Watts and power

I doubt that audio savvy people drive tube amps to clipping when actively listening unless that listening involves heavy drinking and dancing with lampshade headwear. I used to be able to easily demonstrate where my 12Wpc tube amp clipped because my main speakers were around 90db efficiency, but now that I'm using 99db horn loaded Heresy IIIs they simply get way too loud for that sort of thing. Still, I rely on tube distortion with guitar amps, but even in a "clean" mode they are so much better sounding overall that there's no contest with the silly "modeling" amps or any SS guitar amps. Some jazz dudes still use SS amps, but many don't (John Pizzarelli borrowed a little tube amp from me at a concert last year...a 15 watt Reverend Goblin, and the brilliant Matt Munisteri used a mint 64 Fender Princeton Reverb with Katherine Russell). Tubes "seem" faster and snappier in hifi and elsewhere. Or so they say, and I agree.

After all of the back and forth regarding the watts issue, I was wondering if there's a simple device like my Radio Shack multimeter that could be stuck on the speaker output (or speaker input) jacks to see exactly how many watts I'm using to drive my allegedly 99db sensitive speakers at the levels I generally use. I know Nelson Pass uses something (and he likely has many bits of testing gear) like this at times while listening as it was referred to in some interview...the interviewer noted how few watts were used relative to the levels...I wanna do that...can I?

My wife uses a heavy QSC 350wpc a/b power amp in a "road case" in her "home" office whenever she's working from home...it works perfectly and silently since it's being used as a foot stool. Highly recommended.