Pa speaker active speaker series behringer eurolive principle active woofer size 15 inch design 2 way system speakers hf 1x 175 lf 1x 15 dimensions 470 x 732 x 424 mm weight 28 kg power rating rms 250 watts power handling peak 550 watt noise level 126 db frequency response 50 18000 hz types of connection 6 35mm trs xlr