I added 3 more filters tonight and surprisingly the overall effect is very subtle. Its hardly noticeable at all for music even stuff with reasonably low pipe organ notes.
I tried the filters out on LOTR Cave troll and Balrog scenes, and the difference was more noticable, but subtle. There was a reduction in boom for some of the low lfe stuff and maybe a little tightening in the sound like where parts of the bridge start to collapse.
I am quite surprised a 14db cut at 52Hz seems like such a subtle difference.