This high power, professional amplifier has two outputs, one for speech and music, plus one for speech only. Five inputs: 1 and 2 are balanced inputs, with priority paging and a (Bing-Bong) chime facility, inputs 3, 4 and 5 are each switchable between balanced microphone and line level inputs, for background music. A cooling fan is included to ensure excellent reliability. As well as mains operation there is a 24 Volt DC input for use in marine and commercial vehicle applications. Separate bass, treble and volume controls are located on the front panel. Only 100 Volt line speakers can be used with the P650U. 19 inch rack mount ears are supplied as standard. This unit features a Phantom Power option which enables remote powering of electric condenser type microphones, eliminating the need for batteries.