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Bridge-tied load
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Bridge-tied load : ウィキペディア英語版
Bridge-tied load

A bridge-tied load (BTL), also known as bridged transformerless and bridged mono, is an output configuration for audio amplifiers, a form of impedance bridging used mainly in professional audio & car applications. The two channels of a stereo amplifier are fed the same monaural audio signal, with one channel's electrical polarity reversed. A loudspeaker is connected between the two amplifier outputs, ''bridging'' the output terminals. This doubles the available voltage swing at the load compared with the same amplifier used without bridging. The configuration is most often used for subwoofers.
==Power output==

The available voltage swing across the load is doubled for the same power supply voltage, but the maximum current output ability of the amplifier remains the same. Consequently operating a pair of existing amplifier channels in bridge mode doubles available power output to the load. The BTL load needs to be twice the impedance since it sees twice the voltage at the same current.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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