Oh jeez, not that guy. He's a former hifi salesman, with only a very tenuous grasp of the technical details. I've experienced this countless of times, the sales

Oh jeez, not that guy. He's a former hifi salesman, with only a very tenuous grasp of the technical details. I've experienced this countless of times, the salespeople completely buy into the "high end" mumbo-jumbo and don't bother to actually learn the technical aspects. It's very common for them to show some minor effect on an oscilloscope, but ignore the fact that any artifacts from ringing and such would be close to the Nyquist frequency and below -80dBFS in the signal. In other words, utterly inaudible. For all their talk about trusting their ears, they seem to conveniently forget that maxim the moment it doesn't suit their made-up arguments. Yes, in theory you cannot 100% perfectly band limit a signal. However, in practice you can band limit it well enough that any artifacts are either very close to or actually below the noise floor, and thus completely irrelevant. On the complete opposite end of the scale of salesperson:tech guru, the article I linked was written by none other than Chris "Monty" Montgomery (xiphmont on this very site), who among other things founded the Xiph.org free codec foundation, and either was fully responsible for creating the Ogg container format, the Vorbis, FLAC, Speex and Opus audio formats, and countless other technical achievements, or at least had a big hand in them. Free and open digital audio owes a gigantic debt to him, and if anyone knows their way around digital audio, it's him.