Not to cause a huge arguement but the nyquist-shannon theory is for the absolute minimum representation of a frequency, not an accurate one. Sampling at exactly double the highest frequency turns a sine wave at that frequency into a triangular saw tooth wave of the same frequency. You need a much higher sample rate to get a realistic reproduction of the origional sound wave.
Just think about it, if you have a 1khz signal and you take a sample at 2khz you take one sample at the top extreme and one at the bottom. When you recontruct it that makes for a striaght line from top extreme to bottom extreme, and back again. And that's assuming that the sample is matched perfectly with the tone, if it isn't you get worse effects coming into play, that's actually the best case possible for Nyguist-Shannon. It's actually possible to completely mute the tone if the sample is aligned at 180degrees to the best case. And anything between 180 and 0 degress phase difference will give you attenuation of the amplitude. It's a lot more complicated than just you might think.
Even at 4 times the tone frequency you get a very messed up wave coming out of it. Yes DACs are designed to accomodate for this as much as possible, but they do it by making educated guesses. In reality we aren't dealing with pure sine wave tones which stay locked in at a nice constant frequency where we can just round things out and hope everything will be ok.
I'm not saying they are right, just saying I wouln't discard the opinion of two experts on the basis of basic and largly approximated thoery.
Anyway, this isn't a discusson for this thread. There's an entire sound science section of forum for that.
Heck, I was just trying to balance the scales. I think the claim about bass makes little or no sense. Also we are not sampling at 2 kHz, so that statement isn't in context. So then, let's leave this alone and discus how wonderful the Bifrost is, My Uber USB Bifrost should be arriving on Friday.