94 q45 Factory Audio Questions

[SunnyTk]

Soo I wanted to upgrade the speakers and head-unit on my 94 q45. It has the Bose system with 10disc cd changer (not sure if thats an option). Soo I took apart my drivers door to see exactly what size the front speakers are since I couldnt find any info on speaker size. I took out the 5.25" midrange speaker from the panel and noticed a little amp/box behind it. I assume it is a sort of crossover, and if it is, would I be able to keep it? I assume the rear speakers are 6x9"s

SOO, my questions are,
What is that box behind the front speakers in the doors?
Where is the bose amp?
How do I bypass the bose amp without running all new speakers wires to each speaker?
Where do I find a CORRECT wiring harness for an aftermaket Double din head unit that allows me to use my cd changer?
How do I remove the A-pillar to get to the tweeters?

thanks in advance

[lino]

Here are some threads you might be interested in reading to help get you started:

Interesting find about the early G50's audio system
post4246291.html

Anyone use Crutchfield supplied parts to replace 94-96 stereo headunit?
post2986191.html

Upgrading OEM Stock Bose Stereo Speakers etc
post1972423.html

Are all G50 Q45 speakers and amps the same?
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Aftermarket speakers in the front doors of a 94 Q
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G50 door speakers
post2405927.html

1994-1996 Q45 Tweeters on a 1990-1993 Q45
1994-1996-q45-tweeters-on-a-1990-1993-q45-t431520.html