Originally Posted by SouthArk370Z

The sample I got (10 sq ft, IIRC) covered approx. 1/3 (maybe a little bit more) of the area from the front of the towers back on my '09 Touring w/Bose. If you think you may run out of material, I'd save the area under the spare for last - it has the spare and the subwoofer on top of it, which should do some damping.

Don't expect dead quiet, even with full coverage, but the sample does do a good job of reducing the noise level.