Originally Posted by Mpoes12
That's a fairly high reverberation time. Do you mind sharing more details about your theater, maybe sharing a picture? How were the 10 panels constructed and where are they placed?
The echo you describe sounds like flutter echo or slap echo. That is both easily fixed and very hard. It doesn't take thick treatments to solve it but they have to cover a portion of one of the offending walls. It's typically caused by two parallel surfaces but odd perpendicular surfaces like soffits can also cause them. It's hard because it's often caused by a wall you don't think or want to treat. Like the ceiling!
Could you share your etc and rt60 plot by chance?
Sent from my iPhone with a keyboard that predicts what I mean very poorly
Mpoes12: I can find them later, or maybe just do a new run. Measured via REW and a pair of calibrated mics (to see if they both produce the same readings for sanity's sake, and they show the exact same issues)
The room is just a basement, not HT specific construction. Overall shape is a quasi-L and I am forced to go the "short direction" in the rectangular part. 17'x21'. The L portion is 12x6 and is attached to the aforementioned 17'x21' to the left of the HT.
The rear wall contributes a few very high peak reflections, and I have some random ones strongly reflecting off of two or more surfaces that add up to almost 40' of distance before getting back to the listener. I've found many of the locations by just holding up a thick blanket and going to different places and holding it up while running a test, so I know where the worst surfaces are. Unfortunately they are all over the place, depending on the frequency we have all kinds of surfaces causing an effect. Also have massive nulls in the 100-150hz arena, but I want to get the slightly higher frequency stuff tamed first, and hope the 2" will get the process rolling. Then move on to working to tame more specific areas.
I have two options for main speakers, NFR 6-45s and Magnepan 3.5rs. As ribbons they should not have as much effect as others with the ceiling, when I held up a blanket against the estimated first reflection points on the ceiling there was no major difference in the reflections shown in REW. Floor is a rug covered concrete.
I can't put individual panels up in the required locations due to artwork on the walls. Plan was to cover entire walls then replace the artwork over it. Not perfect, as it would reflect some HF, but they are uncovered canvas, so nothing as bad as glass covered paintings or something.