How much power can a pair of Klipsch La Scalas take ?

My room is 25-20, my La Scalas are 1970. I up graded caps and tweeters. They sound great I run a svs ultra sb16 with them. I like loud music but also like clean sound down at lower sound levels.

It’s great that a pair of (partly upgraded) almost 50 year old speakers can still bring joy to a listener - without any notable sonic degradation, that is. Certainly a testament to their longevity. My setup is quite similar to yours on the speaker front (my speakers are "modelled" around the Klipsch Belle), and I also use an SVS SB-16 Ultra to augment my main speakers downwards. With your large-ish listening room and desire for loud playback I might not suggest an 8 watt SET..

You will love this. My friend asked me if I wanted a pair of big speakers. St the time I didn’t have a stereo system. But I said bring them over he showed up with a pair of Klipsch Chorus speakers. I was so impressed with them I built a new sound system to take full advantage of the chorus speakers. I ran into a problem when I tried to match another pair of speakers with them. They drounded  out every speaker 
i ran until I found the La Scalas they have the same sensitivity so they don’t drown out the others 😁

A-I've seen clubs use LaScalas.  They can put out a ton of sound without too much power.
B-It's not the wattage that will blow a speaker, it's the distortion.  Your ears will bleed before those will blow.
C-I ran my Cornwalls with 100 watt Threshold and never pushed the power output.  10 watts was fairly loud.

I ran mine with 35wpc tube amp. They were more than loud at 12 o clock. I also ran a 135wpc vintage marantz and they handled it no problem. If ran too loud your ears will bleed. 

I’m trying a acurus ss amp. I’m having trouble with the midrange if the song has a lot of mids in it they get fuzzy . Any ideas on what it could be or how to fix?
i have already upgraded the tweeter and crossover boards with bob Crites .