We never cut any corners, even on this basic work truck. We always use sound deadening material on all of our speaker installs. Screwing speakers directly into metal, can cause vibration and unwanted humming and buzzing noises. So to absorb that, we use Stinger Roadkill Sound Deadening Material.
http://www.memphiscaraudio.com/
http://stingerelectronics.com/catalog/sound-damping-roadkill/
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