You might want to try bracing the floor from underneath using some 4 x 4's and / or some hydraulic bottle jacks. You can place the bottle jacks on top of the 4 x 4's to get them up near the floor and then adjust the bottle jacks for the amount of tension you want on the floor. If the floor is poorly suspended and "sagging" all over the place, using another section of wood where the bottle jack and the floor joist meets will help spread the tension out. This will support a larger portion of the floor using fewer jacks, making it a far more useable approach. Then again, this assumes that you can get beneath the floor ( via a basement, etc... ) and that your system is located on the first floor. If you are in an apartment, condo or up on the second floor, this is probably not going to work for practical reasons.
I will only add that altering the distance that the driver is above the surface below it will change the tuning and output characteristics of the sub's. All down-firing drivers are tuned with a given space between them and the support structure beneath them taken into account. As such, be careful with what you use, as it could end up altering performance enough to make you not want to use the subs at all. Sean
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I will only add that altering the distance that the driver is above the surface below it will change the tuning and output characteristics of the sub's. All down-firing drivers are tuned with a given space between them and the support structure beneath them taken into account. As such, be careful with what you use, as it could end up altering performance enough to make you not want to use the subs at all. Sean
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