I'm looking at Autobahn's for my Audi A4 '00. It's the component package and it's depth for the 5 1/4" 1 7/8. Is that to deep? I'm also looking at getting a 4 channel x 75 watts. 2 channels for the 5 1/4's and 2 channels for a 10" sub. What do you think? I'm really poor! I'm going to get a connector for the back of the HU so I have preamp outputs. Am I missing anything and how hard is it to get the panel off the door to replace the speakers and run wire? I'm a virgin at this. Check out the 5 1/4's I'm looking at, link below.
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I'm not sure about the depth for the A4, I don't have one, but I am pretty sure that you will be under powering a pair of 10s with only 75 watts.