Thats a good point on the cable roll off. Especially with hp's such as the HE500's that I was using. I like the treble on them, but a lot of peeps find them "hot". I can understand that being the case on certain music like classical where the dynamics are full flowing. But then again, full flowing brass is "hot". An equalizer would be able to find the sore point and calm it down more than a cable designed to roll off would, I agree.
My only concern with that theory is; Why would such a well known brand of expensive cables make one of their high end cables "roll off" treble? Make it smooth, yes. But make sure the dynamics are still there as much as poss. Peeps with high end gear (I'm not one of them) don't want cables that roll off anything. They want to hear what their expensive dac has to offer and they don't want cables to interfere with any part of it. The cable should be invisible theoretically. What I'm now hearing tonight with the VDH's is that all the dynamics are still there from top to bottom, only the very top peaks are smoothed out. I would also have to admit that the sound is less bright, or seems to be. But not in any form of dullness or compression. Just more "nice" perhaps softer at the top. But only at the very top.
Most properly (and reasonably priced) cables should "sound" very similar because they are, by all practical purposes, flat in the audio frequency range. Extending the frequency range of such cables might be useful for high speed communications, but unnecessary for audio frequency range applications.
It is quite possible to add all sorts of load coils and stuff to a cable to behave as some odd fixed filter. This would require some extra components... and expense. Obviously this does not result in a theoretically and practically "invisible" cable.
Smoothing all sorts of tremble peaks with cable is a difficult task. Different headphones and gear would have tremble peaks and nulls in different frequencies, and most cables have no means to detect and fix these issues.
A cable that rolls off at the high frequencies effectively smooths out things in the time domain, and makes things less bright. But it takes away things that it should not smooth out also. You would definitively hear these issues.
Edited by ultrabike - 1/31/13 at 1:50pm