I got a sharp CD-BA300 mini system. It's made for 2-way speakers, (mid & tweet) and subwoofer. There is a left & right output for the speakers (a total of 4 outputs). My question is, could I instead of running two subs powered by the amp alone. Run 1 bigger self powered sub for better bass. The amp itself only puts out 75watts max per side. If this can be done, how & what will I need? Any good sub suggestions too?