Home made treatment to reduce Bass bloom or resonance in a room?


Hi All,
Has anyone constructed their own panels or treatments for certain areas of the listening room or living room?
I like to listen to my audio system at higher levels; to let the music open up.
I have JBL Studio 230 speakers with a single rear port in each.
I have a problem with Low freq. blooms or resonance; especially on one side of the room.
The walls: painted drywall (sheetrock).
Floor: ceramic tile.
Even with the JBL's six feet from the wall;
I still have the same issue.
It seems like it's just coming from the wall and corner behind the A/V equipment.

I would purchase room treatment or devices if I knew they would work.
If I build my own; it wouldn't be a bad loss if they do not work.

Any input would be greatly appreciated
Ag insider logo xs@2xscratcha
Years ago I made a set of tube and bass traps for a friend. I purchased a book in the early 90’s which I believe is The Masters Handbook of Acoustics. I don’t remember the cover but pretty sure this is the book. Great book which showed how to build traps and many other projects as well. 

https://www.amazon.com/Master-Handbook-Acoustics-Sixth-Everest/dp/0071841040/ref=mp_s_a_1_1?adgrpid=...

Here’s a site I found in minutes that is pretty close to what I built that worked great and didn’t have a lot in them.  Real easy project.

https://www.teresaudio.com/haven/traps/traps.html


Thank you for all the input!

It will help me research this problem and also make a decision on what to do next.
If you can move your listening chair, try different listening distance positions along the center line between the speakers.
Check out ATS acoustics, Piper City illinois. Have a web site. Sell material for making your own panels. Good people to work with. I am not affiliated, just a happy customer.