does the noise cancelling indeed produce a hiss?
We've talked about audio before. Always a pleasure.
Yes, it's true, regardless of the manufacturer. An aspect of the technology itself. So ultimately it just depends on your own subjective sense of hearing and likes/dislikes. Subtle, but it's there. It's really about
countering noise as opposed to actual noise cancellation.
Your observations seem similar to my own, in that I prefer Bose to Sony. One thing for sure though, IMO the worst thing one can do with such types of headphones is to fold them up. Where it can slowly weaken the internal wired connections to a point of malfunctioning. I continue to use conventional wired headphones so as not to have to hassle with constant battery charging. Have to admit though, the bass is pretty powerful with my Audio Technica ath-m50x headphones. Perhaps a little
too powerful. But the overall frequency response is excellent. Especially in monitoring digital audio to filter out any unwanted imperfections.
I must say, getting older has one advantage. I don't have such an acute sense of hearing as I once did, which didn't help in being a perfectionist, let alone a fellow audiophile. It also helps that my taste in music doesn't go past 1989, so I'm not all that discriminating over digital compression of audio files as you may be. Not to mention possessing any number of commercial CDs originally produced in the 80s and 90s at a standard 192kbps at the time.
Be careful about YouTube sources. No telling the origins of what is allegedly recorded, not to mention that many online recordings appear to be over-modulated to the point of clipping.
Worse still you may run into analog recordings with all the typical audio artifacts, transferred to digital but still there. I still get perturbed when I discover people who upload recorded analog vinyl records where I eventually out them in discovering so many unwanted sounds of ticks, pops, clicks, and turntable rumble/wow and flutter. I threw out all my vinyl records the day I purchased my first CD player. So yeah, I'm a bit biased...lol. True digital can be harsh, but it's generally artifact-free.
When encountering digital copies of analog vinyl records, I pretty much just pass on them altogether. Though old cassette recordings are somewhat easier to filter though the use of programs like Audacity. In that respect I actually like the compression algorithm that seems to subdue inherent tape hiss as well. Though in some cases I've also encountered RF "line" interference, requiring the use of noise and notch filtering.
How Noise-canceling Headphones Work