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Old 8th August 2011, 04:01 PM   #1
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Location: New York
Default OB sub vs boxed

Since I will be moving in the next month or two into my parent’s house (divorce) I moved my stereo there. The room will not accommodate H-frames but the Beta 12 open baffles (with supertweeters) will fit nicely by the fireplace (pics to come). They will be replacing an old pair of AR92s.
Rather than dismantle the H-frames I will keep them intact and leave in storage until I move again in hopes I will be able to use them. I have an extra Jamo 15” buyout woofer that works well in my son’s open baffle and thought I’d build an OB to enhance the bass (necessary with the Beta 12’s on OB). The woofer sims OK (I compared to the venerable Alpha 15 as a benchmark). Then I tried the inexpensive GRS 15” paper woofer and it simmed really well. Basically it's a 24" baffle that will be about a foot from the side and rear wall and i simmed it as being 4" from the floor.

GRS 15PF-8 15" Paper Cone Foam Surround Woofer

I will probably use the 15” Jamo buyout but for your convenience I wanted to post my sim for anyone considering an OB woofer.

Also, since I only have room for one, does anyone have any comments on using just one woofer (powered by a sub amp) as a subwoofer compared to using a more traditional woofer in a box? I hope I can achieve reasonable volume levels (no need to rock the house but a satisfying low end would be nice at reasonable volume).

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Old 9th August 2011, 01:49 PM   #2
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I will build it and let you know how this turns out. Wood already cut.
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Old 9th August 2011, 01:55 PM   #3
MJK is offline MJK  United States
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Join Date: Feb 2002
Location: Clifton Park, NY
Have you considered this driver?

Goldwood GW-215/4 15" OEM Woofer 4 Ohm

Run the simulation, I think it will go lower and is a bit more efficient. Low Re means a smaller coil for a passive crossover.

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Old 9th August 2011, 08:20 PM   #4
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Yup, that one sims quite nicely and with a bit of a bump before rolling off. -3 @ 26hz.

Unfortunately, the driver i have on hand sims the worst. But at least others might be able to do something similar and get better results. If the driver i have now is not up to par sonically it's nice to know alternatives are relatively cheap.

This 'subwoofer' will really be very slim on the floor. I hope it works out nicely!

Thanks Martin, i appreciate your suggestion.

PS... the sim shows how higher qts drivers have the advantage on OB. Typically these drivers are less expensive too.
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Last edited by Godzilla; 9th August 2011 at 08:27 PM.
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