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Old 7th September 2011, 11:12 PM   #1
qguy is offline qguy  Canada
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Default vibrating box

Got a subwoofer in a 19 x 19 x 21 box, the box vibrates, no sound from the box, but stuff on top of the subs moves. Any suggestion, its 3/4 MDF with braces.

Would metal spikes be of help, right now it has rubber feet.


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Old 7th September 2011, 11:32 PM   #2
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Does the box reside on the hard floor seen in the picture?
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Old 7th September 2011, 11:35 PM   #3
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Take the stuff off the top of the box.
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Old 8th September 2011, 01:19 AM   #4
qguy is offline qguy  Canada
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Quote:
Originally Posted by 503Timber View Post
Does the box reside on the hard floor seen in the picture?
Yes, hardwood floor with concrete underneath, supported by the Earth below
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Old 8th September 2011, 01:21 AM   #5
chrisb is offline chrisb  Canada
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Quote:
Originally Posted by revboden View Post
Take the stuff off the top of the box.

+1
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Old 8th September 2011, 01:35 AM   #6
qguy is offline qguy  Canada
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I dont really mind that the stuff on the top of the subs vibrates, I am just worried (read as paranoid) that the vibration is messing up with the SQ, if any ???
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Old 8th September 2011, 04:33 AM   #7
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^I Doubt it...that box looks pretty well braced, and appears to be 3/4"...unless its 1/2"??
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Old 10th September 2011, 09:52 PM   #8
NEO Dan is offline NEO Dan  United States
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As long as the feet are not too compliant (soft) you may solve the problem by removing two of the feet from the corners and placing one in the middle to create a triangle.

If you want to have something on top of the sub grab a granite surface plate 18"x24"x3" are common and weigh in ~170 lbs.
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Old 11th September 2011, 01:51 AM   #9
Ron E is offline Ron E  United States
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It could be box vibration. If you sit on it do you get a massage Does it vibrate more where there is no bracing? Do these areas have a lower pitched "knuckle rap test" If so, try gluing on some 1x2 hardwood ribs on the ~10"x10" unbraced areas.

If the cone is very heavy you could be running into a "reaction mass" issue and some sort of resonance with the springiness of the feet. Spikes could help, but no more than solid feet. If your floor is not level (and none are) using three rather than four feet will be more stable.
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