4-zone multiroom amplifier. This means that for all 5 entries, you select (direct) to which zone it will "play". Thus, in each zone (there are 4 monaural zones with a power of 60 W each) "plays" a different signal. This is especially appreciated by owners of guesthouses, restaurants and other social spaces, where each zone is required to transmit a different signal. E.g. modern music in the restaurant, classic in the rooms. If the performance of the zones is insufficient, it is possible to connect a booster amplifier to each zone. With this radio exchange you actually mix different signals, their power amplification and routing. The amplifier is designed for mounting in a 19" RACK.