Description Our 6-inch amplified Bass Tubes have an integrated 100-watt amplifier with a Bass Tubes enclosures and variable gain control. They’re easy to install and the perfect way to upgrade any audio system with variable 50-250Hz crossover (BTA/MBTAxx250D versions only). It has a 6-inch dual voice coil subwoofer and, thanks to its compact size, fits great behind the seats of small trucks and in the trunks of sedans and hatchbacks. Straps included for secure mounting. (BTA6100) (BTA6250D) Bass Tubes enclosures promote maximum efficiency Optimized for corner loading for maximum bass output Integrated 100-watt amplifier 6” dual voice coil subwoofer< Variable 50-250Hz...