DESC: The integrated Power Port Bass Vent designed right onto the back of the compact Satellite & Center Channel speakers-the same technology used in full-sized Polk Audio speakers-improves lower midrange response and all-important sub/sat blending, taking the RM6750 beyond the performance realm of any other sub/sat system in this price range. This integrated design reveals midrange with no hole in the frequencies between the sats and the sub, for male vocals that are rich and full-not thin and weak like other sub/sat systems. The RM6750 comes with its own subwoofer module, an 8 inch long throw driver and high current power amplifier for real ground-shaking bass thrills.