Actually won some speakers in a raffle at work. Here is my question, they are Sony xs-mp1610B marine speakers. brand new, size is 5 5/8 from one mounting hole to the other; 6.5 in speakers; peak power is 140w; rated power is 40W and the speakers are 4 ohms. Can I just replace my facotory speakers with these? Are the factory ones in parallel or consecutive?? Not familiar with radio stuff but remember something about parallel and consecutive. Not at home to do research so hope you guys can help me out. thanx.