How can I keep my sub from jumping off the ground? - diyAudio
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Old 13th April 2007, 02:02 AM   #1
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Default How can I keep my sub from jumping off the ground?

I finished my sonosub today. Its 18" dia, and 78" tall. It has a Dayton 15" Titanic III driver in it. When the Bass is played loud it actually jumps back and forth off the ground. The thing sounds like a jack hammer. I was thinking of pouring a 3" thick concrete round slab the diameter of the sub, and the sub to the slab with a rubber pad under the whole thing. You guys have any ideas?

Thanks Ben
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Old 13th April 2007, 03:02 AM   #2
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You might want to balance the anchoring you have in mind with a little top mounted ballast.

That's quite a project you have underway. What are we looking at on the right?
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Old 13th April 2007, 03:16 AM   #3
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It's a custom Polk SDA-SRS. * MB 6.5's, and 4 tweets, and 1 10" pr's. Thats just a proto for my next which is going to use 16 mids, and 2 morel tweets(maybe) tri amped with 1000 watts per cabinet of Adcom power. Also some bad wire management. Just moved a bunch of stuff today. I am trying different tweeters till I find the ones I like. The polk RDO silks sond best so far. The morel's aren't broken in yet though. New caps, and resistors in the crossover. Also I didn't put any sound deadening in the tube when I built it. I was told I don't need it. they were wrong.
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Old 13th April 2007, 03:58 AM   #4
OzMikeH is offline OzMikeH  Australia
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May as well make the ballast useful. add some MDF layers to both end plates, dont crowd the port or the driver(s).
I'd worry about the stability of the thing with adding too much mass to the top.

Perhaps 4 external braces beween the two end plates. extend these down past the bottom to become the legs, give it say three inches more height.
Go with the round concrete slab, Add a little peak in the middle if you like, it won't do much but will look quite serious.
Place the whole thing over the new round slab, stick the 4 bits of timber to the base slab somehow (I'd cast a couple of bolts into it)

With the 4 bits of wood varnished it would look quite neat.
You may need to damp the external braces, this can be done later with a toilet roll jammed in the gap until you find the best spot.

deep pile carpet wrapped around the sonotube will help too. Shagadelic even.
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Old 13th April 2007, 05:02 AM   #5
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If you can find something like this in your area, then wrap a few square feet of this around it. Great damping and heavy as ....! Then cover it in carpet to disguise it (looks like rough vinly flooring).

Second option. Instead of just having the wooden blocks on the floor, bolt them onto a concrete slab (or for SAF, a slab of marble). Heavy, and all the weight is at the bottom.

Third option. Build a pretty 'box' to sit at the bottom 2 feet of the tube and fill it full of sand. Looks pretty (if you do it right), will be heavy and preserves the chimney look of your speaker.

Fourth option. Turn it upside down and load the ceiling !
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Old 13th April 2007, 06:25 AM   #6
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Put another Titanic on the other end, facing the other way and wired out of phase.

Well, that's not really a viable solution, huh.
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Old 13th April 2007, 10:48 AM   #7
jonz is offline jonz  Canada
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I don't get it,that sub looks like it's sitting directly on the floor with no 'feet'... tell me thats not the case.
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Old 13th April 2007, 10:49 AM   #8
Shaun is offline Shaun  South Africa
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Some good suggestions given here. My first sub had the driver and a PR mounted at opposite ends of a sonotube. It was built to be a coffee table, so the sonotube was horizontal. It used to walk all over the floor!

I've since rebuilt it into a box with the driver facing down and the PR forward. But now it rocks (literally)!!
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Old 13th April 2007, 10:57 AM   #9
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Quote:
Originally posted by jonz
I don't get it,that sub looks like it's sitting directly on the floor with no 'feet'... tell me thats not the case.
I was wondering that, too. If the driver is facing down on the bottom, it needs some cutouts to breathe. Very large cutouts.
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Old 13th April 2007, 11:08 AM   #10
OzMikeH is offline OzMikeH  Australia
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it has what looks like approx 3 inch legs.
Looks like enough breathing room to me. It's the high velocity cone that would be the biggest force moving it.
A simple way to check is to turn it up the other way and see if it still walks.

Sonotube is pretty light. needs more mass I'm sure. (will make it harder to steal too)
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