Here are mine (forgot to capture the cursor position).
A quick overview.
The left speaker is approx 35cm from wall that is packed with pink fluffy.
The right speaker is approx 3.5m from bare wall. I suspect (at least some of) the FRP is actually the open area in the wall through to kitchen. Although the bare wall matches nicely with around 19ms.
Best guess for 2.55ms, the TV. Although the speakers are approx 35cm in front of TV. How an 4-8Khz sound wave goes behind the TV and reflects back to MLP is voodoo!
Best guess for 6.12ms, the rear wall. I have lots of pink fluffy on the rear wall to just above ear level. The front wall if very heavily damped with pink fluffy.
I suspect the region from 7ms through 15ms is is from multiple bounces. Although I would assume their level to be lower.
Originally Posted by jim19611961
Intuitively, the stronger the reflections, the more that they are heard, so the more important the channel to channel balance becomes. Once they are under -20db, the ch to ch balance becomes a bit less significant I would think. By -30db, it may not matter much.
My observation (of my room) is that the right hand side of the room, feels more spacious then the left. The soundstage is centered, and the right hand side is not "live", just a little more spacious. So I would suggest that not only is the level of the reflection, a determining factor towards the listening experience, but also some relationship with the level difference between channels.
ie: At -10dB, greater then 3dB channel difference is problematic. At -30dB, greater then 6dB channel difference is problematic. Of course I don't know the exact numbers, but the relationship makes sense.
I downloaded your mdats from your room thread. There is some strange phase issues in the left speaker. They correspond with the increased comb filtering in that channel. More dampening of the FRP?
Your last ETC graph in that thread shows the kickers to be perfectly matched, however, when I overlay them in REW, the right channel is around 0.2ms delayed, and a little under 2dB down. Measurement error?