Izbor difuzora i konstrukcija

[NLP]

Originally Posted by boggy

NLP, koliko shvatam analog pita za razlike izmedju dve vrste 2D difuzora, a ne izmedju 1D i 2D.

Ovo za manju udaljenost nisam znao do sada, ako imas neki papir o tome bilo bi mi jako korisno

analog, i aluminijum i MDF i drvo su akusticki materijali koji mogu da rezoniraju (svako na svoj nacin)... ne vidim zasto bi jedan bio bolji od drugog u kvalitativnom smislu... stavi ono sto ti je lakse da napravis.

pozdrav

bogi

Aha, pa to je stvar preferencije ako ima stvarno mnogo različitih segmenata slično kao Skyline može i QRD da bude dosta kvalitetan.

Za difuzor nek bi bilo da razvije optimalno difuziono polje:
343m/s:500Hz (koliko nizko još difuzor difuzira ali to je tako tako jer nema naglog cut off-a jer djeluje još kakvu oktavu niže) = cca. 0,7 X 3 = cca. 2m.
Kao što je rekao u biti analog.

Da 2D treba nešto manje prostora da razvije difuziono polje sam mislio na Skyline jer nema separatora, nisam bio dovoljno specifičan.

E sad ne znam da li sam to zasledio u "RPG" (DAntonio&Cox) knjizi ili u debatama

na brzaka, ne baš direktno:
http://www.rpginc.com/products/hemiffusor/index.htm
Solution
The Hemiffusor™ is the first and most affordable 2D QRD?.It offers twice the reflection attenuation of the 1D QRD?, because it uniformly scatters sound into a hemisphere. The Hemiffusor™ provides uniform, omnidirectional, broad bandwidth diffusion in an attractive ceiling or wall design element.

pa još to (nema veze sa distancom od difuzora):
http://www.rpginc.com/products/omniffusor/index.htm
Absorption
It was discovered that phase gratings, consisting of wells of different depths separated by dividers, also may provide sound absorption. The absorption is caused by viscous losses created by high particle velocity flows over the dividers, between wells of different depths and resonant frequencies. The absorption can be enhanced by placing a resistive element, e.g. fabric, near the face of the phase grating. A supplemental sound absorption data sheet illustrates the absorption performance uncovered, with fabric directly on the surface and at 2" and 7" above the surface.