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 Post subject: 15 inch woofer for OB
PostPosted: August 31st, 2020, 6:25 pm 
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Joined: January 15th, 2015, 7:19 am
Posts: 1314
Location: Baltimore MD
What parameters do I look for for a two way OB system with two 15 inch woofer per side


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PostPosted: August 31st, 2020, 8:31 pm 
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Joined: February 28th, 2013, 1:19 pm
Posts: 489
Paul,

I looked into this when I was considering an open baffle woofer for my Bassillas. Normally you look for a woofer with a Qt from 0.5 to 1.0. I think the Goldwood 18" woofers Roscoe used on his baffles a while back were at the upper end of this range. These have a response rise at the resonance frequency that helps compensate for the 6dB/octave baffle rolloff and extend the bass response. However with an active system, or passively if you are using a very efficient 15in driver (or two) you can do this with a bass lift filter network and a more highly damped driver. It will require more amplifier power though.

This is just a broad brush. You can find some good information from designs by Olsher, Pass, Linkwitz, and others on open baffles (or H-bins, slot loaded, all variants that extend the baffle size by folding).


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PostPosted: August 31st, 2020, 8:46 pm 
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Joined: January 14th, 2015, 11:15 pm
Posts: 387
You should find the following links useful.

https://www.diyaudio.com/forums/multi-way/110583-fast-fun-inexpensive-ob-project.html

https://www.diyaudio.com/forums/multi-way/355643-eminence-alpha-ob-question-4.html

ray


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