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Post by Hexspa on May 31, 2016 2:48:29 GMT
From what I understand the target response curve is +-10dB not +-5dB like you keep mentioning. Therefore there is no deviant peak at 350Hz. I get that the majority of the curve you're posting is within +-5dB but I mentioned the former as a general standard, not a reference to your specific plot. realtraps.com/art_monitor.htm at the bottom under Al Fine. Also in that article is the reference about decay time being under 500ms. While it doesn't say, I'm assuming that's RT60 while I understand your pdf to give an RT30 time. Additionally, from what I remember, Ethan tends to prioritize response at or above 50Hz. So, all told, your reverb time at 50Hz is 1.18 seconds and at 63Hz is 980ms and therefore not ideal according to the source given. That being said it's a garage and not a purpose-built control room so expecting an "ideal" decay time might be pushing it. Thanks, -m
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Post by starandchlorisse on May 31, 2016 4:15:04 GMT
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Post by Ethan Winer on May 31, 2016 17:10:31 GMT
Reverb is usually measured in octave or third-octave bands. That's not suitable for assessing low frequencies. A high resolution waterfall is much better.
If you use EQ to reduce 350 Hz, check other places in the room to be sure you didn't create a null.
If you put thick wood diffusers in front of bass traps, that might block bass waves from getting into the traps. You can avoid that by using thin light wood or even cardboard for all the well bottoms.
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Post by musicfirst on Jan 5, 2017 5:57:17 GMT
Yes, if you bond (spray glue) thin plastic film to the front of the rigid fiberglass it will absorb more bass and less treble. I don't know if diffusers will make the room any flatter at midrange frequencies. It will make the reflections coming back from that wall less "coherent" (so less comb filtering) and make the room seem a bit more spacious. --Ethan Ethan and the gang: Gluing a reflective material onto the face of a panel seems to be a good idea for all but first reflection points. Does the thickness and type of film matter? Thanks Kerry
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Post by Hexspa on Jan 5, 2017 8:59:34 GMT
Paper works. Ethan says plastic works. You could assume tinfoil would work but I'm not sure if anyone's tried.
My guess is that anything less than 1/16th of an inch is best. I'm using the kraft paper off my R-19.
I'm guessing anything with too much mass won't help - depends how loud your music is.
If you can rattle a license plate on a car with your bass then that kind of layer could be useful.
My understanding of this membrane concept is that you're using the sound energy to move something which itself gets slowed down by the insulation - so you're transferring the energy which ultimately becomes heat.
This is instead of just using friction on air which is what you normally get - you're moving something more dense and heavy and it's "harder" for the sound to do.
But maybe I need to learn physics.
-m
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Post by rock on Jan 5, 2017 13:16:18 GMT
IIRC, Ethan has mentioned plastic the thickness of a garbage bag. That varies but is quite thin. I found .7 mil plastic sheeting at Home Depot. It's cheap.
Cheers, Rock
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Post by Ethan Winer on Jan 7, 2017 19:24:48 GMT
Yes, to all of that. Thin paper or plastic film or cardboard etc. But be sure it's bonded to the rigid insulation behind, not just floating in front unattached.
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