Tell us about your acoustic treatments

Did any of you do decay time measuring

Primacoustic panels for ceiling, front wall, side walls and back wall. Thick area rug covering most of wood floor. No rack of gear between the speakers. No TV between the speakers. No coffee table in front of listening seat. 

I did a reno of my two channel listening room (our living room - most of the family’s actual "living" takes place in the back family room), turning it in to dual duty as a projection-based home theater and 2 channel audio room. I involved an acoustician in the design.

We did a drop-down ceiling which contains acoustic absorption at strategic points (including some very large areas of bass-trapping-type structures), but it’s all hidden in the drop down ceiling which has a felt-like material stretched over it. This makes the drop down ceiling look like a solid ceiling, when in fact it’s got all sorts of absorption properties (also which kills light reflections back to the screen).

The room has a large shag rug and an over-large custom built sofa. The walls are uncovered except that I have thick brown velvet curtains that can be pulled to any location on the walls, to modulate reflectivity as desired.
This has all worked wonders. Any speaker I drop in the room tends to sound fantastic, and I can modulate the reflectivity depending on the speaker, or even on what type of sound I happen to desire.

In fact there is an added acoustical bonus: I designed a 4-way automated masking system for the screen wall behind my speakers. The projection screen is about as large as the whole wall, but I have full control of it’s size and shape by remote-controlled velvet masking - horizontal and vertical. So from the same remote I use for volume when listening to 2 channel music, I can alter the position of the masking - drawing the masking in over the screen increases absorption behind the speakers making for a more intimate, lush and subtle sound. The more I open up the masking, exposing more reflective screen surface, the more open and airy the sound becomes.

I’m a fan of flexibility so this all works great for me.

@kgveteran : I did measure decay time, but I haven’t done it for a while. The main improvement that bass traps give, IMO, is reduction of bass decay time.

Dropbox link to early graph.

I have 3 Gik Monster Bass traps, 6 Gik 244 traps, 3 other generic fibergalss (?) panels mainly for slap echo.  
I also took the metal doors off the closet in the back of the room and use that closet as another bass trap since it is full of hanging clothes and folded towels.

I also hung curtains along one side wall.

I’ve really started to look at tuning the room as an important factor as anything else in a system.  Reductions in image smearing and bass overhang really tighten up the musical presentation!