Wharfedale Pro SIGMA-18B Passive 18" Subwoofer 500 W, 133 dB

The SIGMA-18B is a passive bass-reflex subwoofer with one 18" driver and a 2.5" voice coil, rated at 500 W continuous and 2000 W peak into 4 Ω. Maximum SPL is 133 dB at 1 m in half space, with a 35 Hz to 250 Hz (+/-3 dB) response. The MDF cabinet has four handles, a 35 mm pole mount and 2 x NL4…