One sub. The ongoing wisdom has been that if you have a dedicated means of EQ'ing the sub: SMS, Velodyne DD, AS-EQ1, RABOS, etc; use that first, then use Audyssey over top of that. A lot of people have expressed that they get better results that way than just with Audyssey alone.

So now with two subs, Audyssey can do a better job alone w/o first EQ'ing each sub individually? When EQ'ing two subs together is a lot more difficult than one sub by itself ... specifically due to their interaction?

If each sub is EQ'ed individually first, Audyssey is given a more uniform response to start with, to then EQ the combined response.