Absorbing traffic noise with Helmholtz resonators (video)

Now imagine many tubes bottles ( 100 ) ,with various neck volume and lenght, from 8 foot to few inches, all tuned and located on the right spot (some near the speakers woofer or tweeter others beside or near me and some near wall reflecting location ) ...😁

I miss my crazy room where the soundfield were completely holographic as a completely surround system i even use foldable screen with devices on them etc ...

Now i am in near listening in a smaller acoustic corner but my system speakers are more accurate in the high  frequency response than my bigger Mission  and  because i modify the porthole design and the waveguide then i improve the bass and medium so much  i am glad too... And my headphone modified gave me a speaker soundfield... Then i enjoy 2 systems instead of only one now...

Helmhotz is the greatest modern acoustician...😊 I will put dr. Choueiri beside him ... And Dr. Gorike founder of AKG and the designer of my hybrid headphone : akg K340 ...

Fun experiment. Thanks Mahgister👍

Interesting topic to me….I was not one of the naysayers who actually experimented with @mahgister bottle Helmholtz resonators.  I liked using 4 - 1.75L Bourbon or other bottles with long necks.  More is better but I had to control myself.  I added 1-2 inches of water, drilled holes in the caps and inserted various sizes (2-4 inches various diameters as well) of straws through the holes with a tight fit.  Set them up about halfway between the system and sitting position on an arc.  2 between the speakers and 1 outside of both speakers.  As crazy as this sounds it filled the room with a fuller more 3D sound bringing the music further into the room. It is a subtle improvement in my environment.  I only use  4 bottles so I can easy pull them out when I want to use them and no one is around.  My reputation to a hit when people saw Bourbon bottles spread throughout the room with straws in them.  🤣

Fun experiment.  Thanks Mahgister👍

@hilde45 

Fascinating stuff! Thank you for posting.

I am involved with a number of horizontal drilling locations that either are inside cities or the cities are encroaching on us.  When you frac a well (and just drill a well) there are huge diesel generators (and pumps, and well, a giant drill) that humm along for a year.

Our noise is usually within a pretty fixed frequency range, so we've done a lot to address this.  Generally giant berms of dirt to reflect sound "up", coupled with large hanging helmholz panels several stories tall.

When the production phase is over, it's berms, some fixed relectors/resonators, coupled with natural absorption -- I like to plant Afghan pines and Texas live oaks (both keep their leaves all year and don't particularly require watering after being established after a year).  The pines are soft wood and the oak hard and do very different things to sounds.  But a triple row of mixed species does a lot, both in keeping things looking nice and absorbing the periodic banging of metal and trucks doing their thing.

We have several in residential neighborhoods.  It looks like a nice greenspace.

Planting buffallo grass also helps (a very tall native grass in west Texas, almost a bamboo) -- and it attracts a ton of wildlife -- unfortunately also rattlesnakes, which, in turn, like to hang out on concrete pads under warm diesel engines or cool metal sheds, depending on the time of year.

So that's a rather tough sell to workers.  LOL.  Don't blame them.

Very interesting exploration of Helmholtz theory and application. As someone who has had the opportunity to experiment with an Acustica Applicata Polifemo in a real world listening environment I can tell you that these really work and can eliminate unwelcome bass nodes and frequency anomalies without the use of signal degrading DSP filters or electronic equalization. Once properly positioned and tuned within the space the Polifemo simply and effectively smooths out the bumps that can intrude on the presentation. Highly recommended!

Tuesdays are my Mondays....pardon.....*wry L*

@waytoomuchstuff ..."...tire deflation strips ..."

Remind me to tiptoe past your home....*?*

What was that recent movie 'bout not making the slightest noise or sound....or the creatures would attack you...? 😏😎

@hilde45 ....I'm 'down with" the Art of Noise, tho'....  Big fan longtime with the AON... ;) 👍

Big fan of educated people as well, @mark200mph ....*G*

I am glad there are educated people in this area to help us enjoy the music thanks.

@hilde45 

This certainly falls into the "Gee, I never thought of that!" category.

Very interesting.  Much more socially and environmenatlly friendly than tire deflation strips to reduce traffic noise.

Thanks for sharing.

@asvjerry A.I. did come to mind for me, too. Acoustics is inordinately complicated and the additional computational power already being deployed in headphones and other applications might be put to work in dealing with room noise.

It would be fabulous if we could drop the noise floor of nearly any room, anywhere. This would make listening rooms amazing, but also restaurants and other crowded spaces. 

In short: Down with Noise!

@hilde45 ...Thanks, I've bookmarked that talk....👍

Acoustic environments are complicated....large or small, the large ones done in the past are fraught with 'good ideas' that ultimately didn't pan out, then subjected to 'tweaks' and measures that 'worked' but spoiled the 'intended concept' of a space and its' attempt at a beautiful yet practical environment.

One can wonder if an AI aimed at the task of 'taming this sort of beast' would be able to cope with the conundrum....?

Or would it just get pissed and retaliate....*L*

Those that scoff have no ground. I’d love to experiment if even simply to learn of the possibilities 🙏🏼👍🏼

Interesting. 

Pretty cool stuff! 😎

Incredible important information... Thanks Hilde...

I think my research are motivated among other papers by this Russian Paper of 2017...I just begun this video about Helmholtz resonators too ...

I used 100 tuned Helmholtz resonators in my past room... The results were stunning with a soundfield filling my room and the speakers were disapearing... I used also many others devices though to contribute to this as experiments.

https://www.researchgate.net/publication/318280591_Sound_Absorption_by_a_Helmholtz_Resonator

Incredible information in this video about the increase of heart pressure and 10 decibels of sound too much...

I used also many Schumann generators ( low cost) 13 of them and it is easy to spot the impact when well located in the room or near the gear...

I stopped talking about these here because too much idiots harassed me with insults... I am not patient then i reacted too much....😁

But with this interesting information to study i will be able to talk about this anew if necessary ...

Thanks hilde45....

https://docs.google.com/document/u/0/d/e/2PACX-1vR35aK_WLIXPrQB-wbb_1iPNBEmbF4NuopNZh-GVb80JCDIQyYJto53dbjvqFpv5RWSMnkIB9Bc_uYp/pub?pli=1