@stuartk I have read many of the responses before mine and although some seem helpful, I think that most miss the central point, which as I read your original post is BASS BLOOM. The two most important affectors of bass bloom are poor amp control (e.g. low damping factor) and speaker characteristics. To improve those components you have to change something. Just sticking with equipment that means either the amp or the speakers.
One possible out that would let you keep your existing components is the addition of one or two mini Subs. Subs such as the new SVS 3000 micro ( $799 ) have gotten great reviews. I personally own an SVS 2000 Pro and the addition of this unit to my Maggies ( MG-III ) has been lovely. It is clean articulate and powerful and it lets the Maggies do what they do best. The SVS has a neat phone App for customization of low pass filter and attenuation from your listening seat and they have a thirty day return policy. Good luck.
One possible out that would let you keep your existing components is the addition of one or two mini Subs. Subs such as the new SVS 3000 micro ( $799 ) have gotten great reviews. I personally own an SVS 2000 Pro and the addition of this unit to my Maggies ( MG-III ) has been lovely. It is clean articulate and powerful and it lets the Maggies do what they do best. The SVS has a neat phone App for customization of low pass filter and attenuation from your listening seat and they have a thirty day return policy. Good luck.