Need More Midrange??

hey,
i got a focal 13" polyglass in a sealed box and it sounds good to me but the front speakers just sound like tweaters. They barely put out any bass. What size fronts should i get and is it easy to install larger speakers then what comes in an alero? Also, do any of you guys use the factory monsoon amp to power your fronts and rears?

And, how much dynomat do i need to put in the trunk?

[FormulaNERD]

i have infinity reference series 6.5"s in my door. there are adaptors, but i just used a dremel and modded my stockers