Warm romantic & detailed

For pop and rock music with Harbeth, minimum in my book is SHL5+. They are still capable of sounding dynamic with punch and slam in the bass, only with the right amps. Other good alternatives include Spendor D7 or 7.2 and Tannoy Eaton.

Never liked Focal speakers. Sound too bright and tinny at the top, lean and thin midrange. Harbeth sounds full and warm in the mids but with sufficient detail and sparkle at the top, unlike some speakers from Sonus Faber which sounded pretty much dead with muffled sound and rolled off treble.

Jeff ,

You are fortunate if you live near Fidelis Audio.It is a great Audio store with a really good staff of people. Would recommend spending more time there to listen to their Harbeth Line up. 

I have Harbeth M40.2 speakers and listen to mostly Rock, Hard Rock and POP music.  

I'll throw my vote to whichever Tannoy model best suits your room/budget.  I've got Focals, B&Ws, Dynaudios, Klipsches, Totems, and Tannoy Stirlings, at the moment.  For me, in my room, with my equipment, the Stirlings take the prize.  I really, really like my B&Ws and Dyns, but those Tannoy drivers have got some magic to them.

jeff
You should really consider listening to a 300B amplifiers with speakers that are compatible with these amplifiers. So much richness without raising the volume. Rich full bodied midrange is so important 

Cut small squares of an old t shirt, try 1 layer first, then 2 layers.
tape directly over tweeter, replace grill.Cheap tweak, and it works well.

if still harsh, use 3 layer of tshirt squares.