I use the Ayre CX-7eMP with the K-5xeMP preamp. Yes you can use single ended interconnects with the Ayre K-5xeMP as it provides 2 inputs. Please see the attachment from Ayres web page regarding converting all incoming signals to balanced.
https://www.ayre.com/features.htm#tech1
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https://www.ayre.com/features.htm#tech1
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