Best battery powered subwoofers - Portability is now an option.
Minirig Sub 3 - Portable Subwoofer - Made in the UK
MONACOR: Products
New Lanzar MAXP84 Max Pro 8'' 800 Watt Small Enclosure 4 Ohm Subwoofer 744271348743 | eBay
Amazon.com: Polk Audio PSW111 8" Powered Subwoofer - Power Port Technology | Up to 300 Watt Amp | Big Bass in Compact Size | Easy Setup with Home Theater Systems Black : Electronics