Spiral horn or TL?

Ang · 7th May 2007, 04:06 AM

A straight quarter wave pvc pipe for this woofer would be about 8' long. I'm wondering if a spiral horn would be a way to maintain the low frequency response in significantly less space, or if it will muddy a low distortion woofer (usher 8945).

Here are the specs:
Fs=35Hz
Qts=.309
Qes=.366
Qms=1.9
Vas=34L

Mids and tweeter are OB, just using the usher to ~2K Hz. Has anyone tried a spiral horn in a similar situation?
Thanks

Nanook · 7th May 2007, 04:30 AM

Like a Horn or the BR design from japan, using an increasing horn within the port?

Ang · 7th May 2007, 04:41 AM

yes - that's the one

http://www3.ocn.ne.jp/~hanbei/eng-rear.html

Although I was wondering... could you essentially reverse the design to put a TL taper in a pipe? Different question though.

Pit Hinder · 9th May 2007, 08:01 AM

Ang,

just get yourself MJKs worksheets or AJHorn (preferably both) and start playing. Since progs like these have become affordable the impossible has got into reach. The only drawback with these spiral contraptions IMO: they will more or less behave like an unfolded pipe, as you don't have 90° or 180° bends to attenuate unwanted midrange smut.

Just my 2c
Pit

Ang · 9th May 2007, 11:49 AM

Hi Pit,

Thanks - didn't know the bends were actually useful for something. Am getting the MJK sheets and will post how well they fit.

7th May 2007, 04:06 AM	#1
Ang diyAudio Member Join Date: Feb 2006 Location: Pittsburgh	Spiral horn or TL? A straight quarter wave pvc pipe for this woofer would be about 8' long. I'm wondering if a spiral horn would be a way to maintain the low frequency response in significantly less space, or if it will muddy a low distortion woofer (usher 8945). Here are the specs: Fs=35Hz Qts=.309 Qes=.366 Qms=1.9 Vas=34L Mids and tweeter are OB, just using the usher to ~2K Hz. Has anyone tried a spiral horn in a similar situation? Thanks

7th May 2007, 04:30 AM	#2
Nanook diyAudio Member Join Date: Feb 2004 Location: Chinook Country.Alberta	what spiral horn? Like a Horn or the BR design from japan, using an increasing horn within the port? __________________ stew ☮ -"A sane man in an insane world appears insane."

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7th May 2007, 04:41 AM	#3
Ang diyAudio Member Join Date: Feb 2006 Location: Pittsburgh	yes - that's the one http://www3.ocn.ne.jp/~hanbei/eng-rear.html Although I was wondering... could you essentially reverse the design to put a TL taper in a pipe? Different question though.

9th May 2007, 08:01 AM	#4
Pit Hinder diyAudio Member Join Date: Nov 2006 Location: Hannover, Germany	Ang, just get yourself MJKs worksheets or AJHorn (preferably both) and start playing. Since progs like these have become affordable the impossible has got into reach. The only drawback with these spiral contraptions IMO: they will more or less behave like an unfolded pipe, as you don't have 90° or 180° bends to attenuate unwanted midrange smut. Just my 2c Pit

9th May 2007, 11:49 AM	#5
Ang diyAudio Member Join Date: Feb 2006 Location: Pittsburgh	Hi Pit, Thanks - didn't know the bends were actually useful for something. Am getting the MJK sheets and will post how well they fit.

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