Plugging in the USB cable things change and all resolutions open up but I’m still streaming to the iDSD as a Roon endpoint using the Roon desktop app

It would seem you are somewhat correct. I am not using airplay because there’s no wifi connection setup but it must be using AirPlay even though I’m on a Windows PC not a OSX device and I am indeed limited to 44khz using the iDSD as a Roon endpoint with ethernet cable only.

Ok let’s put this to rest once and for all. Let me fire up my iDSD and check max resolution

I think you're putting too much emphasis on "Roon Ready" and "Roon Tested" certifications. Plenty of examples online of devices that are not "certified" but work fine with Roon. Just because it's not certified as Roon Ready or Tested doesn't mean a device won't work with Roon. As I said, the...

Roon 100% works with the iFi iDSD Pro. I'm streaming using Roon as I'm typing this and I pulled my USB cable out on purpose. It's running straight off my ethernet cable with no WiFi connection as a Roon endpoint. Works flawlessly but mine is the latest Signature version so can't speak for...

It's 3rd party but Roon can do everything you're asking for. I'm streaming directly from my NAS and streaming using my Tidal and Qobuz subscriptions.

Don't know what to tell you. All I had was a ethernet cable connected running Roon desktop client on my desktop PC with WiFi off. I have a Roon Core server and a NAS with subs to Tidal and Qobuz. All worked beautifully with no USB cable connected. In fact, I was only able to use the iDSD pro...

Can confirm it does connect with Ethernet. I used it for a few days as Roon endpoint without USB cable plugged in because I was having issues with driver install.

Works as Roon endpoint without issues. Does MQA hardware decoding with Tidal, Qobuz streaming, and streaming from my NAS all the way up to DSD all through the Roon desktop and phone app.

TT2 and M Scaler just got picked up by FedEx 5 minutes ago :beyersmile:

Not so shameless comment about the Pro iDSD. It's a fantastic unit, I just replaced my Chord TT2 and M Scaler with the Pro iDSD Signature and Pro iCAN Signature stack. Leaps and bounds better with any headphone I try. Being able to switch from SS to tube is a huge plus as well. Works as a...

I have a iDSD Pro signature and iCAN Pro signature.... any benefit to using the iGalvanic and iUSB 3.0 on the USB input or can I just go direct?

Thanks for the suggestions gents, looking into all of them. Picked up a Primaluna Evo 400 with some cryo treated KT150 tubes and NOS Gold Lions for the pre stage, overkill for headphones but had to do it. LOL! Surprised nobody has mentioned the Brinkman DAC

Good evening gents. I've come as far as I can come in the headphone game. I currently own: Audeze LCD4 Audeze LCD4Z Abyss Diana Phi Focal Utopia Meze Empyrean Sennheiser HD800S Currently using Chord Hugo TT2 with M scaler I've tried: Yggdrasil (analog 2)/Ragnarok Mytek Manhattan 2 DAC/amp...

As already mentioned have you tried turning off the ground switches? That solved my issues.