vibrating box

[qguy]

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.

[503Timber]

Does the box reside on the hard floor seen in the picture?

[revboden]

Take the stuff off the top of the box.

[qguy]

Originally Posted by 503Timber

Does the box reside on the hard floor seen in the picture?

Yes, hardwood floor with concrete underneath, supported by the Earth below

[chrisb]

Originally Posted by revboden

Take the stuff off the top of the box.

+1

[qguy]

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 ???

[m R g S r]

^I Doubt it...that box looks pretty well braced, and appears to be 3/4"...unless its 1/2"??

[NEO Dan]

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.

[Ron E]

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.