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-   -   front load W horn??? (http://www.diyaudio.com/forums/multi-way/45070-front-load-w-horn.html)

psychosteve 5th November 2004 12:54 PM

front load W horn???
 
is a front loaded W horn suitable for an eminence beta15?

if so does any one know where i can get plans for a front loaded W horn? i know they where published in the Fane spkr book, but i cant find one anywhere.

plus help on tunning it would be apreciated. cheers guys, steve.. ..

Brett 5th November 2004 01:38 PM

What's the application for the horn? And over what frequency range?

psychosteve 5th November 2004 01:48 PM

centre bass bin for PA system,

usable freq. of speaker is 35hz to 4khz resonance at 35hz

so i can pick it anywhere from 30hz to 8khz on active cross over, probly low pass its upper limit at 3khz coz thats where the tops take over

power 350watt but only running at 300watt

how does that sound? is it any good? will it work? cheers for the help, steve.. ..

OMNIFEX 5th November 2004 02:18 PM

Eminence Beta 15 in a horn = :dead:


Can't you get something else?


How about Precision Devices PD 158 :nod:


Rock On ! :eguitar:

Tim Moorman 5th November 2004 03:10 PM

That is a lot of bandwidth for any horn, whatever the type - for any driver, really. Highly doubtful.

Bill Fitzmaurice has a new design that might get closer to your target than other types:

http://www.billfitzmaurice.com/

Roger Mogale used to have a site on your side of the pond for his Big Mouth speakers. Can't find it, now, but pro sound guys probably know about him.

Tim

Brett 5th November 2004 03:13 PM

Quote:

Originally posted by psychosteve
centre bass bin for PA system,

usable freq. of speaker is 35hz to 4khz resonance at 35hz

Not in a W bin it won't be.
Quote:

so i can pick it anywhere from 30hz to 8khz on active cross over, probly low pass its upper limit at 3khz coz thats where the tops take over
35 genuineHz from a horn in halfspace is no mean feat, and you'll not likely get within a decade of 4.5kHz. Every commercial W bin design I've ever seen is too short, and has way too small a mouth to support anything like 35Hz. The top end will be seriously attenuated by the 180 degree folds in the horn and 400-500Hz will likely be the upper limit in any decently designed W, with any driver. It's best to design a horn with the intention of getting about a decade of response out of it.
Quote:

power 350watt but only running at 300watt

how does that sound? is it any good? will it work? cheers for the help, steve.. ..

Bad. No. No.

I just looked at the B15 datasheet again. Not really suitable for a horn. It's EBP is too low, it has a gutless motor and I'm not sure if the cone is specced correctly for the loads it will endure at high power in a horn. We have some in the workshop (I think) and I'll look tomorrow, but I'd say it's a scratching. The PD drivers are a great idea, but not cheap.

Best DIY-able LF basshorn is the LAB, but I wouldn't use it above 100Hz or so. And it's a bee-atch to build.

Bill Fitzmaurice has a design called the Tuba30 that might do the job for you. Not built it, but I have the plans and will get around to it soon.

Edit: Tim Moorman added Bill's URL.

Rog Mogale's site is here and there are some interesting designs on Jeff Robinson's site too.

Horn design is not a simple cut-and-paste like most domestic ported boxes are, for example.

Hornlover 5th November 2004 03:59 PM

I have plans for a W horn. Its low freq. cutoff is 50Hz, and its 40" wide X 80 inches long. Upper limit is about 400Hz. I agree with the others that the Beta isnt the best driver for a horn, but I guess you could try it.

Brett 6th November 2004 02:14 PM

Looked at the B15 in the shed, and my considered opinion is, no.

psychosteve 6th November 2004 09:37 PM

ah well it was worth an ask, i already had the driver and was looking at some extra punch for low and mid, in a not tall box,

i just remembered the fane W horns that some rock star stood on at the front of a gig somewhere.

what are your thoughts on a wide trapezoidal thats 19 inches high? possibly the same front profile as a horizontal W horn but plain ported trap. box?

Brett 7th November 2004 01:13 AM

Quote:

Originally posted by psychosteve
ah well it was worth an ask, i already had the driver and was looking at some extra punch for low and mid, in a not tall box,

i just remembered the fane W horns that some rock star stood on at the front of a gig somewhere.

"Punch" is usually at 60-100Hz
Quote:

what are your thoughts on a wide trapezoidal thats 19 inches high? possibly the same front profile as a horizontal W horn but plain ported trap. box?
Could be done. I haven't run the numbers in a sim as I don't have the software here, but with that box height it would be a tight fit based on the driver size. Box shape is generally irrelevant for PA stuff, except for how it physically fits with the rest of your rig, stage or stack area it consumes and how easy it is to move around, get through doorways and pack, stack and load in the truck.


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