Measuring DC probably won't tell you much, but IIRC a Fluke 189 has a fast peak read mode, in which case you might be able to look for peak levels approaching the voltage rails in the amplifier. Hold on...
Edit: OK, here we go...
http://www.fluke.com/fluke/uses/comunida...d_Functions.htmI kinda have a bad feeling about this. There was a line in Tom Clancy's "Without Remorse" where Clark is going through some rehabilitation exercise and the doc is advising that he's pushing too hard and his pulse is <some high number>.
Clark: What's the record ?
Doc: Zero
Can we get a second opinion on this ? There's a reasonable chance it would work but I'm not really sure it's a good idea even so. I just don't see anything good happening from wiring a fast peak DVM up to the amplifier outputs and suggesting you see how high it goes.
There's a "hey y'all, watch this" aspect that worries me...
