None of the FMC’s on the market are designed for audio applications. There’s ultra low noise transceivers out there, but to do things right requires custom designs. We power our fiber transceivers with Belleson SPZ discrete regulators.
I’ll power the DAC side unit with an Uptone UltraCap LPS-1 that I have here not doing anything. Even though the TP-Link FMC has switching regulators inside, the LPS-1 is ‘off the grid’ so that may / may not have benefits.
I don’t expect it has worse components than my router anyway, so I don’t expect it to worsen sound quality than the current straight ethernet connection I’m using but some people haven’t had a good sonic experience and went back to the straight ethernet connection.
Yeah, we’re gonna need to go ahead and move this thread downstairs into storage B. We have some new threads coming in, and we need all the space we can get. So if you could just go ahead and pack up this thread and move it down there, that would be terrific, OK?
We have not tested it but we do have a number of our Lumin users who feel that MC110CS improved the SQ of their setup. In addition to be careful about 100Mbps vs 1000Mbps models, it is important that the DAC-side FMC needs to have a LPS (which you’ve already planned for). Most, if not all, reports about it I’ve read are positive.
Whether the supply is an LPS or SMPS is irrelevant. What matters is how clean the power it produces is. Our hybrid SMPS outputs 0.8uV ripple noise, and 30uA leakage current. It also rejects mains noise 1000x better than any LPS. On the downside it costs about 4x in BOM of the typical LPS you’ll find in $10000-$20000 streamers.
The TP-Link FMC’s uses a switching regulator at the DC input (probably why it accepts an input range of 5Vdc to 9Vdc) which may or may not produce high ripple noise. So even if you use a linear PSU, the weakest link may be the switching regulator?
I did read that after the switching regulator there is an LDO or two, which should help, depending on the ripple noise of those of course.