SOP- I finally "matched levels" with Avia on the 45a analog outputs. I didn't have a problem with the sub. It is lower, but I could still get it to match the other channels. For example, on the 950, I have all levels within a dB or 2 of 0 (not "referenced", just "levelled"), and my sub ends up at -3 dB. On the 45a, I had to put the sub at + 2 dB to match the rest of the channels. Maybe there's more than 1 iteration out there.

Yeah, I gots to get me my own DVD-A test disc...