I have head unit Kenwood KDC-U346 & pair of sony-6941 speakers which i directly connected with the head unit without having amp. Now i want to add woofer, i need quality of bass. Kindly suggest me Amp & woofer. I have cultus, speakers are installed on its original fiber glass Board / Phatta. Which board is best in diggi for speakers along with woofer?? I dnt need big bass tube which cover space of rear seat. Also tell me, for balance sound speakers and woofer both need amp??