09-27-2008 02:12 PM
Well first off it is not a dumb question at all.
Now to business. when replacing your radio and speakers you do not HAVE to install a amp for the speakers. Some people prefer a amp for the interior speakders becuase it will give you better sound quality and make the audio louder.
If you do not mind me asking what is the year, make and model car you are looking to get stuff installed into? Also the reason you would like to change these products in your car.
I might be able to give you some more indepth answers with this info.