Active speaker pa sound system principle active power 1 200 watt woofer size 10 inch design 2 way system construction bi amping speakers lf 2x 10 hf 2x dimensions 305 x 370 x 637 mm weight 215 kg power handling peak 1 200 watt noise level 127 db impedance 4 ohm frequency response 35 20000 hz connections sd card microphone usb types of connection rcacinch stereo clamp contacts usb case material bass reflex