I do live sound mixing/producing for filthy lucre, and although I have pro amps around I would never use them for my hifi...the high power of pro stuff gives you the headroom needed for uncompressed sound and live systems rarely use all of it...powered speakers are generally cruising along as they're generally very efficient, as are pretty much every type of live speaker I've used. I had a pair of Altec A7s for my bands in the 70s, driven mostly by a Kustom "Bi Amp" that had 200 watts for the woofers and a hundred for the horns...loud. Note that in a Magico factory tour I noticed a QSC GX3 amp like the one I have on their shelf (an inexpensive masterpiece of a powerhouse amp, what does Magico use it for? Hmmm)...I occasionally use mine for monitors or whatever on some live shows, and in its little road case it's generally used as a footstool for my wife's home office chair. The fan noise makes it unusable in my studio so I use an old Alesis RA-100 in there. My hifi amp is a massive 12wpc single ended tube amp, and I won't be using that for live stuff.