Miracles in Audio, by luck, by good choices,by design or by tweaking...

AN IMPORTANT FACT ABOUT HELMHOLTZ RESONATORS USED AS DIFFUSERS






The underestimated fact of their powerful capacity as sound diffusion engine...

I used them like resonators to damp and enhance some frequencies.... With mechanically tunable straws of different diameter and lenghts as necks...

But i used them also not only as tubes and pipes resonators but as DIFFUSERs with 2 big empty glass water bottles of 50 liters with larger hole for the neck ( few inches) and this hole topped with 2 or 3 cardboard large tubes neck covered with thin fabric clothes and with some plastic surfaces punched with many small holes over it ....


The result is stupendous in my 2 listening position... They are very powerful diffusers.... And diffusion is very important to control in the right balance with absorbtion and reflection....

Cost: peanuts....





Here are some of the acoustical science facts i used:

«Change the volume of the air cavity, or the length or diameter of the neck, and the frequency of
resonance changes. The width of this absorption band depends on the friction of the system. A glass
bottle offers little friction to the vibrating air and would have a very narrow absorption band. Adding
a bit of gauze across the mouth of the bottle or stuffing a wisp of cotton into the neck, the amplitude of
vibration is reduced and the width of the absorption band is increased. For maximum effectiveness,
Helmholtz absorbers should be placed in areas of high modal sound pressure for the tuned frequency...


The sound impinging on a Helmholtz resonator that is not absorbed is reradiated. As the sound is
reradiated from the resonator opening, it tends to be radiated in a hemisphere. This means that unabsorbed energy is diffused, and diffusion of sound is very desirable in a studio or listening room...»

P.214 Master handbook of acoustics by Everest, Frederick Alton Pohlmann, Ken C.

Save for the difference active acoustic controls could make with a grid of Helmholtz resonators, located in a specific way and tuned in a specific way for the speakers/room versus the necessary and usual passive material treatment ...

 Save for that, my greatest discovery in acoustic is, in the 2 cases, passive material treatment and active controls, the ratio between diffusion and absorption.... This is the KEY....Then to my 40 Helmholtz resonatorsgrid, ( my mechanical equalizer) i added 6 Helmholtz diffusers in the last 2 months...

This ratio of absorption/diffusion, with the rightful use of timing and reverberation time, is the more important cause of my actual very high S.Q. for the price paid....

The cause is NOT primarily my successful choices of electronical gear as good they were well chosen....It is the opposite experience which is all over the audio threads where miracles comes always or mostly from costly upgrades of electronical pieces...





Acoustic is the sleeping princess, all electronical pieces are only the 7 working dwarves....

Hey Miracle Workers, I got a big 1 pound bag of shungite rocks (cost $15).  I have been placing them on my amps, cables and such.  I do hear a difference, whether that difference is positive I am unsure.  It does lift the treble significantly.   Lifted treble though can be a sign of increase EMI though, so I am not sure of it so far.  

Has anyone tried Elite Shungite vs the regular?  Looks like it might be just more compacted/compressed shungite. Being more compressed might hold forms better and polish better. Also since it is compressed more it has 'more' fullerenes as it simply has more mass. So the elite might not be worth the 4x cost it typically has. 

Since it is not a crystal, whether it is in powder form or solid pieces, is there a difference in its effect?  I would suspect that shape/size of particle might be much less influential in its effects.

Also, I think its important to remember that shungite is essentially coal from another source. Instead of coming from prehistoric plants and animals that have liquified and transformed, shungite comes from another unknown source that is much older, perhaps extraterrestrial. And because if its age (billions of years vs 300 million years), might have absorbed or transformed into more fullerenes than regular coal has had the time to do.  But regular coal might actually the same effects as shungite.

@mahgister 

So basically.

YOU used lots of tweaks on the headphone....but what about the headphone engineer who made it??

how come they did NOT tweak with your mods??

seems a little bit fishy. how is that possible???

 

- viper

Miracle audio improvement: There are several YouTube testimonies that hearing acuity is greatly improved with the use of psychedelics. 

 

@geoffkait @mahgister 

Any conductive flat surface will act as an RFI/EMI barrier. Placing shungite on or around a Schumann Resonator (which just produces dither, not new science or magic) is akin to placing pieces of aluminum foil around a TV antenna to achieve different results. Any ham radio operator can confirm that placing pieces of tinfoil around any radio frequency device will have an effect on its performance. You could probably have the same effect* by using any conductive material.

*DISCLAIMER. Halz has not tried SG's in the listening room and doesn't have an opinion, but may buy a few for kicks. Offer void where prohibited. Discontinue use of reading Halz' comments if irritation or redness results.