Pioneer S-21W Active Subwoofer with Downfire Bass Reflex Cabinet (100 Watt RMS, for home cinema speaker configurations 2.1 to 5.1, subwoofer cable 3m included) Black : Amazon.co.uk: Electronics & Photo
Pioneer SW-8MK2 Andrew Jones Designed 100 W Powered Subwoofer ACTIVE 120 V 60Hz | eBay