100W max, 80W music ; Freq resp: 45Hz-26kHz; Users can play speakers individually or in any combination of pairs ; Dual amp inputs allow 1 audio source in 1 room & a different audio source in another location; Compact size to fit into any system; Easy to use ; Protection circuitry automatically protects the amp from low speaker impedance using auto-impedance transformers ; Attenuation steps: 11 step, 3dB/step ; Dim: 17″H x 7.5″W x 3.25″D; For 4 speaker pairs; Each;