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.
What is the best loudspeaker for a small room?
I have a very small audio room, 16 ft (L) X 14ft (W) X 8 ft (H). What are my options if I want a floor standing loudspeakers? Of course price is an issue but maybe I can equate the price later on based on the performance of the speaker. I enjoy listening to almost all types of music using pass labs pre xp20 and power xa100.5 amps.