Pioneerts wx120a subwoofer with built in mosfet the ts wx120a is an extremely compact yet powerful subwoofer system for your car its built in mosfet amplifier boosts no less than 150 watts through the aluminium cone woofer suitable for any kind of music this sub produces a deep robust and high power bass all the way down to 30 hz it has a wired remote so you can easily tune gain phase and lpf amplified subwoofer pioneer active subwoofers are small and compact in size yet big in