Is there a such too much power for speakers?

As for your question of soundstage, the preamp, amp and speakers all contribute to the soundstage. Clean power and plenty of energy storage are crucial. 

Speaking of NASA, they put up a satellite many years ago with the goal of measuring very fine variations of the background radiation that permeates the universe. One interesting little tidbit that I recall is that the radiation had a frequency of several hundred or thousands of light years, now frozen for all eternity. Someone was playing some monstrously large bass back in the mists of time.

sorry for going off topic.

Go with as much clean power as you can afford. Your speakers are $20,000, so a good preamp and amp are in order. I had a pair of Sonus faber Cremonas, rated at 270 watts and 4 ohms, mated to a pair of Classe monoblocks rated at 600 watts into 4 ohms. I was never ever concerned with blowing the speakers - my eardrums are another story.

i recently listened to a pair of Sonus faber Nova iii’s connected to various amps, most with output over the Nova’s rated input. All sounded glorious. At ear shredding levels, I think the Mac was putting out 50-60 watts. 

Ive also listened to speakers connected to amps that are near the bottom of the recommended speaker power input, and the sound at higher volumes was not satisfying.

All of the amps that I auditioned wher in the $15000 range.

bring your favourite music, a decibel meter, and have a listen at concert levels. 

DTC,
totally agree with you, and I think gdnrbob describes the reason for lots of power well, for us  non-techies.

Cakyol,
Then, when you have that perfect ratio of 2:1, and only then, shall you listen to Army of Mushroom, by Infected Mushroom, at full volume. Only then. To do otherwise would surely result in your drivers melting into magma, your cabinets splintering into kindling, and your amp exploding in a mushroom cloud of oxidized metal.

Otherwise, it’s a really fun CD.

I think NASAMAN is a bot....

Hey NASAMAN, 

what speakers do you have?