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Post by Ethan Winer on Feb 16, 2024 19:56:30 GMT
Yes, filling that void fully with blow-in "fluffy" type insulation will absolutely make a real improvement. I can't tell you how much reduction to expect, and it probably depends on several variables. But your assessment that "it would resonate/reverberate and gosh knows what else" is absolutely valid. When you contact a contractor to do this, they may have a better idea of how much noise reduction to expect. But whatever the amount is, I'm confident it will be worth the effort and expense.
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Post by Ethan Winer on Dec 7, 2023 21:03:55 GMT
in a well-treated room my bet is that differences in gear will be more discernible. Absolutely. And as you implied, most gear these days is clean enough to be audibly transparent. To be notified when someone replies to a thread you're in, click Profile in the top blue bar, then Edit Profile near the upper right, then Notifications. You'll see a list of events you can ask to be emailed about.
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Post by Ethan Winer on Dec 6, 2023 21:46:45 GMT
Thanks Rock for helping out here. I had a few emails with Rick, and he told me you've been helping him.
Rick, you asked if I had anything to add, and I don't. Everything Rock said is correct.
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Post by Ethan Winer on Jul 22, 2023 16:22:07 GMT
The signs of correct calibration curve is 1) if you walk through the room sound remains the same as to frequences ... Room EQ is limited in what it can do. It cannot make the response uniform around the room, especially at low frequencies. Only bass traps and other physical treatment can do that. Much more here: Final Dirac Report
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Post by Ethan Winer on May 27, 2023 16:53:24 GMT
Nice desk!
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Post by Ethan Winer on May 5, 2023 16:30:15 GMT
LOL at "basically he made concrete speakers in flintstones fashion?"
I never hear about stand / platform size being a factor. But that shouldn't matter either if the speaker cabinet is massive and rigid enough.
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Post by Ethan Winer on May 4, 2023 18:06:08 GMT
Hokus: That Alcoholics article got it right about speaker isolation. That's one of the few articles that is correct! Most gush over the "obvious improvement" realized with isolating speaker stands. Rock: LOL, great story. When I got my first subwoofer years ago, a tiny but potent Sunfire, I initially put it next to my 34-inch old-school TV. The rainbow of colors on the entire right side of the TV was intense.
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Post by Ethan Winer on May 3, 2023 16:21:09 GMT
This sentence from the third paragraph of the linked article above by Bruce Black is totally wrong: The energy lost by the inefficiency of a loudspeaker manifests as heat in the speaker driver. If the cabinet vibrates it's because it's not rigid and massive enough. There are many articles (and videos) about speaker isolation, and any that don't come to the same conclusion as my article are just wrong. It's that simple. As for "wobbly" speaker strands that isolate. Yes, they do isolate, but isolation isn't needed. It's like wearing a raincoat on a sunny day. I assure you that the height can definitely make a big difference in the response you hear. This graph from my "Believe" web article shows the low frequency response in a room about 16 by 11-1/2 by 8 feet high at two locations four inches apart. Even over such a small physical span the response changes substantially at many frequencies. Conventional wisdom holds that the bass response in a room cannot change much over small distances because the wavelengths are very long. (A 40 Hz sound wave is longer than 28 feet.) Yet you can see in Figure 1 above that the peak at 42 Hz varies by 3 dB for these two nearby locations, and there's still a 1 dB difference even as low as 27 Hz. The reason the frequency response changes so much even at low frequencies is because many reflections, each having different time and phase delays, combine in different amounts at every point in the room. In small rooms the reflections are strong because the reflecting boundaries are all nearby, so that further increases the contribution from each reflection. Also, nulls tend to occupy a relatively narrow physical space, which is why the nulls on either side of the 92 Hz marker have very different depths. Indeed, the null at 71 Hz in one location becomes a peak at the other. So continue to use books, or buy a nicer stand that lets you put the tweeters at ear height. But don't waste your money on isolation stands.
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Post by Ethan Winer on Mar 16, 2023 16:45:13 GMT
My flawed example was on the song It's My Life by The Animals. I said "the guitar plays a minor third while singer Eric Burdon goes back and forth between major and minor thirds to avoid a clash." You pointed out that Eric alternates between a normal and flatted fifth.
I don't recall anything about a fourth higher.
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Post by Ethan Winer on Mar 15, 2023 16:23:15 GMT
Hex, you have been a terrific resource in this forum. And I'm still grateful you caught the error in my music theory video, where I confused a flat 5 for a minor 3.
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Post by Ethan Winer on Mar 12, 2023 17:08:17 GMT
The RealTraps diffuser wells are made of Gator Board, a type of sturdy cardboard, with rigid fiberglass behind. So bass goes through the cardboard but mids and highs are reflected / diffused.
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Post by Ethan Winer on Mar 10, 2023 19:53:14 GMT
I think the quarter wavelength idea is more theory than practice. I mean, if 2-inch rigid fiberglass measures as fully absorbing 400 Hz, then there's your answer. Of course, we know that spacing the fiberglass off the wall absorbs even better and to a lower frequency. And 1/4 wavelength spacing puts the fiberglass where wave velocity is maximum.
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Post by Ethan Winer on Mar 7, 2023 16:06:23 GMT
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Post by Ethan Winer on Mar 6, 2023 17:31:02 GMT
If sound has to pass through small holes to get to absorption on the other side, that will not help much.
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Post by Ethan Winer on Mar 5, 2023 17:21:59 GMT
I'm not sure what you're asking. And what are the yellow dashed lines?
If you want to make the ceiling into a bass trap that's a great idea. But the absorbing material should be fully exposed to the room below. So the entire ceiling should be thick absorbing material. Also, the side-wall reflection areas should be treated with absorption, not diffusion. Diffusers are best used in the rear of the room behind you.
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