Is there a such too much power for speakers?

The issue with very high power amps and damaging speakers is not from sustained listening but from a sudden burst, which can happen by accident with a bad setting. For example, you can have mute on somewhere back in the chain and try to turn the power up to listen. Then you realize that mute is on so you take it off and bam - 500 watts into your speakers. It also can happen when you have a wrong input and turn up to the volume. When you change back to the correct input the same thing can happen. These type of accidents do happen and, with high powered amps, it can be a problem. It only has to happen once.

Of course constant clipping is also a problem, but with a $75K amp, it is probably not going to clip very often.

I think NASAMAN is a bot....

@fundsgon My speakers aren’t too hard to drive, SF Elipsa SE. currently mating with VTL tube amp ST-150, 120wpc. Since I’m now in a bigger room 15’x20’, I need more powerful amp.Bea Lam from VTL suggested between MB-450 (425wpc, $25k) and S-400 (300wpc, $25k)My Local stealership suggested me the more powerful, more expensive, the better which is their flag ship mono block Siegfried (650wpc, $75k).. I knew something wasn’t right. First I don’t have $75k. Second, I ain’t paying $75k 
 Side note: I’ve been eyeing on The next model up from mine, the S-200 (200wpc, $12k) very nice unit but they tend to skip it for the higher ones. 
Any VTL owners want to chime in?
Greatly appreciate 

  More power isn’t better. Better quality design and build is better. My Kyocera MOSFET from the 1980’s is rated at 50 watts/channel, with 125 watts/channel on demand. It will push my speakers well beyond the pain threshold with no distortion. Sorry, but I think most of the stuff they make today is overrated junk. Invest in some good vintage gear.

Not sure about the SE, but the Elipsas have a somewhat demanding low end. They drop to 2.5 ohms around 100 Hz and have a large phase angle around 70 Hz according to the Stereophile review. So, even though they are rated at 91 dB, they may need an amp with significant current to deal with the low end. The SE has a new crossover, so it may have quite different measurements.

I doubt you would hear much difference between 400 watts ad 650 watts, although design differences can also cause different sounds.

I would ask you dealer for some loaners. At those prices, I would definitely want to listen to the options.