In article ,
says...
Do you know if there is any real
difference in sound quality between the 3.5mm line-in and cassette? I have
heard that there isn't much difference at all, but am sceptical.

Some cassette adaptors don't work with some players because of the way
the heads work in reverse on auto reverse.

I had one to use on a basic clarion Headunit with a goodmans CDwalkman.
you could hear the hiss/clicking of the cassette adaptor, something you
wouldn't hear from a half decent line-in. But it isn't bad. I've heard
of good results with FM modulators too, but it depends on the modulator,
I only managed to get it to a little hissy, other have gotten it ****
hot with the right modulator.
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The poster formerly known as Skodapilot.
http://www.bouncing-czechs.com