Using rope caulk (mortite) to seal drivers and damp vibrations

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Rope caulk is known to absorb/damp vibrations. So is it common to use rope caulk (mortite) to damp vibrations in car speakers ? I have noticed people use rope caulk in loudspeakers especially to damp the metal basket and sometimes seal the driver-enclosure joint. and also in CD/DVD players to damp vibrations.

Now the guys where I had my stock speakers replaced with Infinity Reference series 3-way 6x9 did a lousy job. They didnt even put a gasket between the driver and the mounting area so I took it back and had them put it in. Anyway, but I was never really satisfied with the bass performance of the speakers. It was kinda boomy and not so clean. Something was lacking. Yesterday I bought some rope caulk and applied it around the driver flange - above and below the mounting panel - so as to create an airtight mount. Then I went ahead and applied some strips of rope caulk on the basket and magnet and also on the metal areas around the drivers too. To my surprise I found a substantial difference in the quality of bass - much cleaner and faster. NOW I enjoy it.

Is there any other alternative(material or method) that might give me better or similar results ??
 
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