I understand that Roon now supports multichannel, but I’ve yet to see anyone mention what hardware supports multichannel. Can anyone point me to some options that I can investigate?
I have the full range of multichannel options from the HDMI output of an Odroid C2. Direct from a NUC running ROCK I only have 2.0.
@Henry_McLeod, which distribution are you using with the C2? So far I’ve been unsuccessful with multichannel on the Odroid…
I have an Intel NUC7i5BNH (actually with the motherboard transplanted into an Akasa fanless case). It’s running ROCK, and I get a 7.1 multichannel connection with my Denon 3808 AVR via the HDMI connector.
I use DietPi on the C2 running nothing but Roon Bridge. However it does expose the full 5.1/7.1 capability in the drop down menus during config. I do not get that running ROCK on a 5i5MYBE but that is the board with twin display port sockets, no HDMI. In hindsight that may be the reason.
That’s interesting, @Henry_McLeod. I tried that last week and Roon was throwing errors both in 5.1 and 7.1 configuration. Any chance you can run an
uname -a for me, so that I know if I am running on the same kernel version?
Will do when I get home.
This sounds very intriguing and an excellent solution! A couple of questions, if you don’t mind:
- Are there any resolution/sampling rate limitations on the HDMI connection?
- Do you store files on the NUC or on a separate NAS somewhere? (I’m told it’s not advisable to store files on the NUC for some reason, but I’m not sure I understand why?)
My current settings are shown below. Because the Denon does not support DSD format, I’m using the “convert to PCM” option. I’ve also set an upper limit on the PCM sample rate and the bits per sample, because the defaults didn’t seem to work. These could be raised further, I think, but I haven’t bothered to do much experimenting.
At the moment, the music files are stored on a separate server running Windows 10 Pro. This server is used to hold other media files for the home cinema setup.
The Roon Core system in the Akasa case does actually have an internal 1TB drive installed, and I will get around to using this once more for the music files (as I originally did when it was in a previous generation NUC using Roon Server running under Windows 10 Pro). I just haven’t completed the move across to the new ROCK-based system as yet.
Not sure why you’ve been told it’s not advisable to store files on the NUC, I see no reason not to.
My DSD files are stored on my NUC. My PCM files are on a NAS. There are no ill effects, DSD sounds as it should and I don’t have the burden of big DSD files transiting my network.
Thanks much Geoff. You too Henry! Boris - any luck with the Odroid? Or maybe you’ll try straight out of the NUC as well? …I think I’ll give the HDMI from the NUC a try myself, unless someone has a better suggestion! (I don’t really see any drawbacks with this solution, however. It’s a lot less expensive than even the cheap options that Kal Rubinson has been reviewing!)
Did you have any chance to look at the kernel version, @Henry_McLeod?
root@DietPi:~# uname -a
Linux DietPi 3.14.79+ #1 SMP PREEMPT Tue Feb 7 19:57:43 CET 2017 aarch64 GNU/Linux
weird. that sounds familiar. will need to give it another try then.
Do you have any special settings @Henry_McLeod? I am running the same here, and I get
in Roon. In
RAATServer_log.txt I get
Error: [RAAT::ODROID-HDMI] error in failed to snd_pcm_hw_params_set_channels exactly. trying to set max channels instead: Invalid argument (-22)
Error: [RAAT::ODROID-HDMI] error in snd_pcm_set_chmap: No such device or address (-6)
Can you also run an
aplay -l for me, @Henry_McLeod? I am getting
**** List of PLAYBACK Hardware Devices ****
card 0: ODROIDHDMI [ODROID-HDMI], device 0: I2S dit-hifi-0 
Subdevice #0: subdevice #0
HDMI 2.0 exceptions may exist, but as a general rule of thumb, HDMI supports up to 24 bit 192 kHz PCM and 2.8224 MHz DSD (DSD64). On the DSD front, many A/V components support native DSD input/output via HDMI, while many computers do not. Computers may support DoP DSD output via HDMI, while A/V components do not. Best practices for HDMI, thus, are to use PCM and cap sampling rates or upsampling to 24 bit 192 kHz.
I was wondering if there has been any further development in using Odroid C2 / dietpi / roonbridge PCM muiltichannel into an AV receiver (in my case that would be an Onkyo PR-SC5507 and a Primare SPA23). Can anyone confirm this works?