Are Harbeth the only warm and euphonic speakers in town ?

ADS L Series.  Beautiful mids.

Why is it that so many people are gunning for Harbeths?

I'll admit they won't suit everybody, but they are the only speakers I have ever owned that don't have me itching for an upgrade.

I’m surprised no one has mentioned Magnepans. I have the Harbeth SHL5+ speakers and love them. I wouldn’t describe them as warm, however. They sound very detailed and natural in the mids, and without coloration. After owning Klipschorns, Tektons, and others, these are my endgame speaker. Based on what you said you’re looking for, I think the Harbeth 30s would suit you perfectly.

I also have Magnepan 1.7i’s and LRS speakers. The Maggies have very nice, rich mids. For me, the Harbeths are superior to the Maggies in most areas, but the Maggies sound very nice, and I enjoy switching them into the system every now and then. I would suggest that you’re on the right track by making tonal quality a priority. There are plenty of speakers with a detailed, analytical sound, but I greatly prefer the organic, natural sound of the Harbeths and the Maggies.

I’m surprised no one has mentioned Magnepans.

i think that is because the op asked for a bookshelf speaker...

Ok guys grab this one!

I’ve been down the expensive speakers road many many times and don’t regret it at all- when I relocated to the tropics I never thought I would have to give up

tube equipment but I did! Also I gave up the large speakers bec my 12’x14’ cave

was what I wound up with-I should have thought this one out but I did not. 
 

in Sum I purchased a pair of Andrew Jones Elac 2.0/b 6.2 and a SS integrated amp

And I lucked out big time! The resonance of the room and the speaker output is a great marriage . Also got a pair of EPOS Epic 2- unreal!

And all at the a fraction of the expense of past gear!

The integrated amp is Rotel A-14- best kept secret - versatile great sound stage programmable auto shut off  and it works!

this is a long way financially from my Boulder equipment to mentions few !

LARRY