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
rinpoche if you are soliciting opinions on Tidal then I will weigh in as loving it. I think the sound quality is excellent for the most part one thing to keep in mind though is the source they are using, i.e. some are remasters some are not, some were recorded well, some were not. But I think it sounds as good as CD's that I've ripped and stream, and its tough to beat the selection. I listen daily and love it. The one thing Tidal doesn't have yet is high rez, that may or may not be coming down the road.
I concur with jond. In many cases the sound quality fom Tidal equals the qualitiesof CD's that I've ripped. It depends on the original recording. 
I have listened to my files vs. Tidal files and I find there is a difference. Can't beat the selection -- I agree. And I do use HD Tidal. 

What do you think about music centers such as Audirvana and others? 
Audirvana is quite good....and simple which is worth a lot.  There is also an ios app you can use to control Audirvana via a iPad or iPhone. 

Regarding servers, the Aurenders are supposed to be great, but in terms of value, although they are optimized for audio, you are essentially buying a computer. You also need another "real" computer to interface with the Aurender and rip your CD's to etc..  Plus you may need a NAS to actually store your music on.

I am using a Mac Mini as a server.  It is connected to an external hard drive via firewire.  The mini has a solid state drive and is optimized for audio, and runs Audirvana.  It also has a CD drive so you can directly rip your cd's to a digital library (the Aurender products don't.)  A monitor is needed for initial setup, but after that you can run the mini and Audirvana headless via an iPad on your wifi network.  Super convenient, and you can put together a nice server for about $1200.  From the server you would use USB into your dac just like you are doing from your laptop.  

As with everything audio, I'm sure there is some sonic benefit from using a dedicated product like Aurender, but the sound coming from an optimized mac mini is great.....plus, it is something you can work on and modify yourself.
I very much like the idea of a mac mini to the DAC and an ipad to navigate. That sounds optimum to me. I will look into it. If I have any questions, I will get back to you on this. Thanks. E