Did you ever figure it out? I am having the same issue with an original black cube mated to a technics sl1500m2 with a grado gold. I have it set to the MM settings and its a descent sound, but you really have to crank the volume. I'm not use to that seems to loose some punch as well I think when ran that way. I haven't been into vinyl in years so it's sort of new to me. I didn't care about cartridges back in the day just good music.