Wharfedale Pro SIGMA-X18B Passive 18" Subwoofer 500 W, 133 dB

The SIGMA-X18B is a passive 18" bass-reflex subwoofer with a 2.5" voice coil at 4 Ω. It is rated 500 W continuous, 1000 W programme and 2000 W peak, with 100 dB sensitivity and a 133 dB maximum SPL in half space. The MDF cabinet is offered in black or white Tough-Tone paint. Key features 35 Hz -…