Empty JBL 4648 box, what to put in it? - AVS Forum
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post #1 of 6 Old 08-11-2012, 03:37 PM - Thread Starter
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I have a JBL 4648A box that I just took the drivers out of (needed them for another project) and instead of ditching the box, I want to make a sub. The 2 holes are for 15" JBL pro drivers and the whole thing has an interior volume of 8ft^3. I would like to play down to around 14Hz. Any suggestions on two drivers for this endeavor? Or one driver and I can fill in the other hole. I was thinking about sound splinter drivers but I'm not sure that would work best for this application. Any thoughts?

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post #2 of 6 Old 08-11-2012, 04:59 PM
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14hz in that box? Gonna take some serious modifications. Maybe a single Dayton dvc15 with new ports and one 15" hole plugged up. That case was designed for 40hz and up. Trust me, I have three. tongue.gif

My Dual 18" LLT subs 120dB down to 10hz

 

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post #3 of 6 Old 08-11-2012, 06:24 PM - Thread Starter
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Hmmm. Well shoot. I guess I'll just leave it alone then. Are there any mods I could do to it to make it more sub-subwoofer friendly? Like filling ports and such? I feel bad having such a good box and nothing to do with it.

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post #4 of 6 Old 08-11-2012, 11:29 PM
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You could always just plug the ports and run a pair of 15's sealed. Not sure what your plan for power is, but with pro amps a pair of 4 ohm subs in one cab would be no problem. If you wanted to use a plate amp you could still find suitable drivers to get a net 4 ohm load.

A pair of RS15HF's would be a good option, with a F3 of 31hz in that box sealed

http://www.parts-express.com/pe/showdetl.cfm?Partnumber=295-468
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post #5 of 6 Old 08-12-2012, 10:08 AM - Thread Starter
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How hard would it be to mod the box to become this: http://www.jblpro.com/catalog/general/Product.aspx?PId=206&MId=1. Box is the same, the front baffle is the only difference.

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post #6 of 6 Old 08-12-2012, 10:18 AM
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You would just have to sand down the front baffle, and bond a new piece of wood over the top. Then cut an opening for an 18" woofer on the bottom, and a 6" port on the top. With a 6" x 13" port you would be tuned to around 23hz. Something like a Fi BL18 would work well in that box.
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