I have been a Dj now for about five years and used quite a few systems and speakers, but allways come back to mackie srm450, very powerfull for 12" drivers, and never run hot or clip, absolute animals cannot fault them, i was going to try the Jbl 515s but the price put me off, for the same price of the Jbls i have got 2 srm450 v2 speakers, alen & heath mixer, speaker stands, and cables Bargin!!, The mackies are just as powerfull as the jbls but cannot explain it? the price difference is huge, its probable because there new, but if you wait a year the jbl will come down, or mabe its because the jbls have a 15" driver, but you cannot justify paying £1399 for the jbls, when the mackies are just as powerfull great quality for a bargin £950 with Free Speaker Stand, Bag and Lead lol.
JBL SORT IT OUT!!!!