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Old 3rd June 2020
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Originally Posted by voodoo4u View Post
I have a live room that I'm fairly happy with but for the frequencies in the mid range.
I find that reverb tails are a little long in this area and I'd like to absorb frequencies in the 1-4k range without affecting my highs.

I thought that building typical Roxul traps with a reflective surface that would absorb frequencies in the 1-4k range yet reflect above 4k would be ideal. I've looked for charts that will give me an idea of what materials would pass up to 4k yet reflect above that, but I've not had much luck. Thin plywood? Thick paper? Tin foil? Would anyone here have any ideas or suggestions?
Have a look at Schultz for high frequency cut off and vary the depth of absorbent material for the low frequency cut off.