My woman has a 626 with 6x9's in the rear deck an 5x7's in the door. She has a JVC aftermarket deck. Dont want to run an amp. What round speakers can I replace the 6x9's with? They're more for bass no subs in the trunk. Would 6x9's be better for bass than round? What round speakers can I replace her and my 5x7 door speakers with?