I guess since you listen to your music "Loud"....I need to tell you that I recently tried an McIntosh, model MC402. After swapping everything over from the Pass X-350 and powering it up?
,The difference in power was literally "astounding". Physically the X-350 is an intimidating amplifier. It is, just plain and simply, "Huge". But the MC402 is no slouch. In fact next to the X-350, it's the largest "By physical dimensions", amplifier I have owned and about the same weight.
The thing was, When I first powered on the MC402. I brought the gain up just a bit to hear the source that was playing. The gain was set so low that at most it should have been about 60db.
I didn't hear anything and walked over to the media player that I had been playing with as well, and noticed it actually hadn't started. So,
"And yes, I can feel many of you cringing , As you surely know what came next!!!"
I "manually" hit "start". The MC402 responded immediately, and out of the corner of my eye I saw the large glass pane in my, "French Doors" just to my left bow outwards from the SPL, As I turned quickly to reach the gain control to reduce the volume I noticed "Again out of the corner of my eye", that the "cat" was in mid-air, "NOT again" I thought. and very luckily down went the gain before any damage, "real" had been done. Over the next few days I played with the amp but it was just too much. I LOVE my music loud. Just under the threshold for damage actually. "I do keep a calibrated db meter handy". But with the speaker system I have, which is VERY sensitive. And the peaks at certain times, in certain passages were just too much because of the "headroom" that amplifier had. This in my 40+ years of listening seriously, has never happened before that amplifier or since. So you "May", wish to give a listen to one of those. The fellow I sold it to in Ca. a couple of weeks ago simply couldn't stop calling me and thanking me. "First time for that as well"! He had been "Bi-Amping" with a pair of MC2205's he said. And that he had wanted to try a more contemporary and possibly more powerfull amp. "Mission Accomplished"!
And I went back to my, "as I see it now", "Moderately Powered", X-350. Though according to "Nelson", It does have an "Albiet Breif", and I do forget the amount of "nano-seconds" mentioned but, An output of 1500WPC at certain times when reproducing "Detail" was in fact, available in the X-350. I will add though that as a whole I have always found the Mac's just a bit too bright for "my" ears at least. And at my "Reference" listening level.
But if you want a multitude of power..... Try hunting one of those up, or a similar "Mac".
And give it a shot. Many do swear by them. Just not "I".
I do wonder what kind of "Home" audio speaker would be "SO" inefficient that one would actually need a pair of their MC601's? Their use in "Pro" applications "Not-withstanding".