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line the inside walls with clay and or duct seal which is like clay but used for sealing electrical conduit. You can find duct seal at Home Depot in electrical isle. usually bottom shelf. its very dense, just like clay, easily moldable and allows u to push into areas you cant get dampening sheets. every speaker enclosure set up I do , I line with as much duct seal as I can fit. then fill enclosure with insulation like rockwool. polyfill isnt dense enough to have as much of an effect. Id avoid blue jeans type insulation and similar products bc its actually too dense and will take up airspace and choke off the midrange.
 

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I've had zero issues with it in any vehicle. I have approximately 3lb per side in each of my dash enclosures in the cowel area of my TSX.
There is 6lbs in each 8" kick panel.

Some modeling clay will melt and cause issues but duct seal will not.

In my wife's e46 there was 3lbs per side for the 3s in the dash.
And nearly 8lbs per side for her kick panels.

Most people do not realize how much damping resonance can improve a system. It's a very simple. But time consuming thing that majority of people overlook.

Make the speaker enclosures, especially the mounting surface as dead as possible and all surrounding surfaces dead.
That way the speaker can actually reproduce music and not excite panels and resonances.
 
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