@surlydale , I also don’t listen very loud. Loud for me is about 85db peaks.(Using an iPhone app). I occasionally run a pair of Graham Chartwell LS3/5 using my J2. These are not very sensitive speakers at 83db,however are a pretty easy 9ohm. The J2 has no issues driving these to the higher end of the volume I listen. The easier the load the better. I am currently running a pair of Nola Boxer II’s, 90db sensitivity, and an 8ohm load without the J2 breaking a sweat.
The one piece of advice I’ll give is, let this amp breath it definitely runs hot. I don’t recommend putting it in a rack. Other than the heat,I don’t find any negatives for the J2. Like others have stated,synergy with speakers and your listening habits mean everything. Enjoy!
Ray