Pa speaker pa sound system principle active woofer size 10 inch construction bi amping speaker lf 1x 10 dimensions 265 x 330 x 537 mm weight 13 kg power handling peak 600 watt noise level 123 db impedance 8 ohm frequency response 40 20000 hz connections sd card microphone usb types of connection rcacinch stereo usb case material bass reflex