One pair of Centrios 401-8176 speakers for sale. They were intended for the front R/L speakers in a 5.1 system; but would also work well in a typical 2.1 system as well. The unusual side firing woofers keeps the front baffle width down around the smaller drivers to minimize surface reflections & diffraction issues (that would have an adverse effect on imaging). Nice sounding bass-reflex cabinets with an 1" ferrofluid dome tweeter, two 4" PolyMica drivers & a 6" PolyMica woofer. Used, but in good condition. * Tweeter: 1" Ferrofluid Dome * Drivers: Twin 4" PolyMica * Woofer: 6" PolyMica * Sensitivity: 90dB * Nominal Impedance: 8 ohms * Maximum Amplifier Power: 150 watts * Frequency Response: 70Hz ~ 20kHz * Dimensions: 8" x 6" x 24" tall * Video Shielded * Weight: 11 lbs. each