Building a rear-loaded PA horn subwoofer

[BAM]

Can anyone here assist me or refer me to materials that would help me design a rear-loaded PA horn subwoofer? I intend to use two JBL 2226 15" woofers which will be rear-loaded into a folded horn, and I just want to know how long and big I should make the horn and how long to make it, flare rate, etc.

If you could provide me with a site that has equations, I would appreciate it. Horn-modeling software would be even better.

[roddyama]

Hi Bam,

I'm sure you'll be able to find some good information here:
http://invalid.ed.unit.no/~dunker/horns.html

Good Luck,
Rodd Yamas***a

[planet10]

Dinsdale's Classic Horn Articles

Somewhere i have plans for some horns i designed for Celestion 15s (meant to be used 2/side thou ie 4x15")



dave

[navin]

i used to doubt it, Dave but now I am sure you guys are nuts. 4 x 15" what on earth do you need that for?

also i have felt bass from 2 Belle Klipsch (with 2 corner loaded Klipshorns) they dont go so low (maybe 40-45Hz) but it sounds a lot lower as the bass is extremely fast.

[pinkmouse]

Cool boxes Dave, though they look very similar to old (80's) Turbosound subs- great minds think alike?

[MJK]

Equations and software for designing rear loaded horn enclosures can be found on my website.

Good luck,

Martin

www.quarter-wave.com

[planet10]

Originally posted by navin
i used to doubt it, Dave but now I am sure you guys are nuts. 4 x 15" what on earth do you need that for?

each side

4x15 - Bryston 4B -- a channel for each pr (4x400W)
A pr of Audax PR17 in front loaded horns - Bryston 4B each driver (4x200W)
Celestion 800Hz horn - Bryston 3B (2x100W)
A quad of Celestion HF50 - Bryston 3B (2x200W)

This was a rock & roll band PA System. It was not bad. And it did play loud. I always wanted to try 4/side but never got as far as going the Mk IIIs.

BTW the bass bins were designed for 50 Hz when used in pairs -- each cabinet front is 33" x 48" and designed so that even the area where the drivers sit is part of the horn, so a 66"x48" mouth. If we could push the open end up against a wall (ie when on a stage) they acted as wings and gave a little more impact and extension.

dave

[navin]

Bryston for PA use? Why not use PA amps?

[planet10]

Originally posted by navin
Bryston for PA use? Why not use PA amps?

Bryston are PA amps. About 1/2 their sales go into the pro market. They are very reliable. And if they do break, they will get you a module really quick and they are easy to fix (been there, done that). The fact that they sound damn gound is the reason why they are all i would consider (althou i did on occasion use Quad 303 for the top). Most PA amps suck. Brystons don't.

dave

[Brett]

<b>Most PA amps suck</b>

That's up for understatement of the week. I've heard a couple of home-built PA rigs running older Perreaux amps that sounded excellent, and when replaces with standard PA dreck, went all to hell. Quite a dramatic difference.

Cheers