Polk Audio TSi 400 FloorStanding Speaker (Pair) Plus A Polk Audio CS10 Center Channel Speaker bass-reflex (ported) design / frequency response 44-24,000 Hz (-3dB) handles 20-200 watts / 8-ohm impedance / sensitivity 91 dB 1" Dynamic Balance silk dome tweeter / three 5-1/4" polycarbonate woofers woodgrain finish with piano black top plate