Comments on: Subwoofer Origami

By: GERRIT GOVAERTS

GERRIT GOVAERTS — Sun, 04 May 2025 17:51:33 +0000

Pls consider this setup : a woofer of size say 10 inch mounted in the center of a round baffle that has a radius of 40 inch (that’s extreme I know) . Now imagine putting that round baffle in an H-frame of lenght 20 inch , essentially a cylindrical tube of length 20 inch and radius 40 inch . If you say that the dipole distance is only 20 inch , the length of the H-frame , then you get the following contradiction : by removing the H-frame , you get an I-frame with dipole distance 40 inch . How on earth can the dipole distance grow , when I remove the H-frame ?

By: andrew

andrew — Mon, 30 Dec 2024 15:45:31 +0000

hello,
could you please give me a few names of bookshelves less than 500 us including older models that are good with heavy metal music. so less distortion and capable of sorting out compressed music and fast drums.

thank you vert much!

By: John Reekie

John Reekie — Fri, 28 Jun 2024 16:46:34 +0000

Not really, you have neglected the path over the top.

By: Aldo Tonello

Aldo Tonello — Thu, 05 Aug 2021 13:20:32 +0000

Hallo John your article is absolutely amazing!
unfortunately I am not able to understand whati is the best configuration for me, can you give me some suggestions?

I have 4 woofer w15 Lii Audio designed for open baffle (you can see the specs here)
and I also have a pair of S10 (Lii Audio) in Liionidas open Baffle.

I want to change to try the S10 in an OB panel like Big Betsy design ( ) the measures are raffly 106X80
and I want to use two woofers for each channel, what do you think could be the best configuration to mach with the S10 Dipole?
Thank you
Aldo

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!