Sonore microrendu not recognized by Roon (ref#821JU8)

Support
1

What’s happening?

· I'm having trouble connecting to Roon

What type of connection issue?

· Something else

How can we help?

· None of the above

Other options

· Other

Describe the issue

Sonore microrendu not being seen by roon

Describe your network setup

Optus nbn home network, microrendu is connected via ethernet cable to roon server

2

Ok so this is weird. Sonicorbiter can see the microrendu, connected to dac via usb (see screenshot). However roon cant see microrendu. The weird thing is, i have a usb-optical converter, and when i connect the microrendu to that, so then have a microrendu-usb-toslink-dac connection, everything works and roon can see microrendu. Ie the problem only exists on usb connection, even when the optical connection itself is derived from usb.

3

Hello @john_smith3,

Thank you for the update — and the behaviour you’re seeing actually makes sense once we look at how the microRendu is certified.

Your Sonore microRendu is Roon Ready only as a network endpoint (RAAT over Ethernet).
That’s the certified and supported mode:

When you use it in this mode, Roon talks directly to the microRendu via RAAT, and the device is expected to show up automatically.

If Roon doesn’t see the microRendu in this configuration, it means the USB chain is failing at the OS/driver level inside the microRendu**, before Roon is even involved.

Roon cannot enumerate a USB DAC behind the microRendu unless:

  • the microRendu OS detects it,
  • loads the correct USB audio class driver,
  • and exposes the audio output to RAAT.

If the Sonicorbiter UI shows the DAC but Roon does not, this still indicates the issue is below Roon — the microRendu is not presenting a stable RAAT-capable audio endpoint when that specific DAC is connected over USB.

MicroRendu is Roon Ready only as a network device; any other type of connection does not guarantee availability in Roon as a Roon Ready device.

4

Ok thanks. But im not sure this explains why roon CAN see the microrendu when it is connected to the dac via a usb-toslink converter?

Also, is there a fix for the usb connection? Toslink is obviously limited compared with usb as a link to the dac.

5

Bump…is there any solution to this issue?

6

Hi @john_smith3,

Thanks for the update. It could very well be the case that because the USB–Toslink converter is acting as a simple, standard USB audio device, while your DAC’s direct USB input is acting as a complex or non-standard USB device.

The microRendu’s operating system can handle the simple one, but it struggles to correctly support the DAC’s native USB input.

If the microRendu can’t properly load the USB audio driver for your DAC, it can’t expose it to Roon, so Roon can’t see it.

That’s why inserting the USB–optical converter (which is extremely generic and class-compliant) suddenly makes everything work.

There can be, it depends on the DAC. The root problem is that your DAC’s USB implementation isn’t playing nicely with the microRendu’s Linux USB stack.

A few areas you can explore further:

  1. Update the DAC’s firmware
  2. Change USB modes on the DAC (if available)
  3. Try a different USB cable or port
  4. Check with Sonore support - ask Sonore whether your DAC has known compatibility issues.
7

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