2000 Grand am rear speakers

I had to replace the rear speakers in my Grand Am last night. While taking the speakers out, there were 2 plugs connecting the speakers to the factory wiring, each plug consisting of 2 wires. I went and purchased a set of Pioneer 6x9 4way speakers that are supposed to be direct replacements for the stock speakers. The Pioneers only have leads for 2 wires total, not 4 as supplied by the factory set up. When I hook up the light blue and dark blue wires from one of the plugs, the speakers seem to work fine. If I try to hook up the other 2 wires from the other plug the sound quality diminishes. What I am trying to find out is what are the other 2 wires for and are they necessary for the Pioneers or are they just required of the stock speakers? I want to make sure that I am getting full use of the Pioneer 4 ways. Any help would be greatly appreciated.

The OEM plug has two sets of wires because one set is for the tweeters and one is for the woofers. If you use the wrong set ( tweeter set ) you will only get highs out of the wires ) If you use the woofer set you will get full range from the speakers.

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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

  Hey Jeff, THANKS. That is exactly what I was looking for. I was just at the Pontiac dealer and they were looking at me like I was speaking Chinese to them. I am assuming that the light blue and the dark blue wires are the woofer wires as those are the ones giving me the sound I was after. Do you think I should use different(thicker) speaker wires or are the stock ones sufficient for what I have done?