Kal,
I've always assumed DRC stands for Digital Room Correction.
OP,
it's been some time since I set up my SMS-1, but I think you can just let it run if you don't care to see what it's doing. Although I may have the display turned off, IIRC it does have a display that shows what state it's in. Still, it's fun to watch the changes in correction as it makes its passes, so hook it up to a monitor or TV.
db