左：早期四喇叭系统，日期和国籍不明。
Left: an early four-horn system, date and nationality unknown.
如果是喇叭系统，要达到类似的表现水平，代价要10倍于此。
To get a similar level of performance from speakers would cost 10 times as much.
如果是喇叭系统，要达到类似的表现水平，代价要10倍于此。
To get a similar level of performance from speakers would cost 10 times as much.
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