The EtherRegen’s PCB layout picture just grabbed my attention, and got me shaking my head in disbelief regarding claims about the device’s benefits.
It’s copper layout for all relevant devices, involved with the differential transmit/receive channels, violates their manufacturer’s design guides, which i.e. stress the need to keep corresponding pairs of Tx+/Tx- and Rx+/Rx- traces equally long and their impedances matched as closely as possible.
As executed in this glaring example of how to not do these things, electromagnetic interference has a much easier job of negatively influencing the workings, and simple signal isolation will never fix that problem.
OTOH, that may be the very reason, why it “sounds different”…
