Everyone begins and ends this part of the audio journey differently. What is the baseline from which to compare? Is it a redbook cd vs a streamed version? We then must obsess over whether the recording is consistent between the two samples?
I experienced some streaming improvement when I inserted a Network Acoustics Rubicon switch and NA Muon filter in my system. At the time I utilized an Innuos Zenith MkIII. A number of dacs came and went but overall, I “believe” I heard an improvement. I replaced the Innuos with the Grimm MU1 and just assumed it was optimized. I then received the Muon Pro setup and pulled the Muon and I heard no difference….then I “believe” I heard addition by subtraction…in other words, I removed the Muon, Muon Pro and noted no improvement or degradation. Heresy? Perhaps. Is the MU1 addressing the same things as the Muon? Perhaps. Differences in ethernet cables? Well, I’m not hearing any differences and yet I “believe” I did in my Innuos setup. @fredrik222 is correct but sometimes he gets so frustrated with people that he may lose the audience.
No offense to anyone because we have to trust our own impressions but “hearing” one ethernet cable and then replacing it with a different cable and listening one week apart isn’t reasonable. I happen to “believe” that streamer quality and especially dac quality are where your opportunity for improvement resides. In my use case I am able to listen to an identical (to the extent I am able to validate) track streamed vs local file via AES into my dac vs the same tracks streamed over ethernet to my dac (as a Roon endpoint) vs a local file streamed over ethernet to my dac (once again, as a Roon endpoint). I do not hear a meaningful difference between the streamed vs local file over AES. Both are superior to streaming to my dac over ethernet be it a Qobuz track vs local file. Over ethernet, the local file is superior to the Qobuz stream.
What does all this mean? I believe the Grimm/Taiko types of server/streamers just clock better and use a superior interface (aes/ebu). YMMV but audiophile switches, cables and filters are system dependent…and in my current setup they are mostly redundant. Dont think that $5k in upstream ethernet filtration and gadgets are going to make a Gustard/Bluesound combo world class. They can be satisfying but for most people, buying a quality streamer and a quality dac will yield better results.