Pa speaker principle passive woofer size 15 inch design 3 way system speaker lf 1x 15 dimensions 475 x 655 x 355 mm weight 166 kg power rating rms 400 watts power handling peak 800 watt impedance 8 ohm frequency response 30 18000 hz sensitivity 97 dbmw types of connection 6 35mm trs screw terminal speakon screw terminal gold plated case material bass reflex housing material wooden