After all this time, here are the test results of a Peavey IPR-1600 provided by Peavey themselves and JD (sickneedshelp). I think they are to be applauded for letting a garage amateur have one of their new amplifiers when there are so few reviews out yet.
BUT, I must qualify the results that you see. I am not sure how to put this but the best analogy I can come up with is this. For any of you old enough to remember Ford's and Chevy's from the 60's & 70's, they were fairly easy to keep running. No computers, no automatic functions, no traction control, etc. You could set the points with a matchbook and they would run. Now imagine working on a car made past the year 2000 with that technology. You would be lucky if it would get started again.
That is what it has been like for me trying to apply solid state sine wave/THD testing to a modern Class D amplifier. I got the measurements, but they do not match what the factory can squeak out of it with computer based test equipment, active filters, etc.
When these amps are put on the bench at the manufacturer, they are hooked up to Audio Precision units with AP filters that will essentialy take the testing out of the operators hands. The test gear will get set with a 20 ms on/ 10 ms off burst tone that will automatically go from 20-20KHz and spit out a nice file with all the data you want to publish. I can't do that at home.
So what follows is what I measured on my test equipment.