Horn

[bjackson1]

I am interested in making a horn loaded subwoofer specifically for DJ use tuned to around 30-40hz and I was wondering how to design one since LspCAD doesn't have that option, and I can't find much on the internet in the way of a free program to help. Any thoughts?

 

[mike.e]

1. Find a pre existing design
2. Study for ages,ask questions and eventually design something with some one helping you making sure you dont make scrap plywood.

Id REALLY reccomend 1. There are clones of the WSX or SL36,either would do.I can post links to those.

Now il ask some questions
-Boundarys? wall loaded?
-Box number?
-SPL or extension preferred?

www.speakerplans.com

http://roborg.freefronthost.com/infra-horn.htm

http://www.diyaudio.com/wiki/index.php?page=basshorn
www.volvotreter.de 'downloads'

http://forums.klipsch.com/idealbb/view.asp?topicID=65662&sessionID={B1B0603B-D364-416A-AD62-0255BEAD87FB}

 

[bjackson]

Thanks for the reply. SPL is prefered over extension becuase this is for a mobile DJ.

One box would probably be better than two, but I could talk to him and see how he'd feel about two.

Thanks for the plans, do you/anyone have a suggestion for around 300-400 in parts (excluding wood, screws, etc, and even x-over possibly).

 

[mike.e]

Three main choices
1850
WSX
T36

All requiring an 18" driver. With only 2 enclosures,a bandpass box maybe easier to build while less bulky,quality would be worse.

http://www.speakerplans.com/index.php?id=1850horn

http://www.iven.nl/kastontwerpen/kastontwerpenpdf/martin wsx.pdf

http://www.iven.nl/kastontwerpen/kastontwerpenpdf/cerwin Vega B36.pdf

Youl require active filtering + amplification in the order of 400w-1200w RMS

Ive listened to two WSX horns in a small club and am entirely happy with them,but I havent heard any other basshorns.

More options.
http://www.iven.nl/kastontwerpen/kastontwerpen.htm

Lastly,if your REALLY short on cash two tempest horns could be a way to go,cheap driver and decent kick. I cant say how well they work in reality however,they seem to be based on the CV design.

 

[boydon_lepasci]

This would probably be the smallest design that meets your stated requirements and you could build 2 with the budget listed. Look around at the other designs on the site too.

http://www.billfitzmaurice.com/plan..._id/5?osCsid=f45317ea41ad977863bf98268a6aba0f

 

[mike.e]

Problem,see how small they are- must be a compromise in either F3 or sensitivity.

 

[bjackson]

That was my feeling too, I really don't like the idea of using an 8" driver as a subwoofer.

The Tuba 36 looks promising though...

 

[mike.e]

His approach is different to many. Rather than have a high F3 and flat response,he goes for a small mouth with a long path and achieves a stepped response,which may or may not be useful to you.

I would suggest a higher F3 with more sensitivity for DJ usage.

 

[bassmanbob]

vh-35 specs 15''

Here's a Cerwin Vega design, vh35, pre sl36. pre el36

 

[moray james]

Consider a TAP...

William's 60 Hz TAP Horn will give you flat response to 50 Hz with a 10 inch driver in a very compact box that is as simple as it gets to build. With room gain and a little EQ you should be able to squeeze a little more bass extension and be off to the races. Bonus it runs flat up to 260 Hz.

http://diy.cowanaudio.com/index.html

 

[djk]

| 35 Hz Tapped Horn

Def_Const |Horn Dimensions

{
a1 = 500e-4; |Area at throat (cm^2)
a2 = 881e-4; |Area at rear of driver (cm^2)
a3 = 3100e-4; |Area at front of driver (cm^2)
a4 = 3200e-4; |Area at mouth (cm^2)
l1 = 20e-2; |Distance from throat to rear of driver (cm)
l2 = 250e-2; |Line distance from rear of driver to front of driver (cm)
l3 = 10e-2; |Distance from front of driver to mouth (cm)
}

Def_Driver 'Dr1'

| Eminence Kilomax Pro15A

Sd=856.3cm2
fs=41Hz
Qes=0.40
Qms=8.80
Vas=155L
Re=4.97ohm
Le=1.78mH

system 'S1'

Driver Def='Dr1' Node=1=0=3=4
Waveguide 'W1' Node=2=3 STh={a1} SMo={a2} Len={l1} Conical
Waveguide 'W2' Node=3=4 STh={a2} SMo={a3} Len={l2} Conical
Horn 'H1' Node=4 STh={a3} SMo={a4} Len={l3} Conical

 

[djk]

"The Tuba 36 looks promising though..."

Here is what one of the BF Tuba's actually does:

The cyclical peaks and dips are from too small of a mouth. If you used eight of so in a stack it would smooth out quite a bit.

Here is what four Eminence can do in a tapped horn design:

Each box ends up about 36x36x24W

 

[djk]

This is what we're trying to achive:

An externally hosted image should be here but it was not working when we last tested it.

http://www.danleysoundlabs.com/pdf/Danley TH-115 Spec Sheet_r2.pdf

How close is the Eminence design to the Danley?

If we have the enclosure design close, the impedance peaks should be at very similar frequencies:

 

[djk]

One last design, a very small box for a single 12" designed for maximum output in minimum space. Dance music has peak demands in it's program around 55hz (ref EAW), this box was designed to have a ton of output in that region.