Actually, the HV (330V) battery is the one in the rear, and if the vehicle won't start, it's because that one is dead. The 12V (front) battery doesn't start this vehicle as it does in conventional ones. When you do the "jump" start - the one that takes something like 8 minutes - you're actually using the 12V to juice up the HV battery enough to start the vehicle.

Regarding speakers, if you have tweeters in the window sail, then you have component speakers.... separate components. "Two-way" or "three-way" speakers where they're all together in one unit may also be component speakers (though most are not), if each of the speakers is fed separate inputs. So if you have a crossover, they're components. I never heard the factory component speakers, but my guess is that going with two-ways instead, would sound worse. Not only would you lose the separation of highs & mid-lows, you'd lose the highs coming from a much better speaker placement in the sails.