Groovy! The iPod Classic is what I have (getting the iBasso DX90 soon). I recently Rockboxed it and was surprised how much more clear it sounds; unfortunately, it's a little sibilant and gives me a headache. I haven't attempted effectively working with the EQ. Just altering the basic bass and treble settings makes it sound too muffled/distorted.
A much more effective way of getting better sound.