diameter voice coil diameter 18 457 mm 4.0 102 mm power amplifier low- ... peak 0.03 passive dimensions 23.5 597 mm line input power us europe 120 v 60 hz ... 230 v 50 hz 23.5 597 mm 11.2 284 mm 3.5 89 mm rated power into ... loudspeaker s rated impedance 28.5 724 mm 7.1 180 mm physical properties height ... 28.5 724 mm width 23.5 597 mm depth 23.5 597 mm weight 132 lbs 60 kg ... enclosure 15 mm thick multi-layered baltic birch wood 3 ... .3 83mm 5.2 132 mm 9.4 239 mm 3.5 89 mm front 3.3 83mm side 23.5 ... 597 mm top swa1801z on axis frequency response ... 70 60 50 spl 100 db 100 hz 27.9 709 mm 7.0 178 mm fundamental second third 10 ...