Horn mouth venting to the floor

Tyimo · 21st February 2008, 05:50 PM

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

jnb · 21st February 2008, 09:58 PM

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.

Harderror · 21st February 2008, 10:03 PM

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

Kim Bay Smidt · 21st February 2008, 10:21 PM

Check Bruce Edgars Seismic Horn sub at 6moons.com: 6moons

ronc · 21st February 2008, 11:11 PM

With the internal deflector in place its not firing at the floor but produces a 360 degree radiation pattern.

ron

Tyimo · 22nd February 2008, 05:17 AM

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

Tyimo · 22nd February 2008, 06:59 AM

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

Tyimo · 22nd February 2008, 06:31 PM

Dave?!?
Scott?!?
Martin?!?

Scottmoose · 22nd February 2008, 06:53 PM

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).

21st February 2008, 05:50 PM	#1
Tyimo diyAudio Member Join Date: Nov 2002 Location: Hungary	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

21st February 2008, 10:21 PM	#4
Kim Bay Smidt diyAudio Member Join Date: Nov 2004 Location: Aarhus, Denmark	Check Bruce Edgars Seismic Horn sub at 6moons.com: 6moons __________________ ...there's is a difference between knowing the path and walking the path...

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21st February 2008, 09:58 PM	#2
jnb diyAudio Member Join Date: Dec 2006	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.

21st February 2008, 10:03 PM	#3
Harderror diyAudio Member Join Date: Mar 2006 Location: Washington DC	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

21st February 2008, 11:11 PM	#5
ronc diyAudio Member Join Date: Mar 2003	With the internal deflector in place its not firing at the floor but produces a 360 degree radiation pattern. ron

22nd February 2008, 06:59 AM	#7
Tyimo diyAudio Member Join Date: Nov 2002 Location: Hungary	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

22nd February 2008, 06:31 PM	#8
Tyimo diyAudio Member Join Date: Nov 2002 Location: Hungary	Dave?!? Scott?!? Martin?!?

22nd February 2008, 06:53 PM	#9
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	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).