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[gregdennis]

Looking to run two JBL SR4715's, dual 15 cabs,1200 watts at 4 ohm with a QSC PLX 3402. The QSC puts out 1100 watts at 4 ohms per side so just wandering if you guys think thats enough power.

[John Penkala]

Greg,
    Here's my take on the whole amp/speaker relationship. What is your application? Does the speaker produce the output you need without clipping the amp? If so, you have enough power. If not, you either need more power (if the speaker will in fact take that power and produce more output), more subs or more of both.  There is some information in the LAB studyhall that you should read regarding powering speakers.
    With that said, I provide a local cover band with a small system and the PLX3402 would be the smallest amp that I would use with those speakers. I'd prefer a Crest Pro9200 or perhaps an additional PLX3402 for my application. I hope this helps.

JP

[gregdennis]

Thanks John, You sure simplified a few things for me. Greg

[Don Boomer]

That's less that .4 dB from the manufacturer's recommendation.  I don't think you need to run right out and buy a new amp.

[Silas Pradetto]

It wasn't clear you were talking about a subwoofer. I'd say you're OK, those should get pretty loud.

[gregdennis]

no the SR4715 is a dual 15 cab with no horn.Used for subs only

[Bob Higgins]

Now is about the right time to re-post these links to amp/speaker tidbits from Crown:
 http://www.crownaudio.com/amp_htm/amp_info/how_much_power.ht m

...and from JBL:
http://www.jblpro.com/pages/general_faq.htm

...and from Comrade Boomer:
 http://www.peavey.com/support/technotes/poweramps/HOW_MUCH_P OWER.pdf