CLASS D

Have you considered bi-amping? I haven't heard your speakers bi-amped, but I've recently heard fantastic results bi-amping Q Accustics and Sonus Faber. 

Cornwall 4’s mated to AGD Audion Mk3 monos and fed through a Primaluna EVO 400 tube pre has worked very well for me especially after seeding the monos and the tube pre with Audio Magic M2 fuses. The DAC is a Holo May KTE. Will probably also fuse that with an M2 eventually.

I appreciate it. I already own a Crown class D amp. Don’t these little amps from China all sound about the same?

If it's a Box Woofer Klipsch. You NEED JUICE to move that Woofer. A flea bag Tube Amp is only good on the Horns. I ran Orchard Audio Ultra's on my Cornwall IV's with a Tube Preamp (BAT VK50-SE, Black Ice Audio F360, and my favourite Black Ice Audio Aries Headphone Amp/DAC/Preamp. 

Or an active sub with the high level hookups.