Ritteri...The dreaded science card!
You may be right about SACD resolution not being all it's cracked up to be. I read an analysis on another site that claimed that above 8000 Hz, SACD is inferior, and any improved sonics must be the result of the most important musical content being below 8000 Hz. (I didn't completely follow the argument...does anyone else have thoughts about this?)
Resolution of a CD or SACD or DVD-A depends on how much dynamic range you want to have. If you compress the loud peaks, the LSB can have better resolution, for any kind of disc. A 16-bit CD could be better than a 24-bit DVD-A, but it would trade off dynamic range. For rock music that is loud all the time this is a reasonable thing to do.
One thing is certain: the 44.1 Hz sample rate of CD's is very marginal. The Nyquist criteria of communication theory says that to capture an analog signal without loss of information, the digital sampling rate must be twice the highest frequency of interest. Thus many people think that 44.1KHz is OK for audio. However, the Nyquist criteria applies to sine waves. Music is not sine waves. The increase of sampling rate to 96KHz (or 192KHz for stereo DVD-A) and (if you believe Sony) similar improvement for SACD, is technically appropriate, although not everyone's ears can appreciate the sonic benefits. I prefer to call CD's "low resolution" and SACD and DVD-A "OK resolution".
You may be right about SACD resolution not being all it's cracked up to be. I read an analysis on another site that claimed that above 8000 Hz, SACD is inferior, and any improved sonics must be the result of the most important musical content being below 8000 Hz. (I didn't completely follow the argument...does anyone else have thoughts about this?)
Resolution of a CD or SACD or DVD-A depends on how much dynamic range you want to have. If you compress the loud peaks, the LSB can have better resolution, for any kind of disc. A 16-bit CD could be better than a 24-bit DVD-A, but it would trade off dynamic range. For rock music that is loud all the time this is a reasonable thing to do.
One thing is certain: the 44.1 Hz sample rate of CD's is very marginal. The Nyquist criteria of communication theory says that to capture an analog signal without loss of information, the digital sampling rate must be twice the highest frequency of interest. Thus many people think that 44.1KHz is OK for audio. However, the Nyquist criteria applies to sine waves. Music is not sine waves. The increase of sampling rate to 96KHz (or 192KHz for stereo DVD-A) and (if you believe Sony) similar improvement for SACD, is technically appropriate, although not everyone's ears can appreciate the sonic benefits. I prefer to call CD's "low resolution" and SACD and DVD-A "OK resolution".