powered sub

need help ......i guess i made a mistake and bought a junk yard powered sub called the rock box . i've adjusted it several times and still not what i'm looking for in deep pounding bass . HE** my 200 watt 6x9's in boxes sound's better than this pos . oh btw this system is in a 94 silverado ext cab . head unit is a 200 watt pioneer am/fm/cd . using factory 4x6's and a pair of pioneer 200 watt 6x9's in boxes for more bass . now that out of the way what's best and cheapest powered bass tube on the market that will fit in the back on the floor driver side .

   I have always like the Bazooka tubes, both powered and non-powered they put out really good bass and take up little space, infinity has a space saver sub in the box and amplified most circuit city's have them and those put out soem really deep bass and are soemtimes smaller than the bass tubes.Yes, money is everything when it comes to a huge system.