I'd like to try my Ayre KX-5xeMP preamp with an Ayre V-3 amp to drive a pair of KEF LS50s augmented by a pair of KEF KC62 subs. Source would be Roon provided via ultraRendu with LPS 1.2 and Ayre QB-9 DSD DAC. If anyone knows of an Ayre V-3 for sale I'm a buyer.
I will echo the recommendation to upgrade your QB-9 to Twenty status. I had mine done over a year ago and it's a significant upgrade. I feed mine with a Lumin source and also have JC1 amps in the chain. It all works extremely well together.