LOOKING TO IMPROVE THE ACOUSTICS OF MY LISTENING ROOM

If you send room pictures to GIK Acoustics, they can make suggestions. 

@kjl1065 

This is a very wise step wanting to consult a professional. Most people here want to do it themselves. I hired an acoustician to design my room and I built it while my speakers were being built. I knew I didn’t have the knowledge to try it myself and wanted to get it right the first time. I strongly recommend a consultation with Jeff at hdacoustics. He is very good and I am extremely happy with my room. You want to control your room not let it control you. You won’t spend years guessing what goes where. Good luck!

I was in your situation and what I did was use GIK’s online resources and they had a sound engineer working with me. It’s basically free and relevant consulting.

On their website, you request a free recommendations/estimation and you submit drawings with measurements and photos.

Naturally, the more detailed your drawing(s), and the more photos you can provide the better and more accurate their recommendations can be.

I think this will give you a very good, if not final so at least a solid first, idea about what type of treatments, absorbers/bass traps versus diffusers, for example would be useful for you.

like many things, I think it’s the 80/20 rule – you can get quite far this way and then you need to spend a whole lot more time, money and effort to get further but the nice thing is that you can decide on that later, after you’ve taken this first step

Good luck.

I strongly recommend a consultation with Jeff at hdacoustics. He is very good and I am extremely happy with my room.

Because your room was initially overdamped, you added diffusion down the road, if I remember. Was that because he didn't suggest it or because you decided to not take his advice at the start? Because if he didn't suggest diffusion at the beginning, that, in my opinion, was a mistake on his part. 

I used GIK and then was able to speak with them on the phone to help me further understand the process and what would work.  The size of room and type of speakers are all factors you must consider. My space is small and am using Martin Logan Electrostatic speakers, being dipole speakers a lot of sound is going towards the front wall, given my small space controlling that was huge so absorption on the front wall was key.   
bottomline I think GIK’s free advice is a great place to start and do speak with them directly, don’t just take the recommendation and run with it. 
made a huge difference in my room.