Opened Baffle design HELP!!

shaunly · 25th January 2008, 06:09 AM

I am thinking of trying out an OB setup but aren't every clear of how it all works. Basically all I know is that depends of the baffle shape ( I, H, M or U) it effects the response. How do I calculate the sizes of each baffle. I also see some OB designs where is just basically a baffle holding the speaker (I shape), but wouldn't that create phasing problem and cancelations? I'm currently runing a 2-way DIY set using the 7" scanspeak REV and LCY110 ribbon. I eventually want to add a subwoofer to that but want to try OB everything. Also what size, sub and how many do you guys recommend? It'll probably be crossed around around 150-200 and down. I've audition some dipole setup at CES and really like how responsive and natural it sounded. One more thing, what about if I just go dipole with the 2-way and maybe sealed with the sub? The only concern I have with that is the effeciency between the two. Any information will be greatly appreciated. I am still a noob so fill me up with everything you got! thanks!

Rudolf · 25th January 2008, 08:43 PM

If you really want to design your own 3-way-OB setup, you need to understand the basics of the website of Linkwitz (the link is a good start).
If you don´t want to dig into any theory you better look for some proven designs with the corresponding drivers.
May be you should also hace a look at the Open baffle forum at audiocircle. The guys over there somewhat spezialize in OB designs.

john k... · 25th January 2008, 10:40 PM

Check my site. Look at ABC Dipole.

opp · 25th January 2008, 11:22 PM

Basically you have to choose between two main roads:
1) physical optimization
2) electronic compensation.

In real life it's often a compromise.

I'm playing around with digital filtering and compensation (e.g. DRC) and a lot can be achieve this way. But physics can't be beaten. So, the process is: build the speakers as large as you can/want (the wife, cat, bank and neighbor has a say) and then compensate electronically.

I believe Linkwitz Orion is a very good balance.

hitsware · 26th January 2008, 03:20 AM

Assuming a rectangular baffle sitting on the floor:
The -3db point of the equivalent 1rst order HP filter
is @~ 360' / width of baffle'

25th January 2008, 06:09 AM	#1
shaunly diyAudio Member Join Date: Nov 2004 Location: OC, CA	Opened Baffle design HELP!! I am thinking of trying out an OB setup but aren't every clear of how it all works. Basically all I know is that depends of the baffle shape ( I, H, M or U) it effects the response. How do I calculate the sizes of each baffle. I also see some OB designs where is just basically a baffle holding the speaker (I shape), but wouldn't that create phasing problem and cancelations? I'm currently runing a 2-way DIY set using the 7" scanspeak REV and LCY110 ribbon. I eventually want to add a subwoofer to that but want to try OB everything. Also what size, sub and how many do you guys recommend? It'll probably be crossed around around 150-200 and down. I've audition some dipole setup at CES and really like how responsive and natural it sounded. One more thing, what about if I just go dipole with the 2-way and maybe sealed with the sub? The only concern I have with that is the effeciency between the two. Any information will be greatly appreciated. I am still a noob so fill me up with everything you got! thanks!

25th January 2008, 08:43 PM	#2
Rudolf diyAudio Member Join Date: Mar 2003 Location: Germany	If you really want to design your own 3-way-OB setup, you need to understand the basics of the website of Linkwitz (the link is a good start). If you don´t want to dig into any theory you better look for some proven designs with the corresponding drivers. May be you should also hace a look at the Open baffle forum at audiocircle. The guys over there somewhat spezialize in OB designs. __________________ www.dipolplus.de

25th January 2008, 10:40 PM	#3
john k... diyAudio Member Join Date: Aug 2004 Location: US	Check my site. Look at ABC Dipole. __________________ John k.... Music and Design NaO Dipole Loudspeakers. "We have no right to assume that any physical laws exist, or if they have existed up to now, that will continue to exist in a similar manner in the future." Max Planck

25th January 2008, 11:22 PM	#4
opp diyAudio Member Join Date: Jul 2005 Location: Aros	Basically you have to choose between two main roads: 1) physical optimization 2) electronic compensation. In real life it's often a compromise. I'm playing around with digital filtering and compensation (e.g. DRC) and a lot can be achieve this way. But physics can't be beaten. So, the process is: build the speakers as large as you can/want (the wife, cat, bank and neighbor has a say) and then compensate electronically. I believe Linkwitz Orion is a very good balance. __________________ time flies like an arrow ... and fruit flies like a banana

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26th January 2008, 03:20 AM	#5
hitsware diyAudio Member Join Date: Mar 2002	Assuming a rectangular baffle sitting on the floor: The -3db point of the equivalent 1rst order HP filter is @~ 360' / width of baffle'

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