Ok things all SEEM to be set up correctly (remember this has been running fine for some time now)...and I did reset the 950.
but even playing Dr Chesky's SACD which has a whole lot of LFE and listening to the LFE sections alone...there is almost nothing coming through the sub. Enough that it turns on as it recognizes a signal but nothing to speak of (or hear). Have sub volume truned up all the way too and it has never been past a hair beyond 1/2 way.
Can't figure out how to trouble shoot whether it is Supercube or 950 problem