Now, this order was a mistake, I meant to order a smaller diameter Visaton for a project! Since this one arrived, I decided to try it out as a so-called 'butt kicker', a speaker that ports low frequencies to your lower body via mechanical conduction. I loosened my belt and placed the speaker (powered by a Thomann mono blok) in the waist of my pants and turned up the level...WOW! what a sensation! It's like being in a large club with great bass bins — not too far removed from the servo drive sub experience. I also tried it strapped to my head, and it yields those keyed video effects like the ones created in After Effects, except the organic version. My eyeballs were literally vibrating!!! AAA+++ to Thomann/Visaton for making this unit available — endless hours of fun!!