LifeProof IPhone 5 sound problem?

I buy the cover for my phone and noticed a significant decrease in audio power, is a 40% compared to before, is this normal? Dry the case with a hair dryer, may have broken something? I have to quit something to the case? I have an iPhone 5, thanks.

The part has just become available as replacement part! Some may know this already, you can always try to fix it yourself.search model name plus "repair guide" on any search enginge. They will show details about about part replacent etc. In detail. There are other websites that sell all the replacement parts, one of the bigger ones is http://portatronics.com (646) 797 2838. Then for the repair itself you can venture to do it yourself, or better ask a friend who has done a similar repair before.