Which amplifier

Here’s a reviewer, one of the very few in whose ears I trust, that actually reviewed the amplifier, the class A Luxman L-550AxII, with a pair of modern Cornwalls.

https://youtu.be/t_bVWoMlfR4?si=ua_Dm0uLsbcwcSk8

FWIW

Happy Easter!

Can't go wrong with either, if you want warm, get Mac, if you want detail, and soundstage get Accuphase. Both will be amazing with your Klipsch speakers. 

I would pair a less warm amp with the Cornwalls, which are a bit warm on their own.  I’d go with the Accuphase.

I completely agree with @faustuss I have both of these amplifiers and I can confirm that they have too much power for Klipsch speakers, if you do not want to change speakers then I highly recommend Luxman SQ-N150 which is perfect for your speakers and has very good MM and MC phono input.

I own Mac amp and pre, but damn that Accuphase kit is pretty!