...polarity protection? Well I was using a mirror to read the terminals on my amp while hooking it up in a awkward location on my boat and I hooked the ground and positive wire up backwards. I should have done this before I started drinking out on the water. Big mistake on my part my Rockford...
Not likely, adding tweeters to your deck is fine in most cases. Some decks will cut out if it detects a difference in load between the speakers but that is rare. Make sure the tweeters came with a resistor or some sort of crossover/bass blocker to prevent bass from damaging the tweeters.
Jews were disliked during WWII by Germans and Hitler because of the Depression Era. In Germany, while many of the other people were doing really poor, Jewish people were slightly better than the rest of the country. The Jewish religion had nothing against making profit, and unlike Christians...