hmm..if youre using your stock speakers then the sub will be overwhelming your sound sys wit a lot of low bass..either power your stock clarion speakers and get a pair of tweeters or get a good component set for your front..then you can enjoy a full spectrum of sound!! welcome to ICE modding!! hehe after this sure you will be playing around with speakers ready..

its called a ported enclosure bro,the one with a hole..ported encolsures produce better clarity over a narrow frequency and has better power handling but doesnt boom as much as a sealed enclosure (your current type)
Depending on your sub,some work better in ported some in sealed..depends on your sub spec..mines a sealed enclosure like yours..i like the setup tho



erm yes it is suposed to play only low frequencies..if your sub is producing vocals (mid freq) its gonna K.O very soon as subs are not designed to handle other ranges of frequencies well so it will try to reproduce sounds its not ment to and get destroyed.either use your amp to select your sub out to low freq or get a crossover..