What room treatment product have transformed your room or audio system?

I made (8) 4' x 2' x 2" panels, with fabric, mounting hardware and shipping costs for just over $200 with products from ATS Acoustics.
I mounted 6 of these in my home office and it made a dramatic improvement in the sound of my system.  The other 2 panels got mounted in our family room to help tame some of the echo that was present.

OP:

While I did answer your question truthfully, it is also true that my room, with just the Soffit Traps would still not sound good.

You need a critical mass of room treatment to reap the rewards, so I agree with the statements above that it's a combination of traps, diffusors and absorbers, strategically placed, that are totally worth investing in.

I would not approach this as an experiment of individual tweaks.

Best,

Erik

Anthem ARC Genesis.

Anthem ARC Genesis also

GIK