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Old 21st February 2008, 05:50 PM   #1
Tyimo is offline Tyimo  Hungary
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Default Horn mouth venting to the floor

Hi!
How could we calculate-model-simulate a BLH, where the mouth is located (opened) to the floor??
I know in this situation the floor and the side wall and back wall, these junctions become part of the mouth, but I don't know how big is this influence for the "classic" way calculated horn lenght and size.
How could I calculate such a horn with MJK's program?

Greets:

Tyimo
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Old 21st February 2008, 09:58 PM   #2
jnb is offline jnb  Australia
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If it were sitting on a floor with no nearby walls, it would be radiating into half-space. This can be calulated in Hornresp, not sure about MJKs sheets.
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Old 21st February 2008, 10:03 PM   #3
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Remember though, if it is firing straight at the floor, you will run in to reflected waves running back up the horn. NOT GOOD. This will cause smear and cancellation like you have never thought possible. Firing at the floor seems like it won't be a good idea, period. Why would you want to fire at the floor anyway? Just curious.

Tom
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Old 21st February 2008, 10:21 PM   #4
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Check Bruce Edgars Seismic Horn sub at 6moons.com: 6moons

Click the image to open in full size.
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Old 21st February 2008, 11:11 PM   #5
ronc is offline ronc  United States
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With the internal deflector in place its not firing at the floor but produces a 360 degree radiation pattern.

ron
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Old 22nd February 2008, 05:17 AM   #6
Tyimo is offline Tyimo  Hungary
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Quote:
Remember though, if it is firing straight at the floor, you will run in to reflected waves running back up the horn. NOT GOOD. This will cause smear and cancellation like you have never thought possible. Firing at the floor seems like it won't be a good idea, period. Why would you want to fire at the floor anyway? Just curious.
Tom!
Yes, theoretically you "could" have true, but in the reality it works very well! Listen to the Impulse loudspeakers!

Ron has true: with (and without!) the internal deflector in place its not firing at the floor but produces a 360 degree radiation pattern. You could imagine like the hornmouth is located near the floor and opened along the 4 sides of the cabinet.

I wouldn't like to open a discourse about why is it good or not, rather I would like to concentrate for the calculating-modeling solutions.

Tyimo
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Old 22nd February 2008, 06:59 AM   #7
Tyimo is offline Tyimo  Hungary
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The bottom-firing horn, a technique elegantly deployed by among others Dr. Bruce Edgar in his "Monolith Horn". This is potentially a very effective approach, in that it wraps the mouth around two or more sides of the cabinet. For the bottom-firing horn, we can easily obtain a very large mouth opening by wrapping the mouth around four sides (both sides and front and rear), and mounting the horn on stands of appropriate height. We'd need stands of just enough cm height to obtain the same mouth area.

Greets:

Tyimo
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Old 22nd February 2008, 06:31 PM   #8
Tyimo is offline Tyimo  Hungary
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Dave?!?
Scott?!?
Martin?!?
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Old 22nd February 2008, 06:53 PM   #9
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I'd just model it in MJKs BLH Sections sheet or hornresp as best you can. Job's a good 'un (or as close as you're likely to get).
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