Pa speaker principle passive woofer size 12 inch design 3 way system speakers hf 1x 1 mf 1x lf 2x 12 dimensions 910 x 375 x 360 mm weight 18 kg power rating rms 500 watts power handling peak 1 000 watt noise level 99 db impedance 8 ohm frequency response 30 18000 hz type of connection speakon case material bass reflex