I have a B6 1.8TQM with the Symphony II radio, and am in the process of building a car PC. My question is based on pure newbness, as I have yet to crack the door panels on my A4. Are the speakers individually amped at the actual speaker, is the amp centralized, or is there no amp at all? Additionally, what size are they, they look to be 5 1/4, but may be not. Any one else running a car PC? What are you using?

Thanks,