before i tell you wrong, let me double check my manual when i get home.. but, i know its not the regular calibration volume setting.. its a different 'mode' that allows you to increase the center channel volume temporarily.. then, once you turn the unit off, it defaults back to what you have it calibrated at..

i have this on my 701, and just assumed you would have it on the 601.. i will check my manual when i get home this evening, and give more details..

bigjohn



EXCUSE ME, ARE YOU THE SINGING BUSH??