adds that extra oomph to your sound if using smaller midrange speakers, I am using this sub with 8" PA speakers ..the sub is a lighter weight than previous subs so easier to move around and smaller to store but still gives plenty of bass..I haven't turned it up fully as the venues were quite small, but will do so when outdoors...I purchased a cover at the same time to protect and delay the obvious scuffs speakers take.....It sounds great