Hi Jonny,
Firstly, a disclaimer. Until July 2015 I listened to CDs, vinyl and tape. For digital I used an ancient Cambridge DacMagic 2 (iia) with many modifications and a Zapfilter output. Then, on the recommendation of another enthusiast, I got the Auralic Vega. Suddenly I had a genuine soundstage and I was hooked.
However, I have only been looking at digital audio for about five minutes, compared to the experience of others on the forums (and, of course, the devs). I’ve learned a lot since June, forgotten most of it and continue to get things wrong all the time (probably will until they put me in a pine box). So please take anything I say with a huge grain of salt. I’ll set out for you the factors I am taking into account myself looking forward, and then try to relate that back to your gear.
As you say getting noisy general purpose computers away from the hifi is at the heart of architectural considerations. Commonly this is done by having a “noisy side” and a “clean side” and having no electrical (or galvanic as people say for some reason) connection between the two. My preference for that connection would be Wi-Fi, Ethernet and Toslink (in that order). Others would leave out Wi-Fi (I’ll come back to that later). Toslink won’t do DSD (more later) so that leaves Ethernet. Ethernet is a wire but it is transformer coupled at each end meaning the signal crosses a magnetic gap. I understand, however, that there is a common earth connection, which can still carry noise (hence my preference for Wi-Fi). Ethernet is, however, a much better connection than USB or coaxial when it comes to separating the noisy side from the clean side. Also a 15 foot run of Ethernet is very likely to be indistinguishable from a 3 feet. The same can’t be said for USB.
There are also three things I want to be able to do looking forward that will affect my architecture choices:
Firstly, I want to use HQPlayer with Roon. I bought a licence recently after trying it out earlier in the year and am enjoying it immensely. The way HQP integration will work with Roon, however, means that I will have to either connect the Core to my DAC by USB or use a Network Audio Adapter (NAA) which is a lightweight program recognised as a network connection by HQP.
Secondly, I want to explore real time room EQ. Again, HQPlayer will let me do that with it’s convolution engine.
Thirdly, I want to explore MQA. Tidal are going to start streaming it in 2016 and both Tidal and Roon have indicated they will develop software decoders. I have not seen anything about how MQA will interact with HQP. It may be that I will be able to decode MQA in Roon and feed HQP a native 192 kHz signal. It may be that will interfere with the <10ms timing resolution that MQA promises. That all remains to be seen.
Taking all the above into account I have three options:
- Use a preconfigured WiFi/Ethernet bridge to connect to my DAC;
- Build my own lightweight streamer to connect to my DAC;
- Connect the Core to the DAC.
So far as 1 goes I have an Auralic Aries and had been hanging out for it to become RoonReady. Now, however, I need it to be an NAA if I want to use Roon/HQP and have a WiFi connection to the Aries. That would be a really great solution for me and I think something that could be relatively easily implemented in the Aries. Unfortunately, however, after making enquiry of Auralic it appears they don’t plan to include an NAA in Lightning DS any time soon. That means finding another hardware solution. The Sonore uRendu looks most interesting. Ethernet, RoonReady and NAA. I think we will see more devices in this space.
As regards 2, I would be interested in a linux capable small thermal profile computing device that could operate off a 5v battery supply and run RoonSpeakers and the NAA daemon, receive Ethernet or Wi-Fi DSD 128 and output it to the DAC. A Raspberry Pi box might be interesting here. From experience, however, I know it would take a heap of mistakes on my part before I got something like that working.
Number 3 is what I am currently doing and it doesn’t comply with the clean/dirty architecture I described at the start. However, it is currently sounding great ! I just experimented with a battery powering the BRIX instead of it’s switching power supply. I didn’t hear a difference, so it’s unlikely I will put myself to the inconvenience of changing the battery every 2 hours or so. What I will do, however, is put the BRIX closer to the DAC and use a Mapleshade 1m USB cable. That will mean putting a switching power supply closer to the hi-fi, but there will be various power conditioners between it and the DAC or amp power supplies.
Now in your case, I would ordinarily have been a big rap for the Aries, and I think the Aries Mini will also be interesting (@scolley will be checking out the Mini for us all when it becomes RoonReady). But if you were to tryout HQPlayer (and I would recommend it) and find you like it, then the Aries is not currently viable as a streaming connection from HQP and you will be in the same boat I find myself.
I’m a tube guy, so I don’t go in for DAC/amp combinations. I’m loving the Vega and it’s going to take a lot to pry it from my cold dead hands. You may, however, find a combined DAC/Amp that ticks your 7.1 boxes. I would definitely suggest checking that the manufacturer releases firmware upgrades and has a plan to be RoonReady.
Roon is, I think, for anyone who wants to explore music, particularly with a Tidal subscription. In a years time I suspect it will be hard to find a new device that isn’t RoonReady.
I hope the above is of some assistance. Personally I won’t be making any further gear decisions until I find out more about how MQA is going to fit in with Tidal, Roon and HQP.