I'm replacing my rear 4" speakers (because I removed the A/C).  The new
speakers have a (+) and a (-) connection spade.  How do I know which wire is
(+) ?  Is the (-) a ground wire? Will you burn something out if you get it
wrong?

PS - Will a 5.25" speaker produce better or more sound than a 4" speaker
given the same input?

As you can tell, this design engineer - carpenter - teacher knows squat about
electronics...

Thanks
Brian Doss
'88 Weekender, Queequeg