You might want to try the Aesthetix Calypso which is a great sounding preamp. The only question is whether your amp has balanced inputs. All of the Ayre gear is designed to perform best using balanced connections. Same with the Aesthetix gear. Good Luck!
Go with the K-5xeMP and use balanced connections. I used a K-5xeMP with my C-5xeMP before upgrading to a KX-5 Twenty and VX-5 Twenty combination, but the K-5xeMP gave me most of what I was seeking, i.e., the depth of soundstage and a bit of warmth I experienced with a pair of Cary tube monoblocks. Warning: The Ayre stuff can be addictive.
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