Best integrated amp for Harbeth SHL5s

There is no such thing as "best" integrated.
That is purely a heavily biased value judgement
System synergy matters big-time so the final choice can only be driven by your system and your ears.

In that regard, may I suggest the REGA OSIRIS ?

It impressed me enough to buy it. When I was auditioning them,
The LFD was my second choice.

Well worth the audition .....

just my two cents, having to experience with your speakers. That being said, the McIntosh MA600 which I do own sounds great with all the speakers I have used. The McIntosh line of integrated amps is more than worth a look. Luxman and Marantz are other brands I feel would be worthy of your consideration. Happy hunting. Please post your final choice.

I have all the Harbeths except the 40.1 and the SHL5 is a very great speaker, perhaps my favorite. I have tried it with Naim, Luxman, VAC, Classe, Pass but the ands down winner for me is Exposure. The 2010S2 model. So perfect. Please give it a try!

The new Roksan K2 BT. More power. Completely upgraded Preamp
section. Read three reviews of people who actually have listened and purchased the unit. One owner was concerned that is was overly smooth with too much color but after 200 hours it blossomed into full bloom with a very rich velvet midrange and outstanding 3D imaging and soundstage with excellent top and bottom end. Also makes and outstanding stand alone preamp with its pre-outs and would be an excellent choice to pair up with an excellent high powered Class D amp since the K2 has a warm sound which would balance well with the neutrality of Class D.