Join Date: Aug 2011
Location: Fayetteville, AR
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You may think your tweeters are fine, but let me tell you, when I replaced mine, it was a huge difference. Food for thought. They are the last speakers I would upgrade though.
Door speakers will be a piece of cake. I do not know what the wattage the factory amp puts out, but it is sufficient to power nearly any 6.5 inch speaker you would put in.
A note on the front speakers. The system runs on an 8 ohm load. Most aftermarket speakers are 4 ohm speakers. The front speakers run in series from the amp. The nOn Bose systems are that way, and I believe Bose is the same. So the door speaker is 4 ohm, and so is the tweeter. 4+4 to make the 8 ohm load. If you want to confirm this, take one of the a pillars off. It is a piece of cake. Then on the back of the tweeter, it will be stamped with the resistance. I would go with a coaxial speaker in your case, since you are running off the factory amp. If you were to get a component speaker, you would need to find a place to mount the separate tweeter, and run it off of the same channel. So doing a coaxial speaker will just he easier. You will get extra highs that way. If you were doing a full stereo install on the other hand, with an amp and such, I would recommend a component set. But right now, stick to coaxial.
For the rear speakers, I would leave those alone on the Bose system. They are 8 ohm, and replacing that with a 4 ohm would cause the factory amp to attempt to push out twice the wattage since resistance is half of what it is used to, and it cannot handle that. Eventually, it would overheat. You won't notice a big difference replacing those either. Save those until you do an amplifier, if you ever get that far.