One possible fly in the ointment of the Innuous Zen products is that they seem to only come with hard drives for storage - no SSD. Unless you have a small library, Roon really needs an SSD to hold its database for performance reasons…
Yes and also the Innuous Zen has a j1900 process. Roon recommends at least an i3 for good performance.
Also a good point.
How about the Zenith MkII? This has a an SSD as standard but what about its processor, is it fast enough @agillis?
I really like the build and functionality of the Zenith, had a demo of one at the Melbourne HiFi show, they weren’t running Roon but the unit was fast enough with their software.
My HDPlex build will eventually be used as a media server for AV but just for fun I’m going to try and install ROCK on it (until I get a video card). Hope I didn’t infringe any copyright laws having the Roon logo engraved on the power button.
The Zenith MkII is also a j1800. Their software is based on squeezebox. This does not require much processing power. Roon Requires at least an i3.
I don’t think Roon will mind if you use their logo. Should be a good looking box!
as long as it’s for personal use, or one of the fair use cases, it’s fine by us 
very cool… did you 3d print that? you gotta explain how that came to be, and a better photo so we can understand the size! what’s it made of?
No I’m not Larry…no idea who that is either. But nice idea.
He is HDplex!
Thanks @danny, I am building a low power fan less HDPlex H5 https://www.hdplex.com server for personal use with Roon (among other things), Larry gives you the option of having the logo of your choice machined into the brushed aluminium power button, for a small additional fee. I HAD to go with the Roon logo as that will be its primary use. 
I am using an ASUS H270I motherboard with an Intel Core i7 7700, Samsung 960 EVO 250GB M.2 SSD and 8 GB Corsair Vengeance Ram and a 1TB Samsung 850 EVO SSD. I will add a graphics card later on.
Just for fun I am going to try to run ROCK on it to begin with.
This will give you a better idea of its size and what the finished unit will look like.
Damn, I have just noticed that the grain direction of the button doesn’t match the faceplate. I don’t think it will be an issue for Larry to sort out.
Innuos is capable of running also Roon Server. There are some limitations of course, that are all mentioned here:
http://www.innuos.com/en/go/installing-roon
Roon requires at least an i3 for optimal performance. You can run it on a slower processor but the user interface will be slower especially as you add more tracks. This can be a real problem when you use Tidal. It’s very easy to add 10K+ tracks to your collection with Tidal and this would not work well on a slow processor.
But a J1800 should be fine for a few thousand tracks or so.
I’m sure you know more about this than I do.
Anyway, it would be even better if someone from Roon team could comment more on this. I get a feeling that you just want to sell a sonicTransporter for me 
Brian spelt it out in a post more than two years ago, and there’s plenty more on hardware requirements in the Roon KB.
Actually I emailed Larry many moons ago (2010) about cases he was building back then…things have come a long way…now I know who he is again.
But the HDPlex cases are not NUC compatible.
Yes it’s a shame that his cases aren’t NUC compatible, if they were I think they would be a great fanless case for ROCK, especially the smaller range.
Thanks @Geoff_Coupe !
I have about 1300 albums and using only convolution (not upsampling), so I suppose something modest would work? Is there anything more specific information available on what does @brian mean about “very modest piece of hardware”? Would Innuos work?
I am currently running Roon Server on i7-6700K, multiple GPUs, SSDs etc and it works nicely. Roon takes only about 1-3% of the CPU power even when using upsampling and convolution in the same time, so I don’t need this much power. I would like to have a fanless solution.
I think you’d probably be OK with an Innuos with that size of library, but if you’re confident about DIY, you could build your own ROCK-based solution using the motherboard from an Intel NUC transplanted into an Akasa fanless enclosure. I’ve done this for my Roon server, and am very pleased with the result.
I used the i7 NUC but its slight overload for the Akasa Plato X case…tho the i5 is fine.
but that said I would guess the i5 NUC would be fine with no DSD upsampling and it probably doesnt even need to go in a fanless chassis.
what does you existing rig indicate for performance speed now?
An i5 won’t necessarily do 512 but it will do DSD without too much difficulty.
What I meant was that with convolution and DSD it might struggle…as all the DSP functions will comprise of additional load to any setup. Only trial and error will find the tipping point…but such additional loads will put heat demands into play and will ramp up fan speeds or cooling requirements when such higher demands are needed. Adding and analyzing new music for example is a big cpu load, albeit a transitory one.
An i5 won’t necessarily do 512 but it will do DSD without too much difficulty.
An i5 is defiantly no good for DSD512 upsampling. We recommend a full quad core i7 (not a dual core i7 NUC) for DSD512.
