Supports two power amplifier inputs four speaker outputs.(4 sets of speakers can be turned on or off independently). Four sets of stereo speakers can sound at the same time or one or more sets of speakers can be turned off separately manually select a pushbutton switch. Offers banana plug connections and each channel supports power up to 300W. Provides 6.5mm earphone output with adjustable volume knob. Signal input provides noload protection of vacuum tube power amplifier signal.