Pa subwoofer principle passive woofer size 15 inch design 2 way system speaker lf 1x 15 dimensions 640 x 510 x 445 mm power rating rms 250 watts power handling programme 500 watt power handling peak 1 000 watt noise level 125 db impedance 8 ohm frequency response 25 250 hz sensitivity 95 dbmw types of connection 6 35mm trs screw terminal speakon case material bass reflex