Is there a such too much power for speakers?

It is not how fast you go but how you go fast. You want to go as fast as you can as good as you can. Get the goodest, biggest amp you can afford. There is no such thing as too much power. The more head room the better. Distortion kills more speakers than power. There is nothing more dangerous than a dull tool.

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.