What are the best Room Accustic Treaments members have found?

Asc is the company I have used . They don’t charge you anything upfront for their recommendations. They even sent me equipment, free of charge, to record tones played back through my sound system, recorded from my listening chair so that they could assess articulation and the problem frequencies that needed taming. They then sent me blue prints on what they recommend to be done in phases, based on videos , pics of my room and the results from the above sound recordings.
Jordan  is the sound engineer i work with and he bounces all ideas through Art. They are always available to answer your questions and they were and still are a pleasure to work with.

Books, shelves, art & carpets.

But then, I spent a few decades in sound studios, so I'm probably odd man out here.

To trail onto this thread, does anyone know of room/wall treatments that are not a few inches thick? Is there such a thing?

Due to the room, anything thick sticks like a sore thumb. Thinner that can be painted would be a jackpot.

I apologize davidrolson, I do not mean to hijack the thread.

GIK service and products are very good and competitive.  Keep in mind, they carry NO inventory; everything is made to order.  It’s how they keep their prices down.  My salesman told me today, an order placed today would deliver 2nd week of January, at best.

The suggestion to read up on the subject is a good idea.  GIK has some good You Tube videos.  So does Acoustic Geometry but they’re very expensive.  Lastly, GIK list their suggestions in the order of importance.  If you have the patience, purchase one solution at a time.  I think you will make more cost effective decisions (if you can be patient).

Best investment you can make to maximize your investment.

Cheers

If you’re looking for simplistic old school acoustic treatment you can do every bit as good as GIK only faster and for a tiny fraction of the cost stretching whatever fabric you like over Owens Corning acoustic panel. In fact if you look at their website they have the exact same OC panels. If paying $1k for $50 worth of room treatment is worth it to avoid having to learn how to use a sheetrock knife, go for it.

GIK is simplistic old school treatment. Next generation and so much more effective you can hardly believe it are Synergistic Research HFT. They make these in different versions designed to go on walls, ceiling, and speakers. Unlike the panels that do very little really, and nothing that like someone already said can be done with furniture (carpet, etc) these things are insanely effective in improving imaging, extension, detail, dynamics, essentially making your speakers, and walls even, disappear.

I’ve done panels, traps, corner tunes, you name it, going back to the 90’s. Actually my 1973 teenage bedroom had egg cartons, functionally identical to GIK just not as pretty. Compared to HFT that stuff is stone age. People I guess are slow to catch on. So you get a lot of advice from people stuck in the 1950’s. Go figure. Free 30 day trial. Which don’t worry, you will not be sending them back.