Originally Posted By: a_ok2me
It's been calibrated via MCACC, so I wonder why it could be off.

Just as a test, try turning off the EQ portion of the MCACC settings. If the mic got a bad reading (possibly from interference from the cabinet), it could be heavily EQing some band, which would also result in a hollow sound.

Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris