I've tried it that way - 4g router with FMC. It was a little bit better... without FMCYes, using 4G that's understandable that using a wireless protocol will be better, this is comparable to using a wi-fi extender to separate the dirty router end from the audio clean switch end and is more beneficial than just FMC alone, using a FMC on the clean side from switch to DAC gives an improvement with less hash and noise so more resolution overall. Why not try you internal network with a wi-fi extender and then FMC? Try to get that router with all your data traffic out of the equation.....
FMCs have their own distortions because of poor internal clocks.
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