Before you read any further, go to Google and type definition: asynchronous.
So I'll say it again -
1. You can't "re-clock" unclocked data
2. You can't have jitter when the data is not timed/clocked!
I am not (and have never advocated) connecting a DAC via wi-fi.......I am using a computer (in my case, Raspberry Pi, but you can use any computer) to send bitperfect data to the DAC.
All you've got to do is get data (ALL the data) to the DAC. It is capable of doing everything else. That's what you're paying for.
The DAC is powered by its own power supply, so in this case, sure the power side of the USB may well be energised, but there is no current flow. In fact, I would expect the designers have actually "cut off" the power side of the USB cable at their input........but I don't know. All I do know is that......when I have paid what I have for my DAC, I trust the designer has taken the necessary steps to ensure the data stream is not damaged.
That's not to say my DAC is perfect. It is not. It can most certainly be bettered. I just don't think there is any economic sense in me trying to do that with little snakeoil tweaks. If I want a better DAC, I'll go out and buy........a better DAC.
You keep mentioning "jitter", but you haven't read my post above - how can you have jitter on a line that is not even clocked??
Wired connections are certainly superior in terms of stability, reliability and speed.......but it doesn't impact on sound quality. Because all the data is transferred bit-for-bit. Even high-res audio places very little stress on modern wi-fi networks.
And coax for DSD - it won't even work because it doesn't have the bandwidth for anything more than DSD64, so why on earth would you want to convert USB to coax? Why would you want to lock your DAC to a SPDIF stream when it can control the show with async? I2S yes, but how many DACs have an I2s HDMI input?
Honestly - if you think you can do better than DAC designers - If you think the heavyweight designers are missing important things that can somehow be fixed wtih cheap little tweak boxes............ by playing with these tweaks in your lounge room, I think you might be a bit misguided sorry.
You would do well to read up on what async USB connections are. (Like the actual USB-IF spec - not some pseduo audiophile company telling you everthing that is wrong with USB and how their products can miracously fix it).
You physically can't "re-clock" any data on an async USB line (and you inherently don't have jitter) becasue the line is being controlled by the DAC and it's clock. The only jitter when you use this type of connection comes from the DAC itself (and its clock)......which is present no matter how many "re-clockers" you put in between!!
So any company telling you that they are "re-clocking" an asynchronous connection is bull5hitting.......they don't even understand the basics......or common sense......and I certainly wouldn't trust them with my precious audio signal!
I wish you could "fix" USB data.......I could use one of these things to do my internet banking and get a bigger bank balance......but alas, no. USB connections are designed for bitperfect data transfer, and that is exactly what they do - whether the data represents banking, OS updates.......or even, shock horror...... music.
I'll finish by asserting that what you are doing may actually be hurting the sound......it may not be hurting the sound of course, but I think it is likely. A cheap device that is trying to send data to a DAC at its pre-defined set rate (re-clocking), when the DAC is the device that is trying to control the rate (async) would lead to some very strange scenarios........I can't predict what might be the result. But I know enough to know that I wouldn't even attempt such an absurd scenario in my system.
