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Diaphragmatic absorption will fix this issue.

I’m sure some people are sick and tired of me saying the same thing over and over again… However, in all my experience I've never experienced a more amazing transformation than adding diaphragmatic absorption to a room. 4 rooms now I've experienced it and it is a life changer.

That said, all treatment there is a critical mass point where the effect is realized.

I’ve been in a living room with 24 cu ft of diaphragmatic absorption and it’s a nice step up in performance.

As it’s a shared living and use area it really comes down to budget and what is workable for your situation.

Diaphragmatic absorbers are heavy and take up a significant amount of volume in the room.

Looks like you can hide 16 cu ft of treatment behind the couch, maybe more.

Think of the rest of the diaphragmatic absorbers as furniture. They can be a shelf  to place things on or have it just sit there.

Getting the DA near the speakers is an ideal location. Behind the speakers would be great placement.

Diaphragmatic absorbers are broader-band absorption compared to something like a Helmholtz resonator which is an extremely narrow band absorber.

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Yes. However, you have spotted the worse issue and identified it. Bass is the most difficult to get right also the most rewarding. Bass is the foundation of music and when it’s right it’s incredible.

Room is 60% of the sound you hear from your system so it's worth while to take your time, do research and make the investment.

Room acoustics is my favorite thing to talk about in audio lately.

I wrote a lot about my experience putting together a dedicated room here https://www.decware.com/cgi-bin/yabb22/YaBB.pl?num=1662491252 While you're not looking for a dedicated room, hopefully you get some ideas that you can apply to your situation.

Yes, it's a deep rabbit hole. I keep doing research. I'm confident you can find a solution that is stealth and gives good results.