If one has the time(especially during these lock down/pandemic times) can do a DIY as I did on my Creta.
During the speakers installation I did not opt for any professional damping and put it off for later. (as you can see from the pics)
During the lock down I happened to come across this reasonably good damping material available at a reasonable price (through social media). I took a chance by ordering it online and waited with albeit baited breath till it arrived (this was first of a kind purchase I had done through Instagram). But the seller @vibrofiltr_india was very prompt in responding and shipping the product. I procured 15 sheets at about 10.5k including shipping. The thickness was 1.8mm.
All you need are simple tools and time and love for the car to get it done yourself. Adding a few pics I took during the process.
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Forgot to include paper/sheet cutter in the pick.
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Front Door - Before
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Front inner layer
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Front - Done
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Rear - Before
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Rear - Inner Done
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Rear - Done
Do remember to use a rubbing alcohol to clean the surface before pasting the damping sheets.
After this, there is a considerable reduction of road noise in the cabin, remarkable improvement in sound quality and doors feel solid.
All in all, very satisfied with the time, effort and money spent.