bi-amping: Use of two output stages (see final stage) on a pair of speakers. Everyone amplifier controls a range (middle / high tone or low tone). Since different amplifiers in Performance and sound quality differ, it is advisable to use a separate control precursor.
Exception:
If both amplifiers have the Pre-Out / Main-In connections, they can also be coupled with each other without a pre-amp. You connect all sound sources to an amplifier and connect the pre-out Connection to the main-in connection of the second amplifier.
Attention:
Please be sure Bi-wiring / bi-amping the minimumimpedance of the amplifier, otherwise there is a risk of short circuits!