Jeg saksede lige det her fra Audiocircle, egentligt meget interessant og stof til eftertanke:
I am reminded of an experiment done in the very early days of digital in response to comments that CDs lacked the "air" and high frequency detail that vinyl replay possessed.
The surface noise of a vinyl disc playing a silent (unmodulated) track was added to the relatively noise-free digital recording. I believe the same was done using white noise.
The general reaction to the combination of musical signal and noise was that now there was more detail and air to the sound and it was actually preferred. I heard this around 1986.
This would tie in perfectly with the notion of a very clean tweeter being perceived as having a slightly rolled-off top.
A similar thing happens at the bass end; a speaker with clean bass end, that is, with less overhang, or able to stop faster, will be perceived as being bass shy in contrast to another that has the same measured response to steady state tones but more overhang. Same amount of bass program content, but in the latter case more noise added at similar frequencies equates to the sensation of more bass, it's just that in both cases (HF and LF) what is added is noise - it's just not perceived as such.
Russell
Mvh,
Karsten