most clear, crisp sound power amps, monoblocks ?

Once you try an OTL amp there's no going back, tubes actually connected directly to the speakers. The cleanest sound I've ever heard! One thing to be aware of with an OTL amp you MUST be aware of the impedance of the speakers and match them accordingly. This is more important than other amp/speaker matching IMO.... not to say this doesn't make a difference with other amps and matching to the correct impedance, it's just more critical with an OTL design.

(Dealer disclaimer)

I think it is a very clear and direct question, "What is best". I recall a famous quote in answering that question, " TO CRUSH YOUR ENEMIES, SEE THEM DRIVEN BEFORE YOU AND TO HEAR THE LAMENTATION OF THIER WOMEN". I think that was either Conan the Barbarian or Michael Fremer. I forget which.

The Klipsh speaker brand makes some crisp sounding models. They have horns for tweeters which can be more forward sounding that way. Speakers have the largest influence on the sound by far, but generally speaking tube amps would be warmer and perhaps not to your liking. Another speaker brand would be Paradigm.

Narcisco that's the thing. It's hard to know what you consider live or crisp vs just plain irritating. It sounds lke you may be newer to the hobby, in which case you would be more than happy with Emotiva electronics. They make good entry level stuff that doesn't cost as much, good bang for buck there. You would be happy with their speakers as well, come to think of it. Maybe phone them directly, they can steer you right.

Live sound is only relevant as a reference if unamplified...otherwise get a PA system and sit 100 feet from it. My current hifi system sounds great to me, but that's likely due to ear damage and personal taste developed from spending over 4 decades as a musician and live sound mixer, which I still do and from which I shall never recover.

Narcissi,

There's a lot of learned people on this forum who are willing to help but your criteria is seems too vague to permit them to render much assistance. Since you must have something in mind and I assume will know it when you hear it, I'd suggest that you visit several audio stores and audition some systems.

Good luck with your search.