Can DOS 2 Phantoms reproduce acoustic programme above 24kHz?

[Jean-Marie]

I should also say that wide bandwidth is not only about amplitude, it's also about timing. The following was written by Morten Lindberg of 2L records. I had a brief email conversation with him on the merits of Redbook (16/44) vs high(er) rez. Translated from Norwegian: "Sample frequency: 44.1kHz is OK if you only evaluate frequency bandwidth. If we also look at the time domain we need higher bandwidth to give us an impulse response that can reproduce transients without pre and post ringing."

Yes, the focus of the majority of the debate (will add some links when I have more time) about the audible effects of high resolution are focused on the time domain.  

The problem is that afaik we don't fully understand why these effects are audible despite the fact that, although they are time domain-related, they lie in a frequency band that neither the microphones recording them, the loudspeakers reproducing them nor the ears hearing them "should" be able to process.

The crux of the problem lies in providing the scientific evidence that they are audible. 

I don’t know of any other means than ABX or DBT (Double Blind Tests) with proper level matching to eliminate any possibility of expectation bias. 

There are two major problems there:
1) ABX/DBT is not recognized by most if not all the proponents advocating for better than Red Book for reproduction (production is a totally different topic)
2) I’m not aware of any generally accepted study demonstrating the audibility or non audibility of those effects above the earring threshold. To my knowledge, every ABX/DBT study came back with the result that you could not distinguish between them while the one showing that you could make a distinction are not satisfying the requirements of the “objectivists”. 

To add even more complexity, if you have a ‘sub par’ system with non linear distortion, content outside the audible band will create IMD in the audible band, possibly giving the illusion that there is an effect. 

Last but not least, let’s keep in mind that nature and physics do not care what is performing the filtering. Therefore, if my hears are stopping at 15kHz (which I wished given my age, I must be closer to 12kHz now) that means that I have 120 dB of attenuation at 15kHz, and this will create in my own ears all the ‘ringing’ and other artifacts discussed there. 
I personally have high doubts that a 24kHz reconstruction filter (for 48kHz sampling rate) will have any discernible effect compared to my 15kHz ear filter. 

Jean-Marie