Jeff Rowlands Amp and Dac vs. VAC amp and DAC


Hello, I am new to this forum but I have a question. I am trying to pair an amp + DAC with my Wilson Sabrinas. I have listened to Jeff Rowlands integrated with the Aeris DAC. And the VAC Sigma integrated with the Aeris DAC. Price is a factor and so is space. Does the 625 need a pre-amp? Any suggestions or thoughts? 
rinpoche
Wow, that was amazing. And in some broad sense I think I understand. Not the technical specificities, but the general theory you explained. I will remember that when I go to hear the 200 iq. I am a bit obsessed now, wanting it to be done — and just to be home listening, but it is a process and the results will be something I live with for a while to come, so patience here is a virtue. Thank you all, especially Al, for explaining and walking me through the intricacies of this exciting adventure. I hear you — LOL, no pun intended. 
rinpoche I would say Al's technical wizardry and completely correct explanation notwithstanding try each output tap until you find the one that sounds best to you. It's likely to be the one Al suggests but it may not be, we all have different ears. Have fun!
Hi everyone.
Never heard Wilsons though heard a lot of them.
Would LAMM pre/power plus some DAC beat both Rowland and VAC overall? LAMM hybrid power, I mean. What if it could?
Inna,
It's strictly subjective as to what combination of components someone would prefer to drive these or any  speakers. For instance I had a friend's Lamm push-pull tube amplifier in my system and I didn't care for it, my friend agreed. That's just us,  another listener could have the opposite impression or be somewhere in the middle. 

Best case scenario is that you must actually do some listening with audio components to come to a definitive conclusion.  Rinpoche is taking the right approach. 2nd factor is confidence in yourself and trusting what you hear. 
Charles, 
It’s strictly subjective as to what combination of components someone would prefer to drive these or any speakers.

Yes preference is 100% subjective.

But performance is not and can be measured.

Performance is key to the best sound possible IMHO though any sound might be preferred still.

Limitations with performance may take longer to discover as amp is asked to work harder over a period of time. Like putting a very good quality but  undersized engine in a performance vehicle.

Best sound over time usually occurs when components are not required to run harder than designed to and able to deliver the music with ease.