Pre-fiber converter, I recommend the Blue Jeans cat6a cable because the shields aren't connected to the connectors and this could theoretically prevent noise downstream.
I recently tried the BJC cable and it was an improvement over another completely unshielded ethernet cable I was using (as well as various shielded varieties). I've tried a bunch of cables in the upstream part of my network, before conversion to fiber.
I also seem to have gotten better sound from an inexpensive Trendnet switch with an SFP slot vs a Startech media converter for whatever reason, too. So if something still seems off, you might consider comparing your media converter to a switch.
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Christian
south: Mark Levinson No. 52 pre, Bricasti M28 amps, Lumin A1, Oppo BDP-205, Pioneer CT-43, Sony SS-AR1 Speakers, Audioquest Dragon PCs, Audioquest speaker cables, Audioquest interconnects, HB Power Design Powerslave Star Galaxy power distributor
north: Vitus SIA-030, Luxman D10X, Sony TC-KA3ES, Harbeth 40.2, Siltech cables
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