There's yet to be a DAC that I've tried the filter with that hasn't benefited. I think maybe it is because DAC guys are just focused on other things and overlooked this one in the process - maybe, I guessing? I suppose based on my experience thus far, they all broke, as you would say???
One should also appreciate that many, many DACs are nothing more than implementations of the their respective dac chip data sheets - if that's what you meant.
Yea, I can see you looking at some chokes, etc. and saying the parts don't add up to much. But, one must also have the knowledge and skill to know and put it together. Near as I can tell, I'm the only one to have ever done so in the manner that I have. Certainly, my labor is worth something?
Frankly, in my and most people's opinion once they hear the filter, it is worth much more than $200 sonically. I wish I could charged based on its sonic merits.
Look we can all measure until we're blue in the face - nobody busy audio gear to measure it. Everyone busy audio gear to listen to music.
The measurements in the link sheets - provided one knows how to read them - are more than enough. Several of you are assuming that USB receiver designers know how to impedance match so the differential data signals see the same relative Z - that ain't the case in my experience! In contrast, most seem to be schooled more so in software and digital design. Not the technique of impedance matching at the frequencies involved here, so that a balanced signal results in proper cancellation. You're assuming something that is supposed to theory does, when in practice, nothing could be further from the truth.
Nor, I've been building and designing audio gears for decades....Look me up on the Internet - though I predate that....