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Re: Y junctions

Posted by wgeiger on May 13, 2001 at 19:57:52:
Neil,
Q & A as before:
Regards,
Bill
RE: A5: Some HF cancellation at Y junction may be expected for wave lengths <= 0.3 dia. of single leg aperture at Y junction.
Q5: So if the leg aperture is 1", then wavelengths = to .3" would be cancelled to some degree?
A5: Yes!
Q6: How does one go about determining this wavelength equivalency?
A6:
Given
[w]=[c]/[f] â€“ wavelength
[c] â€“ velocity of sound in air
[f] â€“ frequency
and
[w] <= 0.3*[d]
then
[c]/[f] <= 0.3*[d]
and
[f] => [c]/(0.3*[d])
Q7: Have you (or anyone else) ever heard this affect,
A7: Yes. (Should read effect!)
Q8: and what does it sound like?
A8: Sound similar that herd when putting a seashell to your ear.
It is commonly referred to as â€˜colorationâ€™.
Q9: Just a muting at certain frequencies, or?
A9: As frequency increases, more and more frequencies are â€˜mutedâ€™ until all remaining are entirely suppressed. The idea is not to go there.
Q10: One main question I have, is if you have (2) 1" drivers coupled at a Y junction, what should the combined throat size be?
A10: As there are two throats, each is 1â€ in dia.
In the neck, where the diaâ€™s. are larger and bifurcation is terminated, the joined area is twice that of an otherwise equivalent horn used with a single driver. For whatever horn function you are using, as length away from throat increases, so does horn section area.
Q11: I would be interested in learning more or being pointed in the right directions to learn more about how to effectively coupling drivers.
A11: See my post on phase plugs. Have not found a treatise on bifurcation.
For general horn design references, the following are provided:
ASA -B - Acoustical Society of America Book
http://asa.aip.org/publications.html
AES-J - Journal Article (Subject to Peer Review)
http://www.aes.org/journal/search.html
AES-P - Convention Preprint (Not Subject to Peer Review)
http://www.aes.org/publications/preprints/search.html
AES-A - Anthology of Journal Articles
http://www.aes.org/publications/anth.cfm