5 votes

Can noise be reduced by 7 decibels with a curtain?

They missed out one vital piece of information - at what frequencies? They'd need to be made of lead to stop anything below 100Hz… I wonder whether their mosquito-repellant curtains work when they'...
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  • 7,024
4 votes
Accepted

Are styrofoam skyline diffusers efficient as wood?

Diffusers are meant to reflect and scatter incoming sounds, not to absorb them. Polystyrene is quite transparent to low frequencies, so the more rigid wood is the better material. A more precise ...
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4 votes
Accepted

What sound is best for measuring which frequencies a wall is reflecting?

If it helps, there are a couple of tools you can use to measure room acoustics. REW https://www.roomeqwizard.com/ and Sonarworks reference https://www.sonarworks.com/reference. It's been quite a while ...
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3 votes
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How does a cardboard paper towel roll amplify the sound?

Quite an interesting project indeed. The paper towel roll and cups are are working as an acoustic megaphone, also called (in ancient times) speaking trumpet. Directional focus of the radiating sound ...
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3 votes
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Purely Mechanical Acoustic Frequency Converter

By far most passive acoustic systems are linear and time invariant. As such, they don't create frequencies not present in the original signal. Passive systems that aren't linear are typically of the ...
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3 votes

What would be the best "egg-carton" acoustic treatment method?

You need to ABSORB sound partly to reduce, and partly to keep it from bouncing around (which is why it sounds like a bathroom). So THICKER things like heavy curtains or moving blankets (or quilts) or ...
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3 votes
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What is the best shape for passive sound amplification

The best shape for high frequencies (and some high mid) is the horn. But a horn can actually take many shapes. For example, its walls can be parallel like a didgeridoo. In fact, most, if not all, wind ...
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  • 1,553
3 votes

best material to absorb Sound

Depending on how creative you want to get, the most effective sound absorption material I have found so far has been rockwool - which is the material often used for ceiling insulation. You can easily ...
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  • 8,374
2 votes

What are good alternatives to studio foam for a home studio?

Acoustics is a deep subject, but here is a pretty good primer: http://ethanwiner.com/acoustics.html That said, a simple and excellent solution is to make absorption panels yourself. Make a frame from ...
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2 votes

Can sample-based virtual instruments and an excellent digital piano recreate tone color?

I don't think you can substitute a piano with our current technology. The main problem I see is that even with a fully weighted electronic keyboard the player would not have the same physical feedback,...
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2 votes

Does the shape of an acoustic/vocal booth matter for maximum isolation?

More important is the isolation. I highly recommend using 3“ (or thicker) stone wool insulation completely covering the ceiling and walls on the inside. Cover it up with cloth so it's pretty, do not ...
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2 votes

Simulating Resonant Bodies

I don't know if this is exactly what you need, but in my experience I've obtained interesting results using IRs of several bodies, e.g. Altiverb's IRs have a really awesome "Design" section with IRs ...
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2 votes

How can i prevent/reduce bass trapping?

Some monitors allow you to adjust the bass response for the purpose of corner placement and the like. But since you ask, I suppose yours don't have that feature. See this forum for flush/soffit ...
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2 votes
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what is the purpose of the internal volume of a speaker cabinet

It's actually a complicated thing, how much space to put behind a driver. The air mass behind the driver actually affects how the driver moves. If you put the right volume of air behind the driver, ...
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  • 2,030
2 votes

Advice on calibrating complex stimuli that vary in amplitude and also decay over time

I don't know if there's an instrument that can measure this but you can calculate the RMS value of complex waveforms in many ways. It would include some maths so I would personally recommend using ...
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  • 1,553
2 votes

Do I really need to dump tons of sand into the stage i'm building?

I've worked in a few large stages (<5000) people and I have never seen a stage filled with sand. The stage is usually an aluminum construction made of lite decks or even steel decks. This is ...
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  • 1,553
2 votes

standing waves in strings

Let's use some simpler numbers to illustrate the problem. Let's say the smallest string on a piano is 1m, and has a frequency of 200hz (it's a piano for giants). And let's say the lowest note on a ...
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2 votes
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Acoustics exercise

Sabin formula for Reverberation Time: You know the target RT and the volume of the room. What you are looking for is the total absorption A, S is just a surface area. Technically, the unit of A is ...
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  • 299
2 votes
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How to interpret the analog output of an SPL meter?

Based on a suggestion by Jojek in a comment, I tested the DC output using a sinusoidal signal of stepped amplitude: The results are given for 90dB SPL, 80dB SPL and 70dB SPL as read on the meter ...
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2 votes
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Why not pointing the loudspeaker toward the sky during open-field frequency response measurement?

speakers don't just emit sound towards the front, they emit sound in 360 degrees despite the efforts of designers. Higher frequency drivers are more directional than lower frequency drivers. The lower ...
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  • 8,374
2 votes

Effect of sound waves striking an object

Interesting topic! If you first imagine that sound waves emanating from a point source (which you are going to have to approximate as a speaker) will emit spherically. Where the sphere intersects ...
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  • 8,374
2 votes

Setting up Home Studio, need advise on setup

In a tiny room like that, with unspecified materials, the quickest way to find out is to try it. My optimum in a home studio ended up being this… My ceiling is also partially sloped. Room is approx ...
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  • 7,024
1 vote

Question about the Haas Effect

His wording is confusing, but he does mean that the two channels, the original and the duplicate, should be panned hard left and right. The whole point of using the Haas effect is to maintain the even ...
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  • 166
1 vote
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How does "transcribe!" or guitar tuner work?

Windowed FFT is indeed one of the usual approaches to find an approximation of a spectrum within every window - and there is a trade-off here, as wider windows mean worse time resolution, while more ...
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1 vote

Can I get a recommendation on how big and what type/brand of PA I need?

I would look for sound design companies or at least PA equipment vendors near you to give a recommendation; without being physically in the room it's impossible to give solid advice. Even a couple ...
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  • 206
1 vote

Designing a diffuser to direct reflections to side walls

A diffuser is used to scatter sound waves unevenly so the surface needs to be also very uneven. So you need a mildly reflective material such as wood or cork cut out so that it has edges and crevices ...
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  • 1,553
1 vote

How does a cardboard paper towel roll amplify the sound?

Pitch content that roughly matches the resonance tendencies of the shape will also get a boost relative to the other frequency content. The resonance frequencies of the tube are probably very limited, ...
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1 vote

What would be the best "egg-carton" acoustic treatment method?

I covered my dorm room with egg cartons when I was in school. We used contact cement or a tough rubber cement (I think it was called "Goo") to stick them to the walls and ceiling. I agree with the ...
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1 vote

What would be the best "egg-carton" acoustic treatment method?

Egg cartons won't do much of anything. There's a lot of research on this on sound engineering forums. Get yourself some acoustic panels instead.
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  • 300

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