Re: JBL SRX / QSC PL236 underpowered?
Andrew, the amps can not be under powered, they are what they are. If you are not reaching the desired SPL with the speakers you have, the speakers can be under powered.
For that set of speakers, I do not think you need to add another 75 degree box to it, unless you are covering a wide area, like outside, or a ballroom.
The PA system should be designed for the application, not the other way around - this will answer how many speakers and amps you need.
To simplify things, as said before, power the 715s with one PL236 in stereo, and the subs with one bridged. If you can pick up another set of subs, it may be beneficial to run 2 off of each chan of the PL236, but those subs will still be underpowered (SPL-wize) with respect to the tops.
Mike
