Bridging wordt vooral gebruikt bij PA-systemen (professionele audio/versterking). Hieronder de engelstalige uitleg uit het Yamaha Sound Reinforcement Handbook:
When a power amplifier is bridged, both amplifier channels are fed the same signal (usually from the left input), but the signal polarity of one channel (usually the right channel) is reversed relative to the other channel. Both halves of the stereo amplifier then process the same signal, and the load is connected so as to draw power from both channels. The amplifier effectively becomes a single channel unit, even though both channels are used - hence the term mono.
Note that the load is connected across the two hot output terminals. The left channel output is normally the positive connection, the right is the negative. The load is thus driver in a push-pull mode, and the RMS voltage across it, for a given input signal level, is effectively double what it would be if the load were connected across one channel only.
Dus idealiter sluit je de + van de speaker aan op de + uitgang van het Linker kanaal en de - van de speaker op de + uitgang van het Rechter kanaal.
Note that the specification above gives mono output power for 8 ohms only. This is because the minimum allowable load impedance in bridged mode is typically double the minimum impedance for a single channel: 8 ohms in bridge is 4 ohm/channel in stereo. Because the output voltage is doubled, impedance is quadrupled (power is proportional to the square of the voltage). While the amplifier can deliver the voltage, its power supply, heat sinks, fuses and output transistors typically cannot sustain the current that would probably cause the amplifier distortion to rise significantly, the amp could current limit early, and it might well fail or destry the loudspeaker. Thus the theoretical 4x power increase due to doubled voltage becomed a practical 2x power increase due to the doubled minimum impedance restriction in bridged mode.
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