I would go for a mid sized floor stander or a bigger sized monitor on a stand. I've messed around with all kinds of speakers in my bedroom that is about the same size and a mid sized floor stander will give a lot of bass at least in my room it does. You have some darn good electronics so I'm sure you have a pretty decent budget. You prob could make a set of Wilson Sophias work or how about revel studio? Or a Dynaudio? I'm not sure if what is known to match well with Pass Labs but I'd start there and don't be afraid to get something mid sized. Your room is not that small.