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Old 19th June 2012, 03:36 PM   #11
GM is offline GM  United States
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Right, mass loading a speaker is best done by adding top weight, with a heavy potted plant being a popular choice with you-know-who .

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Old 19th June 2012, 03:50 PM   #12
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With the current popularity of synthetic stone ( Quartz, etc) counterops, you might well be able to find offcuts available at local fabricators that could yield a suitable sized piece. I've been able to reclaim sufficient for several base slabs at zero cost from a local shop, but unless you have appropriate wet saw and polishing tools, the cutting and finishing the exposed edges could cost set you back a few $ - (try the ole "Friday afternoon "24 pack" incentive)

A couple of dabs of silicone or even high strength double edge carpet tape, and that slab ain't going nowheres.
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Old 19th June 2012, 03:58 PM   #13
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Quote:
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Right, mass loading a speaker is best done by adding top weight, with a heavy potted plant being a popular choice with you-know-who .

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I've added three garden stone slabs at 14kg/each + my two amplifiers on top of my subwoofers. They aren't going anywhere
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Old 19th June 2012, 10:06 PM   #14
Ephai is offline Ephai  United States
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I've added three garden stone slabs at 14kg/each + my two amplifiers on top of my subwoofers. They aren't going anywhere
I'd say. I was thinking like a 0.4 cubic foot chamber for about 40 lbs. (~18kg) of extra weight would suffice.

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Build a form to fit and pour a 2-3" thick concrete slab to sit directly on top of the cabinet, but detachable. Paint the slab to match.
Unfortunately I have a bit of a height restriction since the sub will be placed behind a reclining couch, but have an unlimited amount of space available for the depth. Hence the thought to put a sand filled chamber on the end of the cabinet opposite the subwoofer.

I hope it will work. It might make for a slightly awkward looking enclosure though (long and skinny: 24" x 12.5" x 12.5").
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Old 20th June 2012, 12:55 PM   #15
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You can build the sub down firing in your cab. It only needs 2-3 inches clearance underneath.
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Old 20th June 2012, 01:47 PM   #16
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If the driver's compliance can handle it long term: Parts Express - Subwoofer Qualification Formulae For Downfiring Configurations

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Old 20th June 2012, 04:30 PM   #17
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Originally Posted by chrisb View Post
With the current popularity of synthetic stone ( Quartz, etc) counterops, you might well be able to find offcuts available at local fabricators that could yield a suitable sized piece. I've been able to reclaim sufficient for several base slabs at zero cost from a local shop, but unless you have appropriate wet saw and polishing tools, the cutting and finishing the exposed edges could cost set you back a few $ - (try the ole "Friday afternoon "24 pack" incentive)

A couple of dabs of silicone or even high strength double edge carpet tape, and that slab ain't going nowheres.
In contrast to that build a matching wooden frame and inset the stone. .. if on top, build the box sides/top edges to suit. Now a guy just has to worry about the edges of the stone .. 1/8" chamfer or so.
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