Hi there, i am selling my 2 Buttkicker Mini LFE transducers. They are a year old and in perfect working condition. I am only selling them as I am moving. These will act like a subwoofer, but without any noise. 2 of these will properly shake a full sided couch :-) From Buttkicker: A single-seat transducer with excellent musical response, from deep bass to lower mid-range, the ButtKicker mini LFE adds amazing impact and tone perception. The ButtKicker mini LFE features multi-directional mounting bracket for versatile mounting options. Full details can be found here: https://thebuttkicker.com/buttkicker-mini-lfe/ please contact me with any questions you may have. Cheers, Ken