播放时，我们不需使用大尺寸的低音喇叭，而是用几个小巧的来代替。
When we require that a speaker should be able to play very loud we do not use large woofers, but several small ones instead.
这个低音扩音器的磁铁至少是普通喇叭的两倍大。
The woofer's magnet is at least twice as big as those used in ordinary active subwoofers.
案例四。 从中国供应商那里买了一套低音泡，不幸的是，小喇叭的声音却比大喇叭大的多。
Subwoofer sample bought, unfortunately a normal small loudspeaker has more sound than this Subwoofer, again 250$ in the air.
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