I upgraded from the Turbosound IQ15's (and 12's) and oh lord what a difference. You can play these so extremely loud without distortion that you just feel good when listening to them.
Still like my IQ's tho but if you want a super strong main front system, look no further. I have compared them to the Yamaha DXR15, Turbosound IQ's and a few Mackie systems and they dont even come close.
The DXR15's sound almost a clear/good on low/medium volumes but if you push them the JBL's SRX-series just leave them behind.