Bi-amping and tri-amping

In the consumer electronics Bi -amping refers to the technology to be operated a speaker of two amplifiers, one amplifier takes care of the deep and the other to the high audio frequencies. Consequently, must provide an electrical transition between the preamp and power amp bi- amped system, so at this transition point the audio spectrum can be divided into two parts in order to be subsequently amplified separately can. Furthermore, the connected speaker via separate inputs for the low - and high-frequency audio signal parts must have.

It is recommended to use in bi-amping speakers, who does not install or a bridgeable crossover, since the splitting of the frequencies was carried out before the final stage. There are speaker manufacturers, the crossover block with bi-amping boxes behind the individual inputs to ensure that there are no low frequency signals to the tweeter or no high frequency signals from getting to the woofer. This passive crossovers also affect the incoming signal if it has been previously limited to a particular spectral region, and thus undermines the concerns of bi-amping.

Variants

The output stages are not necessarily stand-alone devices. At 7.1 receivers is often possible, instead of the surround back channels to use the amplifiers for the front speakers bi-amp operation, then as a 5.1 system.

Pros and Cons

Advantages are the increase in power and reserve capacity by the use of two amplifiers per speaker and some speakers the possible circumvention of the built-in passive crossover network. The latter allows a distortion poorer behavior of the overall system; also active crossovers are possible.

The disadvantage is that a possible fine-tuning of an active crossover experience and measurement tools requires, since the phase shift of the two amplifiers must match exactly.