The ButtKicker Advance is a powerful and accurate low frequency audio transducer, built with patented technology. It translates low frequencies into vibration so musicians can really feel the bass. The ButtKicker Advance features a universal mounting plate enabling the unit to be attached to both vertical and horizontal surfaces and used on all types of furniture and seating. It can also be used with the chair / couch mounting bracket so that it can be easily slid under the one leg of your drum throne.