i have an 85 eldo convertible. i want to upgrade the speakers and the amp but i don't want to lose the factory look. can i just have some kind of hidden amp with a headphone jack input so i can play my ipod thru the amp? or maybe headphone to rca jacks? i'm not worried about am/fm just my mp3's any help would be great

Optional Information:
1985 Cadillac eldorado ht4100

Already Tried:
fm modulator cassette adapter