Never seen anything like this before? Fantastic for small duo's single artists etc! We started a classic rock duo, so the bands big PA kit was not ideal, being 12,000 watts and too large! As I do, I first check the Thomman web, I mean if they don't have it, nobody does! The Box CL115 Sub is fantastic, with the built in amp powering both the bin and top speakers, which are directly connected from the bass bin. Basically all you need is a desk, satellite speakers and the Box CL115 Mk11! Oh and a mic!! The power of the built in amp runs the tops at 4ohms, I use SX100 which are 8 ohms so the power drops a bit, but the amp peaks at 500 watts for the tops and bass bin speakers, which loud enough! Check it out, well worth a look! Best buy for us 'Jack Danielz Rock Band' this year!!