Proper method when rack is not on cement floor

Tony, Rushton's idea is a good one, but let me offer one more bit of advice to take that a step further. When installing the floor jacks, mount a 4' x 4' on top of them and use three jacks. The jacks themselves should be spread out but spaced so that they are directly underneath floor joists. Even though the 4x4 will lift and support the flooring, it is better to have the jacks directly underneath the joists for what should be obvious reasons.

By using the 4x4, you lift abd support that whole section of the floor in a somewhat even manner, making it even more rigid. Placing large sections of flat patio type stone under the floor jacks also spreads the load out over a wider area and keeps the jacks themselves from sinking into the soil.

This whole project shouldn't cost you more than about $30 - $40 at the very most and should make a substantial difference in the solidity of your flooring and what you hear. I just hope you've got a good friend that is both skinny and limber that works cheap : ) Sean
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I would take steps to shore up the area underneath the speakers and / or rack areas as best possible, wherever that might be. Once you've got those areas as solid as possible within reason and WAF, anything else would be icing on the cake. As to the benefits of doing this and / or reinforcing other areas of the floor, that would depend on the solidity of the floor to begin with. The more bounce that it has, the greater the benefit would be in terms of stiffening it up. Sean
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