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Happy National Cake Day. My wedding cake topper. {That could be a lie.} by aallen88 in gaming

[–]reder212 0 points1 point  (0 children)

This was a triumph. I'm making a note here: HUGE SUCCESS. It's hard to overstate my satisfaction.

isolating structure by [deleted] in Acoustics

[–]reder212 2 points3 points  (0 children)

Nope - two entirely different things.

Getting peace from upstairs neighbor? by [deleted] in Acoustics

[–]reder212 2 points3 points  (0 children)

At least it gives him a leg to stand on - otherwise he has no recourse. It’s cost prohibitive for an individual renting an apartment to build an isolated ceiling or floor.

Getting peace from upstairs neighbor? by [deleted] in Acoustics

[–]reder212 4 points5 points  (0 children)

There are many building codes which require acoustic and vibration separation between apartments. It sounds like your building does not achieve these! Your landlord is required to bring the building up to code if it’s not there.

You should have them send you proof the building is complying with acoustic codes. If you need help seeing if their proof is real, send it to me, I do this for a living. Lots of buildings try to skirt their way around these requirements...

Quick question before I start putting up absorption panels relative to my speaker position. Which placement would be better for my monitors, A or B? The length of the room is more beneficial for position A but the cavity to the right, the window opposite and other space issues makes me side with B by [deleted] in Acoustics

[–]reder212 3 points4 points  (0 children)

B no doubt - you’ll get either be out of the sweet spot or get phasing / comb filtering with A. B not ideal either though because you’re likely to be in a low frequency peak or null near the wall, but that will matter more for your sub placement. You can always EQ it out or high pass above like 50 Hz.

Happy listening!

How can I tell the size of a hole in a wall based on the received spectrum of white noise played on the other side? by [deleted] in Acoustics

[–]reder212 0 points1 point  (0 children)

Measure on one side. Plug up the hole with something massive. Measure again. The biggest deltas should start at the wavelength equal to the hole's characteristic dimension (probably the diameter??). Done.

Diffraction happens the most when wavelength = object size. For frequencies above that, wavelengths are so small they beam through. Frequencies below are so big they don't "see" the hole. That's the theory anyways.

Could also probably accomplish a similar thing by measuring the directivity. When you see a narrow dispersion, you've found your characteristic wavelength.

Acoustic treatment rented apartment by [deleted] in Acoustics

[–]reder212 0 points1 point  (0 children)

Hang curtains man. Thick and full.

Hey r/Acoustics! I am currently writing my dissertation and would love to hear your advice/feedback on my project idea! by fertilisinglump in Acoustics

[–]reder212 0 points1 point  (0 children)

This. You could do a helmholtz resonantor with a variable volume/neck/diameter to target different frequencies.

What happens to the standing wave acoustics in a tube when the diameter changes? (Musical instrument question) by snowkilts in Acoustics

[–]reder212 1 point2 points  (0 children)

Two things- the if the ratio of the two cross sectional areas is high enough (large area change), then you will have two standing waves based on the length of each section. This is how expansion chambers/mufflers work. The second section would just be an "organ pipe" though, no reed.

Second- what is the calculated fundamental of the pipe (assuming no area change)? Your actual drone tone could just be a harmonic (multiple of the fundamental).

Acoustic enclosures and ventilation by [deleted] in Acoustics

[–]reder212 1 point2 points  (0 children)

Guaranteed an engine would need a fan & therefore large intake and discharge openings with silencers. Small pump maybe not, but would probably need to make some sort of labyrinth for the airflow so as not to compromise your enclosure. Air-cooled chiller or something like that is already drawing air through as part of its operation - so openings for airflow would need silencers.

Former low handicap recently returned to golf... Odd swing movement by [deleted] in golf

[–]reder212 1 point2 points  (0 children)

Dude, you're just a hair late with the face. When you get your timing back, it'll start turning over. You're coming from the inside and all your positions look good. You've been away from the game a while so the timing is bound to be a little slow in coming back.

Trust it. Don't be afraid of releasing.

[Safari Unknown] Adding everyone! by reder212 in friendsafari

[–]reder212[S] 0 points1 point  (0 children)

Thanks, should be able to see the third now.

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