I own a pair of D30R's and I experienced the same "bass bloom" that you have. My room is about the same area. Speaker placement is most important. You have a good distance from the rear wall but are maybe too close to the side walls. I am fortunate enough to have a few amps (SS and tubes) to alternate before making a new purchase. I found placement and footing cured the problem without major expenditures. Good luck.
PROAC D48R Bass Booming
Dear all, I have just bought a pair of preowned Proac D48R speakers. I really love these speakers very much. But the only problem is Bass-boom and because of that, some tracks are unlistenable. My room is 17 L, 11 W and 10 W. My source is Ayre CX7EMP and I'm having a Balanced Audio Technology VK3000 SE HYBRID INTEGRATED Amplifier. Please let me know whether I can solve this problem. I there any benefit, if I change my amp and replace it with a Cary Audio SLI100 Tube Integrated amplifier. Thanks in advance.