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Bass Horn Idea
Bass Horn Idea
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Old 9th November 2012, 02:46 PM   #21
tb46 is offline tb46  United States
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Join Date: Jan 2006
Location: Texas
Hi 3GGG,

I tried it today with the lastest downloaded version, and it seems to work. Another alternative is to use Hornresp, and its schematic export function.

Just in case you are having problems with the usage of the worksheet, here is my attempt at an English translation of the "Notice":


This worksheet is designed for horns with two walls parallel, the expansion is therefore only in a plane. (One could also call these horns: radial horns). The bass horn by Mr. Roggero is a horn of this type.

An option permits to use a wall of the listening room as a mirror (element of symmetry), this leads to shorter extreme bass enclosures.

To reduce the file size the worksheet has no entries (in the working cells). To enable calculation all items must be in the worksheet "Horn Calculation": copy line 34 from line 35 up to line 4035.

The choice of parameters is made in the sheet "Horn Calculation."

In field B10 select the acoustic bass cutoff frequency, knowing that it is desirable to electrically cut an octave above.

In field B11, enter the throat or motor output diameter in mm.

In B14, we can choose the type of expansion:
- 1 in the case of an exponential,
- 0 for hyperbolic.
- The default value for a horn will be 0.707 (hypex).

In B19, we choose a coefficient that defines the type of horn, round or square:
- 3.14 for a round enclosure, and
- 4 for a square.

In B37, a coefficient can be used if you use the room corners and reflective walls to extend the enclosure:
- 2 if it ignores walls (default case), and
- 1 with the walls.

Choose the settings, let Excel calculate (a few seconds) and view the result on: Half horn profile sheet that draws the profile."


Last edited by tb46; 9th November 2012 at 02:54 PM.
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Old 8th April 2013, 11:54 PM   #22
3GGG is offline 3GGG  Australia
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Join Date: Mar 2010
With my 4 way horns running I now need to look at under 120 HZ. The idea is for a bass horn built like a bulkhead into the ceiling.

It will look imposing so I may consider building the horn firing down the rear wall and exiting at the base of the floor.
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File Type: png Screen Shot 2013-04-09 at 9.14.50 AM.png (34.9 KB, 256 views)
File Type: png Screen Shot 2013-04-09 at 9.14.34 AM.png (39.6 KB, 241 views)
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Old 9th April 2013, 12:08 AM   #23
3GGG is offline 3GGG  Australia
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Join Date: Mar 2010
With a low 2400mm ceiling this doesn't give a long horn enough horn length with 500mm for the driver and an exit of 500mm at the base.
Maybe a fold at the bottom? back to sketch up
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File Type: png Screen Shot 2013-04-09 at 9.36.53 AM.png (42.2 KB, 241 views)
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Old 10th April 2013, 01:09 PM   #24
epa is offline epa  Netherlands
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Join Date: Apr 2010
Location: amsterdam
starting with more area(bigger driver/s)the horn can be shorter.
i like the bulkhead idea,if you need a longer path start in de center then fold around the corner and proceed like in post 22.
one good thing about music ,when it hit you feel no pain.
so hit me with music
. hr driver db
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Old 25th August 2013, 10:28 AM   #25
Rewind is offline Rewind  Sweden
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Join Date: Jan 2009
Location: Oslo
Any luck on this project? I am thinking, why not build a really huge one on the lawn in the backside of the house, and whenever I need some bass I can just open the backdoor. I could have a small indoor spare sub when quality bass is less important.

Last edited by Rewind; 25th August 2013 at 10:35 AM.
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Old 25th August 2013, 11:29 AM   #26
3GGG is offline 3GGG  Australia
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Join Date: Mar 2010
I have made some progress. Footing have been dug and poured, lintels installed on both the exterior and interior stud walls and block work has begun.
Fc 16Hz, 18TBX100 drivers will be used.
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File Type: png 16Hz.png (29.4 KB, 178 views)
File Type: png bass behind.png (29.6 KB, 173 views)
File Type: jpg bass1.JPG (594.1 KB, 125 views)
File Type: jpg basshorn.JPG (777.7 KB, 129 views)
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