Mutec MC-3+ USB

[SwissBear]

Can only guess at this stage.
But if you compare the price of MC-3+ USB to competition, you can infer that the business model of Mutec is to bring state of the art technology from the studio industry, which is probably much more cost minded, to the audiophile business, where prices are often a second or third order variable. If this proves right, we can expect this product to be priced much less than competition which is, if I recall my readings correctly, around 10'000 USD for a clock addition to a high end DAC.
One thing will be to make sure that the feeding of a 10 MHz clocking signal to MC-3+ USB will bring more sound clarity/spatiality to the Devialet, even though we are not able to send a clock signal to the internal DAC of the said Devialet. We will have to listen to before confirming the pertinence of this track...

How about enabling digital out on the Devialet and connect this back to the Mutec as clock reference, but still use the superior clocking in the Mutec? Would this work?

Not sure, but what I understand from this complicated matter, is that you need to have a very precise clock in order to improve the quality of the signal (remove jitter and noise). You might be able to use the digital output of the Devialet and feed it into the Mutec (MC-3+ USB) as external clock, but you will then not benefit from any 10 MHz clock input (you can only have one master clock).