Here is my experience with SS and tube power on a pair of Nola Ko speakers. 1st I had a MF m6 series 230 wpc SS amp running them. A little forward that would fatigue my ears after a couple of hours. Next I used a 75 wpc KT 88 tube amp. I thought now I'm moving in the right direction. Much more refined sound quality. And I can listen for much long with no listening discomfort. Next amp was a 20 wpc tube amp with el84 tubes. Now much more open and airy sound and still quality bass. Now here is the big surprise. I tried a 8 wpc single ended amp on them. To my surprise this was the overall best sound quality amp for my Nola Ko speakers. This Wee amp can push them to 80 db in a 24' x 18' room very easy for many hours on end. And the plus side of it is no listening session is to long now. 

Considering that you use a well designed amp that can provide 6dB dynamic headroom : for Hifi listening you will **NEVER** need more than 2x50W RMS/continuous 0.5%THD-20Hz-20KHz ( 6dB dynamic headroom ~ 2x200W dynamic power) to drive the most demanding speakers (most demanding speakers are usually the small "low sensibility" bookshelves)

If you need more than 2x50W RMS : then you are either doing "sound system" - not Hifi (it’s not bad to seek "sound for the whole room", but it’s not Hifi listening); ... or it means that your amp is not designed for Hifi (Usually high end Hifi amps have a good dynamic power, but I’ve seen amps costing more than 10K$ with specifications that I wouldn’t validate for Hifi listening : these are sound system amps).

For sound system : the amp should provide at least 2x200W RMS at less than 0.5%THD, but it varies with the room size , so you may wan 2x500W RMS for a very large room. Room size is only a matter for "sound system", for Hifi room size is not relevant as you will always listen at 3~4 meters at the sweet spot in Hifi !!!! (else it's not hifi).

Everything is explained here :

Excellent discussion. Here’s a musical take. 
 

Why Do Tweeters Blow When Amplifiers Distort? See below:

Mike

https://sound-au.com/tweeters.htm#a6

Why Do Tweeters Blow When Amplifiers Distort? See below:
Mike

https://sound-au.com/tweeters.htm#a6

That site is normally a good source of information, but that particular section "6 Bigger Amplifiers" seems short sighted to me:

• It assumes that a hapless user, when given more power capacity, will simply crank the volume in an attempt to recreate the Maxell ad. OK, I like it loud but I’m not that stupid lol.
• It ignores the fact that music source material has decreasing energy content (amplitude) as frequency rises. This means that most of the musical energy energy is handled by woofers, not the tweeter. Speaker designers respond by designing speakers with much higher power handling in the woofer section. Quite reasonably, it’s difficult to create a tweeter with very high power handling that doesn’t adversely affect its cost and HF performance. Result: speakers can handle their rated power levels IF the spectrum content of the program material is "correct". Led Zep: OK. Lady Gaga: OK. Pink or Brown noise: OK. White noise: NOT OK. Amp clipping: NOT OK.
• An amp that’s clipping on a high amplitude low frequency wave form will create a squared waveform that suddenly now carries a LOT of high frequency energy. This HF content was NOT in the source material, but it’s now going right into the tweeter - which was not designed to handle such high peak levels of energy! Its amplitude is proportional to the LF waveform (very high amplitude - the max allowable by the amp's rail voltage) that’s being clipped, which is way higher than you’d see HF content in nature. That’s why it sounds SO BAD and kills tweeters.