Once again today extremely disappointed in mbl, the worst I've heard them sound. Open reel tape sounded like mp3. And apparently I wasn't the only one, Mikey Fremer left after 1 (yes, that's one) minute.
I really haven't noticed the source correlation Sam has. Plenty of LP's sounded bad, lots of server/DACs, even playing Red Book, sounded really good. Even tape (in the mbl room) could sound not so hot. In fact two of my better sounding rooms, Light Harmonic and Nordost, had no analog sources. Room size was definitely an issue, though, the bigger definitely the better.