Curious your speaker efficiency rating. I had a X350.5 once with 84 db Salks and it was nice but I thought the Wyred Class D was better. With the new .8's and XA's I am curious once again to try another Pass amp but with 93 db now I always wondered if an X30 would be enough juice.
BRM,
Unless your Exotica 3s are wired differently than mine, you can't use any of the Pass amplifiers with them. With the way that the Pass Lab amplifier function, they are "live" on both the positive and negative leads. The Rythmik amplifier needs to see a ground connection, or else it is open to damage.
This was verified with both Brian Ding and Jim. If you have the standard connection of the Exotica 3s, with the main amplifier providing voltage to the sub amp, you can't use the Pass amplifiers.
It is a shame. I moved my Exotica 3s into my living room for HT, and have been using a Pass Labs XA30.8 with Daedalus speakers to fantastic results.