I currently have the 4-speaker system and was looking on ebay at a six disc unit from an SE model. Currently I have speakers in all four doors, where are the two extra speakers located in the Se and SEL models.
They are tweeters in the a-pillars as sternyy said. I replaced my front door speakers with 2 ways, so I removed the tweeters. The factory door speakers had a crossover that sent the highs to the tweeters. The tweeters didn't have a separate channel, so to speak, it just took the highs from the signal sent to the front door speakers.
A forum community dedicated to Ford Fusion and all Ford vehicle owners and enthusiasts. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance for the Focus, Fiesta, Taurus, Mustang and more!