I'm a firm believer that bass trapping can solve a lot of issues for little money and effort. Taming that low end helps a bunch as Eric pointed out.
My room response before and after bass traps and treatments:
https://www.audiogon.com/systems/10635#&gid=1&pid=10
That resulted in a +- 4.5 db range for my sweeps. I was told years ago that +-5 is a reasonable target for room response. If true, then I've told my pea brain to just hold tight and enjoy.
My substantial bass traps were built as large as I could fit in the front corner spaces. As many have pointed out, corner traps like @lemonhaze are using are also employed in the rear.
All of this is in my TN systems page photos. I failed at pasting in the graph photo here.
No matter what I do or how I measure I have not eliminated the 100 hz bump. I've considered a cheap equalizer to knock it down but really don't want another device in the chain. The room is like Mother Nature. It always prevails.