Hi Bob - I don't know details of a new ACT2.2 versus an upgrade. Sometimes CJ puts a little metallic 'sticker' on the back of upgraded units. Brent has a good ear and his reports have me very interested to learn the sonic differences. I can never truly imagine what an improved component will sound like until I hear it. Imo, the v.1 ACT2 is a a top-shelf linestage, so when CJ says it the v.2 offers "significantly improved dynamic impact and greater body and weight" along with "higher resolution", it certainly piques my interest. If you get the upgrade done, kindly report back. I'm saving up!
Cheers,
Tim