I own all manner of AVA equipment having discovered Frank in 2009. Many here go way further back. In any case, I have a whole buffet of Frank's equipment to mix and match (T10, Ultra series, Insight series, Fet Valve, SET series, Mk V DAC, et).
I'm presently using my Digital Preamp/Dac with my Insight 440 in my living room setup, but I've used it with my NP1 in my man cave, and its been fabulous with both. I use Salk speakers exclusively in my home.