PrimaLuna Prologue Premium vs Luxman SQ-N10 ?

No hum at all on my end with the PrimaLuna, and I am powering high efficient Tekton Lore speakers. The Tekton does have great bass response so it might be that pairing with the PrimaLuna is giving too much bloat on the bottom end. I'm used to having very tight, articulate bass. Again, hoping the tubes break in nicely to do this. 

@dweller you mentioned that you bought yours as a demo unit, so perhaps your tubes and unit were already broken in, giving you the bass performance you're getting.

Playing through my Thiel 2.4se, I thought the bass was outstanding. Deep punchy and full. This from speakers not known for their bass output. The midrange was primo, as one would expect, but the treble was strained. BTW, have you checked for any hum from the PL? As I type I'm listening to the PL connected to my KEF Ref 201. I still hear some electronic artifacts -a "buzz" from the mid/tweet and 60hz hum from the woofer. These are VERY low-level and can't be heard unless ear inches away from drivers. If you have normal hearing and your unit is stone silent inches away, well, God bless you...  

When I almost have my ear up to my speakers I have literally no hum or noise coming from the PrimaLuna unless I literally cranking the volume to 3 or 4 o’clock (like 90% up), and my source is a Cary Audio tube DAC, which could also be adding the minimal noise that is there. Granted, both sources are plugged into a PS Audio Power Plant P3, so my noise is probably minimal. I’m also using psvane TII 12au7’s instead of the stock driver tubes. I also have some psvane grey bottle EL34s coming my way, but until they get here I am using the stock power tubes.

I do get more noise when playing vinyl but that is due to an MC phono stage with seven tubes, so that's understandable.

dweller,

I have a Ray Samuels tube head phone amp, and also a Herron Audio preamp that demonstrated hum issues until I changed the wall outlets , new industrial grade outlets ($5 per) solved the problems for me. Might be worth a try for you