BiAmp or BiAmplified means using 2 amplifiers inside an electronic output device, like a speaker. When a speaker has a built-in amplifier, it is referred as active.
The idea of using a BiAmp circuit is to deliver better sound for lows and highs, using each amplifier toward a dedicated band of frequencies at the speaker's crossover - where lows turn to highs. Separating highs from lows via an active electronic crossover lets a bi-amped system use two different amplifiers. Each is free to drive just one transducer (driver) to its safe maximum limit without intermodulation distortion or other interaction between the two drivers.
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