Jeff Rowlands Amp and Dac vs. VAC amp and DAC

The tap discussion is way above my head but I am writing it down and when I go to the shop to hear the VAC 200 iq system I will ask about it. If the VAC 200 iq is one of the winners, and I get to bring it home to try with the Wilson's -- I will report back on the combo for sure. But, if I hear you both correctly, the 8 tap is possibly the one to try first? Then the 4?

Also, from what I understand, the JR amp doesn't need anything like this, right? It just needs to be adjusted via the Aeris according to the manual.

I am happy to hear there are fans of the JR 625S2/Aeris combination. And VAC lovers as well. At least I know I am in the right zone. Thanks

Rinpoche,
The "taps" are what you connect the speaker cables to on the rear of the amplifier. They are clearly labeled as 2 ohms,4 ohms, 8 ohms etc.  The taps are in plain view. You'll have to listen to the different amplifier tap settings and just choose the one that sounds best to you. I'm glad you are enjoying this experience. 
Charles, 

You are correct. there are no speakers impedance adjustments in the Rowland M625 S2... Its output taps are expected to work for all common speaker varieties.

If you connect Aeris to M625 S2 directly, use the Aeris remote for setting volume at your preferred level. If there is a linestage between Aeris and M625, Set Aeris gain to unity/unattenuated... Solid right volume LED lit up, and then use the linestage to set listening level.

Bear in mind that results have a lot to do with the degree of break in of the devices you are testing.

Regards, G.

For now the 625 S2 would be connected directly to the Aeris. Same with the VAC. However, and I do hesitate to throw some other amps into the discussion, but what do you feel about Dan A'gostino The Classic Amp? Is that a crazy alternative? Too much for the little Sabrinas?