I have had my unit for a few weeks now.
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Marcin also included a DC lead to be able to allow me to power it from a 12V rail from my DR SR7:
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Emile also sent me my dual SOtM sNH-10G switches back to allow me a much more comprehensive evaluation of various switches. This has been the first time I have heard the SOtM switches with my Extreme:
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Emile was kind enough to provide me an OCC copper and hybrid silver/gold DC lead to compare against the OCC silver lead that were in my SOtM switches:
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What is interesting is that what applies to my other servers is not guaranteed to apply to the SGM Extreme and so this is why I felt it best to post here rather than elsewhere.
For example, even now, with my servers other than the Extreme, I prefer the SOtM sNH-10G to the etherREGEN by a fairly large margin and dual sNH-10G remains better than just one. With the Extreme, the SOtM switch sound too thin and less natural, even with the copper or silver/gold DC cabling and adding the 2nd sNH-10G fails to rescue it. With the Extreme, I prefer the etherREGEN's greater body and tone.
With my servers other than the Extreme, I prefer the etherREGEN's "B" side. With the Extreme, I prefer "A" side only.
With my servers other than the Extreme, I really don't prefer the etherREGEN at all and it basically goes unused. With the Extreme, functioning largely as an FMC, I love what the etherREGEN adds although admittedly, I have not yet tried Sonore's OM to compare against. I also have not yet tried the new Melco S100 switch but I hope to receive one shortly for comparative evaluation. Powered by a DR rail from my SR7, the etherREGEN (A-side only) is extremely dynamic, has excellent body, and a liquid tone.
With my servers other than the Extreme, I prefer copper direct to server over SFP by a fairly large margin. With the Extreme, I prefer SFP direct to Extreme over copper by a small margin. I find the noise floor to be lower and resolution to be higher with SFP direct to Extreme but the caveat is that the preceding switches, router, and modem sound best with copper. I agree with Emile here, fiber needs to be in the chain somewhere. I also agree with
@CKKeung that copper needs to be in the chain somewhere. A mix of both is ideal and the order isn't necessarily as important.
As for the M12 Gold, this is easily the best switch that I have heard thus far, especially when powered by my SR7 but even when powered by the stock SMPS, it still sounds very good and is better than the others. Powered properly, the etherREGEN sounds more dynamic but the M12 Gold adds something that is unique that no other switch has been able to provide in my system. The M12 provides this relaxed, non-fatiguing, "listen all day long" immersive quality that cannot be adequately described in words. Its qualities do not immediately grab your attention but when you remove this switch from the chain, it results in a bigger letdown than removing any of the other switches I have. If your system borders on the analytical or if musicality is the ultimate goal, this is the switch to get.
As for stacking network devices, unfortunately, this makes a difference with the Extreme because each one can add something unique to the balance that one might be after. It goes without saying that a good power supply to any of these devices makes a significant difference. The SB8200 modem ($160) is incredible in terms of the clarity it provides. The impact of this modem is significant and makes a bigger difference than the router in my system. The EdgeRouter X SFP ($100) provides clarity but also a very appealing density to the sound. The performance for the dollar of these 2 items are very high. The etherREGEN with the inexpensive MGB-TLX SFPs provides dynamics and liveliness. The M12 Gold provides beauty and musicality that ties everything together. As for network cabling, they continue to make a very significant difference. It's hard to remove any one of these items from my chain. Yes, addressing the network can be viewed as tuning for taste or "tweaking" but imo, no different than selecting a power cord, USB cable, or footers. As always, YMMV.