My 1994 Explorer has a factory JBL stereo with a small subwoofer. It's the cassette version (single CD was a rare option), but was still pretty high end for the time. It is also chromium oxide tape compatible. I still have some tapes, and the sound quality in that truck is crystal clear. The subwoofer is worn out though and doesn't like a lot of bass. I'm hoping I can restore it, I really want to keep the original system.