I have my pc hooked up to a boom box which is running a pair of jbl 610s, sounds pretty good for movie clips and rock videos, i was wandering if i got a 8'' yamaha or sony sub can i run main speaker lines in to sub and then to speakers and still pick up the amp in the sub or will i bypass it hooking it up that way , my boom box does not have a sub output on the back , i would sure like to use the amp in the sub ,i dont think the boom box has enough power to run 610s and a sub.