Upgrade from ProAc Response D2 in small room


I’ve been enjoying my ProAc Response D2s, supplemented by a pair of tiny REL subs but…of course wondering if I can improve. The room is a bit small: 10' 4" x 14' 6" x 8 and treated with several GIK bass traps. Speakers are being driven by a Belles Signature Dual Mono.

Any thoughts on possible upgrades? 

goethe58

What specific improvements are you looking for, what’s your budget, and are you looking for new or used?

I'm curious,what exactly about the sound are you trying to improve?
 Is your room properly treated?
 If the rooms Acoustics are sorted out,with those speakers,I think I would be looking at an amplifier upgrade before moving on from the ProAc's...
 

@goethe58 "treated with several GIK bass traps" how was this done and did you take any RTA alongside your listening to them in your space.

Cos I don't know what is missing that you want to change unless you just have what is called upgradeitis