@nyev The Merason is 24/96 at the AES input. When I owned it I had an Innuos Zenith and fed it via USB. Since I never enabled Roon to upsample so I only fed it native resolutions. Regarding how it sounds with the Grimm MU1 at 2fs only, it will still sound good.
The Merason was suggested as a very solid, well executed, beautiful sounding dac for very reasonable money. It will give you a good idea of where on the performance bar your Gryphon dac board measures up. I suspect the MU1 will elevate the performance of your Gryphon dac via aes that you have yet to experience and the Merason dac will provide a very nice data point for comparison. IIRC the Merason runs dual mono with two dacs with true balanced outputs. Since the interconnects you’ve chosen exceed the $ value of the Merason, I also suspect that $3.5k-ish USD preowned invested in the Merason dac and the $5k-ish USD retail Shunyata interconnects will prove to be a less attractive value proposition than your Gryphon dac. (Subtle, tongue in cheek poke at you there haha) But this exercise should tell you alot. You can set the Grimm up as your roon core, attach the wonderful Shunyata Omega (v1 or v2?) AES/EBU cable to your Gryphon dac and you will hear all your Gryphon dac is capable of. You could also configure your Innuos as an endpoint feeding your phoenix and then via usb to your Gryphon dac and switch between the two streams conveniently.
Did I roll my eyes???? Yeah, I have to be honest I did a little bit LOL.
At the end of the day, try not to get too hung up on bit rates and focus on the sound. I predict that your opinion of your Gryphon dac will spike once you’ve heard it with the Grimm once its well run in. There are many roads to happiness with this exercise. Are there even higher performing solutions? Of course…for me, my system and my ears I found the Grimm to be first class experience for frequent flyer miles money. Let me clearly state though and you already know my feelings…dropping in $10kish USD of cables on the two sides of the Merason leaves me with heartburn although its your party, you get to design the menu.