I'm keeping the input gain at 11am. Master volume to taste, although like I said never had to go above noon on that.
My main bass is a lakland Bob Glaub, which is passive. Other basses I've used with this set up are - Nash JB63, Lakland DJ, Fender P bass and Jazz.
all are passive. The Lakland DJ has the hottest output, the jazz has the quietest output. They are all passive, so I can't compare the outputs to how hot a signal an active bass may have.
Using these basses with that amp input gain, the OD light on the mesa only occasionally turns on.