How to design folds in rear loaded bass horn - diyAudio
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Old 18th August 2007, 06:59 PM   #1
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Join Date: Jul 2007
Default How to design folds in rear loaded bass horn

Hi
I am interested in rear loaded horn design…. I purchased AJ horn
and was able to successfully design one.
But the problem in how do u fold the horn into a more wife friendly form.
This is the area I need help in.
I have the contour list from aj horn and horn specs.
Pleas help...
Contour list..
0.0000 100.00 5.00 5.64
0.0200 114.00 5.70 6.02
0.0400 128.00 6.40 6.38
0.0600 142.00 7.10 6.72
0.0800 156.00 7.80 7.05
0.1000 170.00 8.50 7.36
0.1200 184.00 9.20 7.65
0.1400 198.00 9.90 7.94
0.1600 212.00 10.60 8.21
0.1800 226.00 11.30 8.48
0.2000 240.00 12.00 8.74
0.2200 254.00 12.70 8.99
0.2400 268.00 13.40 9.24
0.2600 282.00 14.10 9.47
0.2800 296.00 14.80 9.71
0.3000 310.00 15.50 9.93
0.3200 324.00 16.20 10.16
0.3400 338.00 16.90 10.37
0.3600 352.00 17.60 10.59
0.3800 366.00 18.30 10.79
0.4000 380.00 19.00 11.00
0.4200 394.00 19.70 11.20
0.4400 408.00 20.40 11.40
0.4600 422.00 21.10 11.59
0.4800 436.00 21.80 11.78
0.5000 450.00 22.50 11.97
0.5200 464.00 23.20 12.15
0.5400 478.00 23.90 12.33
0.5600 492.00 24.60 12.51
0.5800 506.00 25.30 12.69
0.6000 520.00 26.00 12.87
0.6200 534.00 26.70 13.04
0.6400 548.00 27.40 13.21
0.6600 562.00 28.10 13.37
0.6800 576.00 28.80 13.54
0.7000 590.00 29.50 13.70
0.7200 604.00 30.20 13.87
0.7400 618.00 30.90 14.03
0.7600 632.00 31.60 14.18
0.7800 646.00 32.30 14.34
0.8000 660.00 33.00 14.49
0.8200 674.00 33.70 14.65
0.8400 688.00 34.40 14.80
0.8600 702.00 35.10 14.95
0.8800 716.00 35.80 15.10
0.9000 730.00 36.50 15.24
0.9200 744.00 37.20 15.39
0.9400 758.00 37.90 15.53
0.9600 772.00 38.60 15.68
0.9800 786.00 39.30 15.82
1.0000 800.00 40.00 15.96

Aj horn specs...
Horn:
Type = Rearloaded
Contour = Parabolic
Position = Floor
Distance mic -> cone = 1 m
dl = 0 m
h = 40 cm
b = 20 cm
l = 1 m
Drv.pos. = 0 m
At = 100 cm²
Vfc = 5 l
Betha1 = 0
Betha2 = 0
Vrc = 20 l
fbr = 0 Hz
Abr = 0 cm²
ßbr = 0
Vab = 0 l
fab = 200 Hz
Aab = 0 cm²
ßab = 0
Info =
Crossover:
Misc:
Cms = 0.37 mm/N
Mms = 11.037 g
Rms = 0.75 kg/s
BxL = 5.87 N/A
Pe = 1 W
Qts = 1.082
VHorn = 45 l
Vtot = 50 l
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Old 18th August 2007, 10:56 PM   #2
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With a saw and screws and glue?

But seriously, it all depends on what you want to acheive as far as freq response/bandwidth. Any LF horn is going to be very large and require placement in the corners or at a wall floor boundary, unless you build a huge mouth. (best built into a wall actually)

The HF extension will depend on (among other things) the smoothness of the transitions from one section to the next.

The best being completely smooth and without any sharp changes.

BUT, that doesn't matter much unless you need HF response.

Having said that, there are several "classic" folded horn designs that are spelled out on the web and in books. Pick one if you wish. Scale the dimensions to meet your flare rate and mouth size.

Two interesting ones are "W" horns and "J" scoops, fyi.

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Old 19th August 2007, 12:37 AM   #3
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Thanks for the info...
But i was looking for a rule of thumb for
desiging folded horns, something i could apply
accross the board.
My design has a flair of 40 cm x20 cm and
length fo 1 meter...
Horn flair type Parabolic.....
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Old 26th August 2007, 03:59 PM   #4
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Location: New York State USA
Ummm...

Parabolic?
Hyperbolic or Exponential, no parabolic I know of.

Flare of 40cm x 20cm??
No such thing.

Flare RATE.
Mouth Size

IF the mouth size is 40cm x 20cm, that is far too small for a bass horn.

Suggest you do some searching here and in general on the internet for both horn theory and articles, as well as other "horn calculators".

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