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audioaction 27th March 2006 03:36 AM

Not sure how to make a front/back loaded horn work ?
Here’s the situation. I've built a pair of back loaded cabinets for the Fostex 206E according to the recommended Fostex design After many hours in the shop pouring my blood sweet and tears into getting the internal foldings right I've possibly completed the worlds most boring box with a square hole in the front. Anyways I've seen designs like the beauhorn would like to try to attempt to add a mid front horn to the existing Fostex design. I've almost no experience in designing horns, so my question is what do I need to take into consideration when designing a front horn for a speaker that is all ready mounted in a back loaded horn? I've done some searching, but can't quite find what I'm looking for.

Taperwood 27th March 2006 03:55 AM

Define boring.

Is it the sound or the looks, or both, or something else?

audioaction 27th March 2006 04:01 AM

Well I haven't recieved the drivers in the mail, and can't quit starring at these giant shoeboxes I've made. I like sound of mid horns alot, so I thought it would be ineresting to go ahead and incorporate one into the existing cabinets. I guess it boils down to that I don't want to be stuck with your run of the mill back loaded horn speaker ( even though thats what I intended to do in the first place.)

Taperwood 27th March 2006 04:25 AM

I see;) I guess my advice is for patience. Get the drivers and listen to them for a couple of weeks. Then decide if you like them or not.

I'm sure someone then can help you design a horn, if that's what you really want, but I would suggest a prototype or mockup on your first efforts, just to see what's what.


wixy 27th March 2006 08:41 AM

Im interested to know, just how do people come up with a back/front loaded horn design?

big_kahunah 27th March 2006 01:31 PM

audioaction 27th March 2006 02:11 PM

I've already seen on Martin King's site that he will be coming out with a section on a combined front/back type horn. But I was wondering if there is anything else out there, or is there anyone who's tried this before. I know roughly how to design a horn, but I'm wondering what parameters will be affected when combining the two ?

ghpicard 27th March 2006 08:33 PM

Basically, when you have a bass BLH, you reinforce the drivers uptilted frequency response, balancing it if the design is right.
If you add a front horn, you unbalance it again, as you reinforce the mids. The highs are kept as they were before due to the beaming characteristic of the driver.

OTOH, I have a couple of FE108EZ in Fostex recommended FE108Z BLH side firing horns, and added a small conical horn to compensate for a dip around 1000Hz. No measurements, no nothing. Just ear adjustment and a little googling around. And I did my FH from cardboard. It works fine, but I did this after about around 100 hours listening. If in the future I decide the sound became unbalanced (or my ears do) I can always take the contraptions out of the front baffle, and that's it.

I would add to reinforce Doug's advice for patience that driver break-in for Fostexes is quite long. Hundreds of hours for the ESigmas...


alejo 28th March 2006 01:07 PM

Hello Gaston, please if you want contact me to talk about F108eZ I build tube amps and want build one BLH, but I never lisent one.


e-side 1st April 2006 06:59 PM


Originally posted by audioaction
I know roughly how to design a horn, but I'm wondering what parameters will be affected when combining the two ?
You should read Dinsdale's article, he describes a design consisting of one driver, both sides attached to a horn. see bottom of the page.

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