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Post by superace on Mar 14, 2021 7:26:09 GMT
I recently built some panels and before I put them all up I wanted to do a quick before/after room measurement, but I must have done something wrong because the SPL graphs look virtually the same. The waterfall graph shows less ringing, but that seems to be about it. I do need to retake the measurements again because I realized I measured it right in the middle of my room instead of 38%, but at the moment I feel like that doesn't matter too much since the measurement with the panels doesn't show that much improvement. My panels were built out of denim insulation. I took two separate 1.5 inch insulation and spray glued them together for a 3 inch panel. Their measurements are 48x16. For the panels that were bass traps, I also added attached contact paper to the front to help with the low end. All my panels have a 3 inch air gap. I only put up 10 panels for the test. 8 of which are in the corners for bass trapping and two of which are for my RFZ. The waterfall graphs look good though. They show about a 300ms reduction across the board up until about the 200 range. Then it looks a bit confusing to me? It looks like something funky is going on there. The panels seem to add ringing below the 20 mark? But the graph without panels doesn't have any of that. I've attached some screenshots I took from my left speaker. I tried to add the REW files, but they were .1mb too big even after putting it in a zip.
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Post by superace on Mar 14, 2021 7:28:39 GMT
Adding SPL measurements. Red line is without panels. Green line is with panels.
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Post by Hexspa on Mar 16, 2021 12:00:16 GMT
A few things.
1. Your SPL is good so no need to worry. A bit of a peak at 60Hz which could be due to being center room. Either way, you can maybe use subtractive EQ to bring it down a bit.
2. Panels are mainly about reducing ringing. They also manage higher reflections but you don't seem to have any issue. Is that graph smoothed?
3. 10 3" panels at 48x16" made from shredded denim is on the lower side of optimal coverage and thickness. Usually 4x2' is the standard size and 3" would be too thin for even rigid.
My decay target is 20dB decay within 150ms above 63Hz. You can use the decay plot to see how far you are away from that. If you go beyond that then you can simply add more panels.
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