... )6.3JACK INPUTAUX(-20DB) RCA JACKMIC INPUT:UNBALANCEDCONTROL: 3 VOLUME CONTROL ,MASTER VOLUME WITH LCD Dimensions:Subwoofer dimensions: 295(L)*280(D)*170 ... the manufacturing of public address amplifiers, public address mixers, car stereo speakers, subwoofers, horn speakers, tweeters, sirens, speaker boxes and other ...