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Proper method when rack is not on cement floor

I'm moving my 2 channel system into another room. Right now it's in a room that has a wood floor over cement (with area rug), so I have the rack spiked to the floor and everything seems okay. The new location is still on the first floor of the house, but the floor is over a 2-1/2' crawlspace, so it's pretty much a hollow cavity under the rack. Again it's a wooden floor, but with a rug. Is spiking under the rack still advisable for this sort of arrangement? If not, what is the preferred method?

The rack will be in a corner location in this other room, if that helps.
tonyptony

Showing 3 responses by rushton

rushton's avatar
rushton
2,445 posts
 
I've had good success using my rack spiked to a wood suspended floor. Since you're over a crawl space, you might consider one more step: install some extending jack posts under the floor joists in the crawl space to add more rigidity to the floor. They were a big help here, even with my rack at a wall location near a corner. They also helped with the overall tonal balance in the listening room by reducing some of the floor flex. Here's a sample 3' post from Home Depot.
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rushton's avatar
rushton
2,445 posts
 
Sorry about the bad link. Yes, the Tiger Brand posts are the ones I used and was trying to show you.
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rushton's avatar
rushton
2,445 posts
 
Yes, that is the idea. The jacks are very heavy steal, with plates at top and bottom, and a threaded rod at one end. They telescope to several interim lengths, you choose the length that is just short of your overall height from floor-to-joist. Then you turn the threaded rod until tight between floor and joist, and turn a bit more to either add just a touch of support or a bit more beyond that to lift out a sag. By using a number of these, you can end up with a very rigid, very strong, floor.
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