The equipment required to implement background music at your venue depends on the area you consider for sound coverage. A small diner may only need one music source, one amplifier, and a few speakers. On the other hand, a department store may require several different sources, power amplifiers, and an array of speakers in multiple zones. The Music source is the programmed audio signal to be distributed over a designated broadcast zone. Ceiling speakers are standard for BMS installations, and subwoofers and custom satellite speakers are used in Hi-Fi locations, i.e., Bar Lounges, Show Rooms, Restaurants, Waiting Rooms, etc. Typical commercial audio systems use 70-volt driver signals.