I bought a Kenwood Excelon head unit & some infinity reference speakers for my truck (the component type in front) & the difference is very, very nice, but... I want more bass at low listening volumes. My little powered subwoofer hooked to this computer has the kind of kick I want. What do I need to get more bass sound without adding a big box in the back? I'd prefer to put it under the front seat. I don't listen to anything very loud, I just want to feel/hear some bass. I know nada about amps, etc. . this is the nicest sound sytem I've ever had, but I need more bass to offset the sweet tunes the Cummins sings 
