Originally Posted by sacaledus
Ohm'* directly relates to the amount of RMS power your speaker will handle. Lower ohm'* better ability to handle higher power(watts). Higher ohms takes less power(watts). That'* why a lot of stock car stereo speakers are 8ohm because the head units are crap. Unless in your case you have the Monsoon system. I'm sure your deck can push any 6x9 you'll drop in without any sacrifice. Believe me I've done it all.
A speaker'* impedence has nothing to do with its power handling. Materials used during construction and strength/size of the magnet are a few of the characteristics that do effect power handling however. The lower the resistance attached to the output of an amplifier, the more current the amp will want to push to the load. It more less comes down to Ohm'* law. When resistance is halved, current will double assuming voltage stays the same. Resistance doubles, current is halved...ie; less volume at the same gain setting. But as in most things in life, there are exceptions to the rule. Some amplifier'* outputs are fully regulated to produce nearly the same output power to a variety of impedences, and example would be Xtants 1.1i D-class full range amplifier.