What power amp or integrated amp are you using with your Harbeth speakers

@deadhead1000,
A pair of REL T/7i.
I'm set up running the subs from the left and right channel of the speaker outputs, using the Neutrik Speakon Interconnects. Since I have more than two pairs of speakers in the same room I'm set up running four Neutrik Speakon Interconnects off of speakers A and B and then I make the necessary Speakon connections depending on the speakers I select to listen to.

This is the guy who has his 40.2's in a small room.
https://www.whatsbestforum.com/threads/benchmark-ahb2-amplifier.25366/ 
He's using bridged Benchmarks.  380W should do the trick!

Replace the tube in your Croft with a Telefunken. Night and day.

parasound a21+ with harbeth shl5+.  finished.