Indiana Jones would be antsy
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Are you talking about the Sonore OpticalModule?
Until you have intimate knowledge of a person’s home electrical system, never recommend a cheater plug (unless you have a good lawyer)
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Your cables are world-class Twister champions.
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I believe I am. Yes.
Lifting the ground in unit is no big deal. My Muse mono blocks came with instructions to use a cheater plug if there is noise generated from the grounding system. My Bruce Moore preamp came with the ground wire unattached. Most of my mid-fi component are two prong (no ground). Unless you start opening the units and messing with the circuits and wiring, nothing is going to happen.
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I say that you can justify anything to anybody at any time - especially to yourself. It is one of life’s greater truths.
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Haha. Right. This is all opinion. Truths?? Lol
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I strongly suspect that would be illegal to sell in the UK.
I hope so anyway 
I do not have a dog in this hunt, as I sold my DS Sr. and Matrix some months ago, but for the record, running a Matrix between an Auralic Aries G2 and a DS Sr. made a meaningful audible improvement in my system. Also, the person to whom I sold my Matrix runs it between an Aries G2 and a DS Sr. (FWIW, his speakers retail for roughly 30x the price of mine.)
If we start with the notion that the DS’s I2S input sounds better than its USB input, then it tends to follow that the Matrix should improve the sound of all USB-based sources. (Or, put differently, the Matrix arguably sounds better converting USB to I2S externally than the DS sounds doing the conversion internally.) Please don’t take my word for it, though. See Posts 1375-76, above.
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Why do you need it as the ER already has an optical port? Doesn’t the ER do the same thing?
Think about the other end, the router end. Do you know of any consumer grade routers with optical outputs?
There are plenty of them. Mikrotik have a good rep although I haven’t used them myself.
In theory, the ER should provide the equivalent isolation though.
Sigh.
Not if it is double insulated, I think
Note - this router seems to be indicating the sfp cage is on the “input” to the router (i.e. internet).
May be possible to configure in other ways, but it is quite possible (likely?) that the router is hard coded to NAT from the “internet” ports to the “LAN” ports and hence not possible to use the sfp on the LAN.
Of course “input” and “output” generally make little sense on a router, but domestic ones that assume and insist on NAT from internet to LAN ironically do benefit from being described as input and output.
Agreed, far too many devices with no earth wire, although safe if genuinely double insulated, but to provide an earth wire but leave it disconnected is still dodgy I reckon 
My cable modem/router is in another room 50 feet away from my HT/audio room. I tried different hooks up:
- Cisco switch next to router using Ethernet cable
- Cisco switch in HT room using Ethernet to ER
- Cisco switch in HT using fiber to ER
- Cisco to TPLink fiber converter to ER
- option 4 using IFi Power to TPlink
- option 3 and 4 using 3 different SFP from Cisco, TPlink and another brand.
- Using Different circuit away from my hifi equipment.
- replacing Cisco switch with ER and run long Ethernet to LUMIN.
My audio system is highly resolved, I could hear changes in SQ with most adjustments but like #5 and#7 no difference.
In my setup (YMMV) best SQ is #3 with Cisco SFP connecting to A side of ER, B side to LUMIN. Now that the dust has settled, I move on to next tweak: Just added the SP3 power regen, so far it has made improvement, still need to do more evaluation.
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That’s a good point, although with this unit I believe you can configure any of the ports to do anything so SFP can be outgoing etc.
As a disclaimer, I do not use this unit so my knowledge is secondhand.
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