In reply to:

And how silly am I? I actually carry a self-made demo disc around in my car....you know, just in case I happen to pass any audio stores and need a quick audition.

I'm triple silly then... I carry a disc of subjective listening material, an audio reference disc (snagged from one of the CBC Radio guys) and a low-frequency reference/subjective listening disc (since the radio disc doesn't specifically reach down to those subsonic levels).

Bren R.