I am amazed that these do in fact sound differently than generic SFP transceivers for audio applications. Not even sure how that is possible but I am glad I gave them a try. I used the first pair between a fiber switch and an Uptone Audio EtherRegen (switch/media converter). And I have ordered a 2nd pair to use between an Intel NUC running Roon ROCK and a Sonore opticalModule (media converter). I can't recommend these enough!