Ironic. I find ASR useful and informative as I do have an engineering background, designed and modeled in Spice amplifiers, crossovers, and preamps. But most of us understand specs as currently understood are not the last word. I'll take a Hegel over a Benchmark amp any day. The irony is, I was tossed off ASR because I believed ( know) I could hear the difference between DACs and amplifiers. My wife can do with more precision than I.
I suggested load variances as one factor effecting sound. I also mentioned dynamic compression in tweeters. Both quite real, measurable, but not in Amir's playbook. Harder to measure is the effect on IPS and VAS from bass transients with poor board layout or insufficient dynamic current. Again very real. I can even model it. I found by testing, tweeter breakup causing IM making upper midrange edgy. Again, Amir does not believe this so he banned me. Not exactly scientific in my book, but it is his site.
I only have about 500 CDs on my server. Hitting Goodwill every week to grab any 69 cent one that looks' even mildly good. I have not gone streaming yet as it takes too much effort. I am an old guy and do not live with a phone attached to my hand and don't own a tablet. Eventually. Soooo much great music out there. And Sooo much garbage to wade through. I wish I had any assurance that streamed files were at least CD quality. From what I have heard and read, a lot are just old garbage up-sampled. I gather Qobuz is about the best. I have Prime, but found it to be a mess and did not have half of what I went looking for.
I compared some "HD" streamed files with the same music in RedBook and did not hear any difference,. Always a "but" and in this case, it was not showing the specific edginess that bothers me. Nora Jones does not hit those notes. She is always smoooooth.
So, I RIP with JRiver. Play over USB to my DAC. WASAPI Exclusive, asynchronous. Testing buffer sizes, testing if -3 dB is best. May test ASIO as well but I don't see the advantage. Looking into host based oversampling, normalizing, and any other possible off-line processing to feed the DACs. Or, just a DAC like the RME or Cord that has the power internally. My PC DVD transport, about $15, reads the disks 100% error free at about 5X. There is nothing else a transport need do. Any jitter, noise, rise time issues are completely lost when the file is saved to disk. Just physics. We now have USB interfaces that don't mess up the signal, even in CH-FI. The DAC chips are all fantastic, which leaves the reconstruction (including clean power) as what effects the sound. Good and bad.