The ButtKicker Mini LFE is a patented 4 ohm low frequency transducer that features a 6 Oz. (0.17 kg) magnetically suspended piston. The ButtKicker Mini LFE is accurate, provides powerful frequency response, is virtually indestructible, and requires no maintenance. The ButtKicker Mini LFE haptic transducer requires a minimum of 50 watts and we recommend a maximum of 250 watts. Please note that the ButtKicker Mini LFE does not include a power amplifier.