... he would like to take a cassette out to his pickup to "hear what its going to sound like".Exactly right. In college, we'd mix on small Auratone speakers that were designed to mimic car stereo speakers, even though the studio was equipped with top-of-the-line JBL studio monitors.
Oakleys (Answers | This Thread)
Later, when I was supervising edit sessions at a television network, we occasionally played the mix through Auratone speakers to hear how it'd sound at home on one's TV.

