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Post by Ethan Winer on Mar 30, 2016 16:37:01 GMT
Even a small wash cloth absorbs something at 50 Hz. Though not much. It's all about size, and thickness, and it's all proportional. A trap twice as large absorb twice as much and improves the room twice as much. --Ethan
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Post by Ethan Winer on Mar 27, 2016 19:51:23 GMT
You're asking tough questions that I don't have good answers for. But I know who does know for sure: www.bksv.com/Library/Application%20NotesThere are a lot of variables, and I agree that measuring reverb is better done farther from the source. But small furnished rooms don't have true reverb, so that's not the best way to look at it. We mostly care about what happens at the listening position in front of loudspeakers, so that's the best place to measure such rooms. --Ethan
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Post by Ethan Winer on Mar 23, 2016 18:27:52 GMT
The SVS model has better specs and costs $100 less. I can also tell you that my SVS sub is fantastic, and they have an excellent reputation. In all the years SVS has been around I can't recall reading even one complaint about them. So the SVS would be my choice. --Ethan
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Post by Ethan Winer on Mar 23, 2016 18:22:55 GMT
The only way to know for sure is to measure the LF response at high resolution as you experiment.
--Ethan
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Post by Ethan Winer on Mar 23, 2016 18:21:45 GMT
It depends. For measuring loudspeaker response you definitely want to point the microphone directly at the speaker. And for room response you probably also want to point it at the speaker. But for measuring reverb time you probably want to point it away from the speaker, and put it farther away from the listening position. --Ethan
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Post by Ethan Winer on Mar 21, 2016 17:01:58 GMT
I always LOL at people who say they have a small / terrible room and ask if it's even worth treating it at all. That's like saying, "I haven't eaten in three days. Is it even worth eating half a sandwich?"
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Post by Ethan Winer on Mar 21, 2016 16:59:16 GMT
I have no idea. I also don't understand where the 4.5 inch difference is. Even in a well treated room the sound changes at least a little as you move around. --Ethan
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Post by Ethan Winer on Mar 19, 2016 17:34:19 GMT
Absorbers only 1-2 inches thick will target 400 Hz just fine. I'm suspicious whether this is really your problem. Is it possible you have a vase or picture frame something else that's ringing?
--Ethan
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Dude
Mar 19, 2016 17:32:40 GMT
Post by Ethan Winer on Mar 19, 2016 17:32:40 GMT
Panels meant to absorb bass should be at least 3-4 inches thick (7-10 cm). So don't use panels thinner than that, even if you have a lot of them.
--Ethan
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Post by Ethan Winer on Mar 19, 2016 17:30:40 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
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Post by Ethan Winer on Mar 19, 2016 17:27:35 GMT
I'd use six panels as they are, at 2 inches thick, and put two each on the left and right sidewalks and ceiling at reflection points. Then double up the other 12 panels to make six bass traps each 4 inches thick, and put them in whatever corners you can manage.
Actually, looking again at your photos, you can probably get away without the two panels on the ceiling because the ceiling is high and angled. So make one more bass trap 4 inches thick.
--Ethan
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Post by Ethan Winer on Mar 19, 2016 17:23:35 GMT
Even a good omni microphone has a flatter response when aimed at the source. So where you aim it depends on what you want to measure. With better microphones that are flatter off-axis, it matters less. Pointing up is useful when balancing loudspeaker volumes. Otherwise, to measure response it's best to aim it directly at the speaker.
I have an good quality DPA measuring microphone so I didn't need to get it calibrated. But even if I had only a Behringer ECM8000 I probably wouldn't bother. Decent mics vary a few dB, versus rooms that vary 30-40 dB or more. So using a calibrated microphone is sort of like measuring your height to the 1/64th of an inch.
--Ethan
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Post by Ethan Winer on Mar 18, 2016 17:58:44 GMT
I never tried that exact design so I can't say for sure how well it works. But anywhere thick bass traps can be put will only improve the LF response.
--Ethan
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Post by Ethan Winer on Mar 18, 2016 17:51:27 GMT
What more can you do? I don't know, it looks done to me! --Ethan
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Post by Ethan Winer on Mar 18, 2016 17:46:30 GMT
1. Sure, you did a good job, and the response is clearly much better after adding the treatment. The waterfalls are also greatly improved.
2. You already have the response within a 10 dB window, which is very good!
3. Diffusers do nothing for the bass range. They'd have to be a few feet deep to get down that low, and you don't want to diffuse bass anyway. I imagine your room sounds vastly better now. But if you're determined to continue treating even more, I see a few places on the ceiling and side walls where more absorbing panels could go.
--Ethan
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