Harbeth P3ESR metal tweeter

I think any 50 watt amp is sufficient. They have a low sensitivity rating but they are easy to drive. What size room do you have?

They are easy to drive.They will play as loudly as you'd like with 50-60 watts.They won't have excess sibilance unless your speaker cables are a bad match.

My P3ESRs are really easy to listen to. I've never found them bright or harsh, but they do offer a lot of detail. I have mine in kind of a near field setup in my computer room. I'm many ways, they are my favorite speakers. They're also the least expensive speakers I own. They shouldn't need any "taming".

Thanks for the interest and replies.

The room is approximately 15' x 12'

Tellurium Q black cables (bananas)  swapped out occasionally with LAT International (spades). No clue on what criteria to look for to create synergy. 

Also I plan on using an existing B&W PV1D sub if needed.