Comments on: Subwoofer Origami

By: GERRIT GOVAERTS

GERRIT GOVAERTS — Mon, 28 Jun 2021 19:20:26 +0000

An H-frame wich is much wider than the diameter of the woofer (say twice) must have a dipole distance D much higher than its total depth . Logic dictates this as other wise an I-frame would have a D equal to the thickness of the baffle

By: John Reekie

John Reekie — Tue, 30 Apr 2019 16:47:18 +0000

Hi, the nulls are roughly to the sides in all cases with the listener “underneath” the diagram. I think your suggestion will have a small effect on the bass response but only small.

By: Randy

Randy — Fri, 19 Apr 2019 17:16:17 +0000

Hi. Thanks for this article.

I was wondering if you knew the effects on the N-frame subwoofer if one were to lengthen one of the sides of the subwoofer to the rear. In your diagram, I would be referring to the upper left side. I was thinking that while the front and rear won’t be totally symmetrical, the added ‘wing’ might take advantage of some of the ‘dead’ space behind the speaker and cut down a bit more on the open baffle cancellation without providing quite the resonance of a U frame in the rear. Also, what is the radiation pattern of the N frame? Is it from the ‘mouth’ of the ‘N’ or is it along the plane of the driver? I hope these questions make sense. Thanks

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By: John Reekie

John Reekie — Sat, 06 Jan 2018 11:35:40 +0000

Hi Anshari, you would have to build a prototype and measure it, but I would use a W-frame, and try some “slot-loading” depending on the driver’s Fs and Q.

By: Anshari Anno

Anshari Anno — Thu, 02 Nov 2017 04:26:39 +0000

Hi John,

Can you advise which design will be the best option for dual 21″ subwoofer with xo point less than 80Hz 24dB?

Thanks

By: John Reekie

John Reekie — Mon, 04 Nov 2013 09:23:47 +0000

Hi Johnson, would you be able to provide a link to those measurements? Thank you!

By: Johnson

Johnson — Sun, 03 Nov 2013 00:52:04 +0000

Published measurements for Ripoles show significantly different data at low SPL vs. high SPL. An equation for minimum W-W separation based upon woofer construction is necessary. .

By: Lucian

Lucian — Tue, 05 Feb 2013 11:13:31 +0000

thank you for your very contentfull and easy to understand explications. It was the missing link i needed to build my best subwoofers. Ripol rules .

Lucian

By: Sean

Sean — Mon, 04 Feb 2013 15:13:01 +0000

Thanks for this article John. This is really helpful to us DIY types. Photos of industry examples next to the diagrams would a useful addition.