We'll get a chance to test triple-stacking SOtM twins + Melco S100 by the end of this month, or maybe next month due to Chinese New Year. Most likely we could get a closer look at where law of diminishing returns would actually kick in by comparing the differences between twins and triplets.
One of CKKeung's buddies also happened to be an owner of SGM Extreme and supposedly it's the best music server out there at the moment. If we're able to bring those twins / triplets there to do a comparison, then we'll have an opportunity to witness if those switches were playing an important role or otherwise. Emile is also testing SGM Extreme with Telegärtner M12 Switch Gold / SOtM twins / ER and let's see how it goes.
On the flip side, an owner of the Chord HMS + DAVE combo (same as romaz with SGM Extreme?) purchased his Melco S100 recently while his entry-level streamer with Toslink output turned out to be Yamaha NP-S303
https://review.kakaku.com/review/K0001204484/
It's written in Japanese so machine translation could still give us a better idea about what's being written, then I found that NP-S303 streamer should cost less than £300 and it's directly connected to his Melco N1A music server at first
https://pricespy.co.uk/audio-video/media-players/yamaha-np-s303--p4421780
He also tested £3,600 dCS Network Bridge as well as £9,500 Esoteric N-03T (prior to his Melco S100 purchase) but neither one seemed to float his boat given their costs, finally Melco S100 resulted in HUGE improvements when it's added between his N1A server and NP-S303 streamer.
Basically those DACs from Chord / PS Audio etc. should be well known to be jitter-agnostic while Toslink outputs of streamers are able to provide galvanic isolation, therefore Melco S100 must be doing something right or else the "worst" Toslink output of such a humble streamer from Yamaha wouldn't sound so much better.
Though I'd like to mention that even relatively affordable sources with Toslink outputs do work exceptionally well for Chord DACs, romaz also shared a comparison between his ~$2K modified Oppo UDP-205 and >$10K Innuos ZENith SE + Mutec REF10 + SOtM tX-USBultra trifecta back in Mar 2018
https://www.head-fi.org/threads/rev...phile-vortex-box.787020/page-78#post-14117821
Finally I also wanna point out that music servers / streamers are almost always connected to switches / routers (for the sake of remote control from mobile devices) even though we're ONLY accessing the entire music library via SATA / USB / Thunderbolt / Firewire drives that are directly connected, it's mighty interesting to learn that LAN isolators still worked despite the fact that only local drives were involved
https://www.hiendy.com/hififorum/forum.php?mod=viewthread&tid=131063&page=1#pid2970961
http://jplay.eu/forum/index.php?/topic/3019-net-isolator/#entry49193
One could only speculate what switches were able to bring to the table, though romaz already provided some hints here regarding the isolation etc.
https://audiophilestyle.com/forums/...reaming/page/414/?tab=comments#comment-893173