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DannyD303 11th October 2012 03:34 PM

Scaling Down
Want to scale box plans from a 15" to a 10 inch.. my thought process is...

15/10 = 1.5--> 1.5^-1 = .6667

(Random Numbers)
48x24x12 --> 32x16x8

Any thoughts?

Cal Weldon 11th October 2012 03:49 PM


Originally Posted by DannyD303 (
Any thoughts?

Yup. It doesn't work that way. Box volume is determined by a set of parameters know as Theil/Small. It may sound strange but you can have a 10" woofer, that for optimum performance, requires a larger volume than a 15".

Nope, not kidding. :)

DannyD303 11th October 2012 04:25 PM

Yeah I know about those but I was just hopeing it would be that easy. I just havent been able to find paramaters for folded howns or TL boxes. I know that the horn should get bigger at the mouth but should it be 20"s big or 100"s? And should it go from 20 to 100 in 3 bends or 20?


DannyD303 11th October 2012 05:54 PM


folded howns
folded horns*

Cal Weldon 12th October 2012 08:56 PM

Wow, where to start? Maybe tell us more so we can help you more. Pics and numbers would help.

DannyD303 15th October 2012 10:54 AM

DECWARE Imperial Folded Horn

I thinking about scaling down for a 10" subwoofers

Cal Weldon 15th October 2012 01:43 PM

Which one and why are you not starting from scratch? Or is that what you mean by scaling back. If you are looking for a back loaded horn, my first thought would be to hire Scottmoose to design you a box. Keep in mind you might be best off using a Tapped Horn, not either of the ones you have shown. TH's are the best bang for the buck in today's design circles.

DannyD303 15th October 2012 01:51 PM

I've built the housewrecker per spec and its amazing, deep clean bass that fills the house. but I wanted something smaller for my room or even my car, cant fit a 48" speaker in a hatch or my sedan.

And I like TL speakers but as i mentioned, I have no idea where to start. I dont mind paying someone for speaker plans but I'd like to get some outlines on how to design them so I can make some of my own.

Cal Weldon 15th October 2012 01:59 PM

Maybe have a look here.

Simple Tapped Horn Tutorial using Hornresp

chrisb 15th October 2012 07:17 PM

Danny, even with the appropriate math to scale down Steve's big-a$$ Imperial Horn, you wouldn't have the room to fit the

OK, I think this was really just a cheap photoshop prank, but with Steve, one never knows - IIRC this was Bindi - very flexible - although DeVon probably had something to say about the dress code

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