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Old 17th December 2004, 11:31 AM   #1
diyAudio Member
Join Date: Feb 2004
Location: Racine, Wisconsin
Default Convert horn enclosure to sub enclosure

I built the recommended Fostex enclosure for a 206E, 8" single driver.Here's the enclosure for reference.

I have listened to the speaker for a few minutes and came to the sudden realization that full range single driver schemes aren't for me. I like my line arrays.

I would like to convert this to a bass speaker covering a range of ~40 to 200 Hz to augment the bass of the LA's consisting of 4" NSB's. The current sub I am using is kind of a commercial turd. This is not for HT but for music. I believe that I can re-engineer this box to accept a 10" woofer.

I would appreciate any suggestions.
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Old 17th December 2004, 12:25 PM   #2
Join Date: May 2004
Location: New Hampshire
Sell it and start from scratch. The amount of work involved doesn't justify the effort, and you'll get a much better result going with a design that was intended as a sub to begin with. And unless you stack them atop the sub don't go for a 200 Hz crossover, 100 Hz is as high as you want to go. I cross to my 8 element NSB arrays at 80 Hz.
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Old 17th December 2004, 07:01 PM   #3
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Join Date: Feb 2004
Location: Racine, Wisconsin
Fitz... so the rolling off the sub at about 100 with a second order would match the natural roll off of the NSB's, right?

Could you suggest a moderately priced woofer? You would suggest stereo on the subs, correct?

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Old 17th December 2004, 11:11 PM   #4
Join Date: May 2004
Location: New Hampshire
My 8 element arrays actually measure quite flat from 125Hz anechoic, and I have them corner placed, so in room they run pretty flat to 80 Hz. I use them with a single Tuba 18, for which I have the LP filter set at 60 Hz, and they integrate quite well. My sub driver is the MCM 55-2421 eight, which of course I can only recommend when loaded in one of my horns. They're out of stock at the moment, as the guys who built AutoTubas cleaned them out, but they're got more coming and have increased the number they're stocking in the future to keep up with the demand created by Tuba builders.
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Old 17th December 2004, 11:28 PM   #5
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Join Date: Jul 2003
Location: Seattle, WA
Hey Bill!
Congrats on another great AudioXpress article. It's no wonder MCM is out of stock. In that enclosure how can you beat it for a $30 driver?
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Old 22nd December 2004, 03:54 PM   #6
MPM is offline MPM  United States
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Join Date: Sep 2004
Location: Alabama
BillFitzmaurice - I cross to my 8 element NSB arrays at 80 Hz.

Maybe I should get the THLA plans also to go with my Tuba 18. Once again Thanks Bill for your contributions to the DIY crowd that doesn't have alot of money for projects.
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