I have a '95 C4 that came with an AM/FM/Cassette stereo. I found the CD version on Ebay (AM/FM/Casette/CD) and bought it. But I never stopped to think about the Bose/Non-Bose aspect of things and think I may have jumped the gun a bit in buying the Ebay unit.

So my question is - how can I easily ID whether the existing installation is Bose or not?