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Old 13th March 2014, 12:25 PM   #1
Tyimo is offline Tyimo  Hungary
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Default How to design a waveguide for bass speaker?

Hi!

Could somebody tell me?

Greets:
Tyimo
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Old 13th March 2014, 04:33 PM   #2
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Because of the long wavelengths of bass (40 Hz around 28 feet, 8.7 meters long) a bass waveguide would need to be huge.

More practical are cardioid or end fire arrays, but they don't work well in acoustically small rooms, that is rooms with dimensions much shorter than the wavelengths to be guided.
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Old 13th March 2014, 04:33 PM   #3
tvrgeek is offline tvrgeek  United States
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First, go buy a few acres.

OK, An old issue of Speaker Builder had quite a bit on bass horns. Full or folded at various times. You might look at Klienhorn for understanding bass and horns. There are several programs out there that will do the simulation. The throat and back loading are what I understand to be the biggest problem, besides pure size.

Are you looking to do a PA speaker? Physical dimensions pretty much limit them in home use. Can you say what this project is trying to achieve?
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Old 13th March 2014, 07:43 PM   #4
tinitus is offline tinitus  Europe
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depends on what you expect of it ?

in my book a waveguide on a bass is more like a midbass/low midrange helper
and it might help to phase allign a woofer with mid/tweeter horn
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Old 14th March 2014, 03:07 AM   #5
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Quote:
Originally Posted by Tyimo View Post
Hi!

Could somebody tell me?

Greets:
Tyimo
Great question.
I did my first horn for a 12" H/H (UK) PA driver, in the 80's without software or any knowledge and it worked (call it prediction), and it's very operational after all this years.
I guess you have to start somewhere:
1. You are not Tom Danley
2. You need a driver
3. You have about S space for the mouth surface of the horn and X length for the horn flare, available ().
Horn loudspeaker - Wikipedia, the free encyclopedia
Horn / Waveguide Contour Comparisons
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Old 14th March 2014, 05:49 AM   #6
Tyimo is offline Tyimo  Hungary
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Hi!
Thanks for the responses!
I know how horns are working. I built some already.

Quote:
in my book a waveguide on a bass is more like a midbass/low midrange helper and it might help to phase allign a woofer with mid/tweeter horn
Yes, I also think about waveguide as a helper and not a real horn. So, I think the classical horn calculation and theories are not 100% compatible.
Somewhere I read the the waveguide could be smaller, shorter than a normal horn. It is therefore not as efficient as a true horn but in return you'll have a bass free of colourations and a lot less room boundairy problems. It can help to the soundwaves to easily detach from the loudspeaker and fill the room with sound.
So my questions:
- Is a waveguide equal to a horn???
- if they are not equal:How to calculate the waveguide's throat, mouth, lenght and flare?
- How much efficient compared to a real horn?

greets:
Tyimo
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Old 14th March 2014, 07:30 AM   #7
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Hornresponse should easily calculate your waveguide. Are you familiar with the program.
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Old 15th March 2014, 06:45 AM   #8
Tyimo is offline Tyimo  Hungary
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Hi!
Yes, but how to begin with waveguide? See my questions!

greets:
Tyimo
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Old 15th March 2014, 09:53 AM   #9
Juhazi is offline Juhazi  Finland
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Hornresp for Dum... hmm... Everyone - Home Theater Forum and Systems - HomeTheaterShack.com


Hornresp
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Old 15th March 2014, 10:13 AM   #10
sreten is offline sreten  United Kingdom
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Hi,

A waveguide on a bass speaker will not affect the bass
unless its huge. Your just manipulating midrange and
there is is not a lot to be gained compared to the size
penalty of the front baffle required fpr a waveguide.

Waveguides work on tweeters because they
end up about the same size as the lower units.

rgds, sreten.
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