BMB CSV-450 (SE) 500W 10-Inch 3-Way Karaoke Speakers, Set of 2 Tweeter Sound Pressure Level* SW is used for preventing howling. High power next generation karaoke sound. Geared towards those who enjoy high tones and more bass. Woofers use highly reliable paper cone from Japan to get high quality sound. Anti-Howling measure for microphone. Best karaoke speaker in the world High power Next generation karaoke sound Geared towards those who enjoy high tones and more bass Have the new multicellular horn tweeters/squawkers to reproduce a wide sound Tweeter Sound Pressure Level* SW is used for preventing howling Woofers use highly reliable paper cone made in Japanese to get high quality sound Type: 3-Way, 3-Speaker Speaker: One 10&#034; Woofer each, 3&#034; Tweeter, 3&#034; Squawker each Max Input Power (Pair): 500W Impedance (Pair): 8 Dimensions (Each): 21.96&#034;(L) x 11.69&#034;(W) x 11.49&#034;(H) Weight (Each): 25.35 lbs