Pa speaker series electro voice zlx principle passive woofer size 15 inch design 2 way system speakers lf 1x 15 hf 1x 15 dimensions 685 x 423 x 383 mm weight 166 kg power rating rms 250 watts power handling peak 1 000 watt noise level 126 db impedance 8 ohm frequency response 56 18000 hz sensitivity 96 dbmw crossover frequency 1700 hz