It's an HK Audio active system and in this instance we were using 1 sub/2 tops per side which is more than enough for a venue up to 120 people. Slightly larger venue, we'd use 2 subs and 4 tops. It's the drummers kit and he and I have used it/hired it out at outdoor festivals with 4 subs/4 tops per side and they are bloody loud! And clear. They are brilliant. I've done a lot of live sound and they are easily the best system I've used.
The drummer uses V drums and we run everything through FOH, having a fairly quiet stage (and I'm not hiden away behind a big top unit). They can more than handle this, and have used them with rock bands, reggae and even a Bangra beat band. Didnt even break sweat.
They weren't cheap, all though in his over enthusiasm he bought too many units and we hardly ever have to use more than 2 subs /side.
Definitely recommend inline pa systems, but would advise a pre purchase testing session with reference music you know.