I took apart my roadmaster set (Maybe put decent modbass speakers in the box?) and after checking the tweeters, I noticed they have a very very stange crossover setup.
Positive attaches to a little HP crossover that looks like a resistor that then goes to the tweeter's positive terminal. Negative attaches to the negative terminal, then goes through a second HP crossover, exact same kind, and into positive! What the hell is that?