file Folded 1x15 Horn

14 years 6 months ago #1387 by simonr
Folded 1x15 Horn was created by simonr
Protyped the cabinet recently and built a pair. Good response, 134 db 1/2 space from 90 to 200 hz. Size 636x536x700. Uses Celestion 4080fd driver, go on laugh!. Will be producing proper plans shortly. Just one Kicks you in the chest!Two are more than enough for 2x1850 horns loaded with voids and driven with 1000 watts, and 4 1x18 Bass Reflex cabs driven with 2000 watts. Need to get my uploads sorted,with pics and stuff. More Later!.

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14 years 6 months ago #1390 by deadbeat
Replied by deadbeat on topic Folded 1x15 Horn
Don't worry. 4080's I think were used in the USB's original design.

looking forward to see pics, diagrams, plots, etc.

wonder how one would sound with an even meatier driver (SD15? 15.00SW?).

Beranek\'s law
\'bits of ply round a driver\'

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14 years 6 months ago #1392 by simonr
Replied by simonr on topic Folded 1x15 Horn
Hi Deadbeat, cost was the issue and so the celestion was preferable. Will plot the response fo the sd's and see if any improvement, but the celestions are very crisp and tight, sound good and clear even at the upper end.

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14 years 6 months ago #1394 by deadbeat
Replied by deadbeat on topic Folded 1x15 Horn
I'm looking forward to that.

Beranek\'s law
\'bits of ply round a driver\'

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14 years 6 months ago #1397 by simonr
Replied by simonr on topic Folded 1x15 Horn
sd15 gives 1db higher peak at120hz whenplotted in constant directivity window, however flat at about 134.5 dbon axis. xmax is lower though, if you decide to push it.

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14 years 5 months ago #1504 by simonr
Replied by simonr on topic Folded 1x15 Horn
Here are some pics of the cabinet:


Mouth of horn (yes they have been out on the road a few times!)





Access Panel, and note integral handles





Inside the rear chamber





View of throat compression chamber





Rear chamber with driver removed


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14 years 5 months ago #1552 by insane tony
Replied by insane tony on topic Folded 1x15 Horn
Looks great,easy to build?

The chamber looks like its all 90degree angles, is that correct?

Does the throat compression chamber run out and expand as a straight panel or is there an angle further down...can't see from these pics?

Got any plans, even a rough sketch?

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14 years 5 months ago #1763 by simonr
Replied by simonr on topic Folded 1x15 Horn
Hi guys, time to update progress.

Design has moved forward, new version is laterally folded making stacking side by side easier and more effective. Throat chamber revised, as a slot rather than half moon, and to answer one question, there is only the single layer of ply forming the throat and external sloped side to the the horn. No added extras inside apart from the rear chamber. Nice and simple!. As soon as revised version is built and tested, then plans available.

Hornresp parameters will follow next post.

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14 years 5 months ago #1771 by simonr
Replied by simonr on topic Folded 1x15 Horn
Sorry, had to stoke the boiler.

Right now where was I?. Oh Driver is ftr154808f not fd.
Fd could be used, about 2.5 db louder!
This horn has really been designed asa pair.
Hornresp Parameters:
S1: 450 S2: 3000 Hyp 90 T 0.7 Half space 600 w (69.28v) into 8
Vrc 25
Lrc 18
Vtc 8000
atc 850
Two fd's in half spaceare 140db85 to 220hz +/- 1db
Two f's in half space are 138 db 90 to 200hz +/- 1db, lifts after 200 on plot
but as we xover at 200 don't notice it too much.

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14 years 4 months ago #3118 by simonr
Replied by simonr on topic Folded 1x15 Horn
Here goes for another set of pictures. Sorry for the delay but I've been away, and sidetracked briefly on some other topics. Some drawings:


Drawing of one pair of horns:





Model for the pair:





Plot for one pair 1w / 1mtr:





Plot at full power:





The driver for this is the FTR-15-4080-FD. I decided this was the route to go to gain absolute maximum effect from the smallest array of cabinets. 2000 watt power handling, and about 140 db spl from just two small boxes. In half space!. Xmax across the usable range is well within specs at full power. Word of caution, at 200 hz things will start to get directional, and you will probably start to see a much higher spl at this frequency directly out front. Each cabinet is 248 litres, can be made from less than a sheet of ply, (just less than 3/4), and will weigh 30 odd kilos with the celestion fitted. That is an 1850 sized cabinet producing 140 db. Lowest crossover would be around 65 to 70hz, unless you are indoors. At the moment I'm using the F version which is 600 watts each, and it's still awesomely loud. If a few of you are interested, I'll try to arrange a group buy on this driver. I'll only need four of these on the rig, but I might be persuaded to build a few more. Got to sort out the mid next, and get some plots and drawings up on the other forum. Things are getting interesting as my rig is coming together now. Got to find some decent horns for the top though, might make my own flares for the top end!.


Comments would be appreciated, as always, gentlemen. Until the next visit, happy building!.

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