Soundproof to boost my speaker's sound quality

[miiser]

Hey,
I just changed my front speakers with a pair of jvc cs-620x. But I am not happy with the overall result. I mean ok the sound is significantly more clear, but the bass is terrible. They sound worse than the stock cheap ones. I know that paper speakers produce more bass but the difference is day night right now. I am pretty sure that it's not speaker's fault cause before I bought then I looked for reviews and ratings and all of them were positive.
So, I think it's all about the soundproof and my door can produce bass the way it is right now. With this in mind I have to invest in some soundproof materials. I know about dynamats, but they are too expensive for me right now. Anyone who come up with some alternatives? I want to keep it cheap as possible but in the same time effective.

I wish it's all about the soundproof of my door. All I hear from the speakers right now is tzmp tzmp tzmp. And I am really disappointed.


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