The 248 has a slight HF boost and if you go past 3/4 way on the gain it becomes VERY pronounced.
I've run the m248 with gain 1/2 way with fine results, I would try to not go much more than 1/2 open
though. I'd calibrate the MME to the m248 with the oade at about 1/4 gain at home and adjust the
oade at the show from that point.
callery