Hello colleagues! My Alfa is a 156 sports car 3/2001. Now I have a lot of Car Hifi items lying around from my last vehicles. In the garage it is not worth anything, I prefer to build it in my Alfa 😉 I have the following plans: -USB Radio -4 speakers in the doors replace -2-channel power amplifier (Rockford) -Suwbooferkiste (Rockford) This should make the sound quite ok in the Alfa. Can you give me tips on the following questions: -Now an Alfa phone radio is installed, need Is there apertures for normal radios because the radio shaft has a “abbreviation” to the top? -What speakers are in the 4 doors? Are there all 4 16 speakers of the same type? -Can you just switch these 4 speakers or have to lower the door panels? If so, how does it work without damaging anything? -Where do I go best with the power cable from the battery to the interior for the amplifier and where do you put it at the leic? hstesten und besten? -Where do I get bulk in the trunk for the final stage? Thanks for your tips and support now! LG Peter