Crossovers handle the separation of sound frequencies, and handle their distribution to speakers. Passive crossovers built into speakers' cabinets are used in compact music systems. Active crossovers are separate components, and are connected between the sound source a mixer or preamp , and the amplifier. In professional audio applications, two amplifiers are used to create a bi-amped system.
Bridged and paralleled amplifiers
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There seems to be some confusion when it comes to installing more than one amplifier. Should you use one power wire or multiple wires? Do you ground everything to the same point? How do you split the low level signal?
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Wiring in one amplifier can be complicated enough, especially when you're dealing with a factory car stereo, and the situation just gets more complex when you add multiple amplifiers to the equation. You can wire two amplifiers, or even multiple amps, in one car audio system, but it takes some extra planning. The main factors that you need to consider when you wire in two or more amps are how you will deal with the power cable, grounding each amp, and whether or not the remote turn-on signal from your head unit is strong enough to split between multiple amps. The short answer is that you can use any number or combination of power amps in a car audio setup as long as you wire them in properly. The main proviso is that the charging system has to be able to provide enough juice in the first place.
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