Open baffle fe127e with BR woofer

aliens exist · 17th July 2009, 08:33 PM

Hi there,

I have a new project of loudspeaker. I was thinking about a fostex 127e, which I have heard a lot of good things as a medium, on an open baffle with a 12" woofer in a closed box or BR.

These will be driven by a gainclone lm3886 and an usb dac (my macbook will be the source with all my albums in Apple lossless). At the beggening it will be passive filter and later I will bought a DCX2496 with a pure class A for the fostex.

Was this kind of loudspeaker done by someone here ?
Is it a good idea ?

Simon.

Telstar · 17th July 2009, 09:16 PM

just a little suggestion: dont mix BR with OB, unless that's just a subwoofer (<80hz). Or the bass will ruin everything.

aliens exist · 18th July 2009, 05:00 PM

Thanks for the reply, but it won't just be a subwoofer, I would like tu cut it approximately near 300Hz.

planet10 · 18th July 2009, 05:12 PM

Have a look for the Martin King passive open baffle thread... much like you want to do, but an OB all the way. Mixing types of box (ie box vrs no box) is not impossible but tricky to get right.

dave

Telstar · 18th July 2009, 05:23 PM

Quote:

Originally posted by aliens exist
Thanks for the reply, but it won't just be a subwoofer, I would like tu cut it approximately near 300Hz.

Then it wont work.

You want my opinion? Go all the way with closed box/BR: a 5" single driver per speaker wont do well in OB either, because of too small cone area and Xmax.

adason · 18th July 2009, 05:35 PM

what you want is called BassZilla
check out Dick Olsher site

adason · 18th July 2009, 05:36 PM

Quote:

just a little suggestion: dont mix BR with OB, unless that's just a subwoofer (<80hz). Or the bass will ruin everything.

you got it all wrong, its been done and it works well

Telstar · 18th July 2009, 05:52 PM

Quote:

Originally posted by adason

you got it all wrong, its been done and it works well

Anything can work, but why to complicate oneself?
BTW, got a link? just curious.

jerome69 · 18th July 2009, 06:46 PM

Salut Camarade !

The MJK project is here :
http://www.quarter-wave.com/OBs/OB_Design.pdf

My opinion, a FE127 is too small to do all the midrange (150-1500Hz) in an OB, I will use it above 800Hz in the upper midrange.
Use instead the 12" a 8" or 2x7" in a (want you want) box. A 8" can easily handle the frequency until 800Hz.
If you want to use a 12" until 300Hz, choose instead a 7" or a 8" for midrange.

This project is very difficult. OBs are not easy to understand, not so easy to find a good geometry (etc.) but the results are worth the efforts to design them

Have fun.

brianco · 18th July 2009, 07:08 PM

For a European view look at the following site:

http://www.lampizator.eu/NIRVANA/nirvana.html

You will find reports, designs etc for more O/Bs than you can wave a stick at!

It is a very 'refreshing' site!

I am actually building a similar Saba mid based O/B but have yet to find decent 15" drivers here in the UK. (Any ideas anyone?)

17th July 2009, 08:33 PM	#1
aliens exist diyAudio Member Join Date: Mar 2005 Location: Near Lyon	Open baffle fe127e with BR woofer Hi there, I have a new project of loudspeaker. I was thinking about a fostex 127e, which I have heard a lot of good things as a medium, on an open baffle with a 12" woofer in a closed box or BR. These will be driven by a gainclone lm3886 and an usb dac (my macbook will be the source with all my albums in Apple lossless). At the beggening it will be passive filter and later I will bought a DCX2496 with a pure class A for the fostex. Was this kind of loudspeaker done by someone here ? Is it a good idea ? Simon.

17th July 2009, 09:16 PM	#2
Telstar diyAudio Member Join Date: Dec 2007	just a little suggestion: dont mix BR with OB, unless that's just a subwoofer (<80hz). Or the bass will ruin everything. __________________ The response of the inner ear extends to at least 200khz - Dr W. Tempest

18th July 2009, 05:12 PM	#4
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	Have a look for the Martin King passive open baffle thread... much like you want to do, but an OB all the way. Mixing types of box (ie box vrs no box) is not impossible but tricky to get right. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

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18th July 2009, 05:00 PM	#3
aliens exist diyAudio Member Join Date: Mar 2005 Location: Near Lyon	Thanks for the reply, but it won't just be a subwoofer, I would like tu cut it approximately near 300Hz.

18th July 2009, 05:35 PM	#6
adason diyAudio Member Join Date: Nov 2004 Location: home sweet home	what you want is called BassZilla check out Dick Olsher site

18th July 2009, 06:46 PM	#9
jerome69 diyAudio Member Join Date: Feb 2008 Location: Lyon	Salut Camarade ! The MJK project is here : http://www.quarter-wave.com/OBs/OB_Design.pdf My opinion, a FE127 is too small to do all the midrange (150-1500Hz) in an OB, I will use it above 800Hz in the upper midrange. Use instead the 12" a 8" or 2x7" in a (want you want) box. A 8" can easily handle the frequency until 800Hz. If you want to use a 12" until 300Hz, choose instead a 7" or a 8" for midrange. This project is very difficult. OBs are not easy to understand, not so easy to find a good geometry (etc.) but the results are worth the efforts to design them Have fun.

18th July 2009, 07:08 PM	#10
brianco diyAudio Member Join Date: Aug 2005 Location: Scottish Borders - Kelso; on the famous Tweed River!	For a European view look at the following site: http://www.lampizator.eu/NIRVANA/nirvana.html You will find reports, designs etc for more O/Bs than you can wave a stick at! It is a very 'refreshing' site! I am actually building a similar Saba mid based O/B but have yet to find decent 15" drivers here in the UK. (Any ideas anyone?)

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