I've tried the lot - Jupiter Jacks to the fm adaptors with my Sony that came with my 2001 Bambi - it had a sony epuipped with a cassette player (anyone remember cassettes?) - none of them were satisfactory really - jupiter jacks are meant more for phone calls, so the sound was pretty awful - ended up yanking the old player out and replacing it with a CD/ipod player for pretty cheap - and replaced the speakers at the same time - all for less than $100.00 - just be patient for the right deal. The sound is really, really, really nice in the little Bambi now . . . next project: replace the antennae on the roof with a Winegard satellite dish . . . I know, don't say anything!