marcmorin
RIP 1953-2020
The Dynamat would work if the springs were a stiffer rate, as Marc said, the added mass needs to be addressed .
here's a simple test of the stuff. take a long screw driver and use it like a stethoscope. wrap the shaft with the dynamat, and retest. loss of sound? nope. It works on wobbly panels of metal, like furnace duct work, etc. Once a noise gets into metal, it travels longitudinally. no amount of goo-pucky added to the surface will reduce it's velocity or amplitude. Where does the noise in the subchassis come from? the two major sources are from the suspension studs, and main bearing. Suspension stud noise comes from motor energy into the top plate and transferred up through the springs into the subchassis.