gene said:
Whao Jon, I mean John
What audio system do you know that can do this? No digital media can do this (nor should it!) let alone any loudspeaker. Cabinet diffraction effects and room acoustics severly limit a speakers frequency response much beyond 20kHz, especially off axis which is where we listen. In addition, extending an audio system bandwidth out this far will compromise signal to noise ratio and possibly system stability. Certainly in this regard, the cable is far from being the limiting factor or cause of concern.
Now now...be nice....
I'm doing my best to explain this as simply as possible, y'all donna want me to pull da stops, now does ya???
Do not confuse the ability to reproduce a 500 Khz sine wave with the ability to accurately reproduce two independent signals with 2 uSec temporal accuracy.
I am not talking about system bandwidths up there..my reference to hundreds of khz capability is not full power sine wave, but simply the inverse of the timing numbers I am talking about.
What I am saying is that humans can distinguish left to right delays at the ten or so microsecond level...think of it this way...put a source behind an optically opaque screen...now, with your eyes open, have the sound made behind the screen, and point to it..if you can "see" and point to the source to within 5 inches at 10 feet, you have shown the ability to distinguish left to right delays to less than 20 microseconds..if you can get within two inches, you show 8 microsecond ability..one foot is 40 micro...
Soundstaging is the virtual image produced in our brain, much of it due to the system's ability to correctly reproduce those timing relations. Mess up the timing from one channel to the other, and the cues we use for imaging are messed with..It's not a case of putting one's head in a vise, but what each ear hears in time, regardless of head position..we internally correct for small head rotations..
I am not concerned here with the speaker temporal or amplitude response..nor, the matching of each speaker...but rather, how the brain generates an image, and how that image is altered by timing relations..
BTW...Jon wouldn't be having this discussion.
..as this discussion here, at this site, is all about testing...electrical ones, clearly defined..with criteria......need I say more?
(of course, that was just a cheap shot even if it may be historically accurate.....in actuality, he is welcome to participate here, as are all. As I have stated elsewhere, two hands are needed to clap)
I have a lot of graphs and equations to support and define what I speak of, but your "darn" site doesn't allow me to post the pics in the body of the text, and I don't think I can get multiple pics on the same post...
Here, however, is a graph showing energy storage in a 10 foot long wire...8 ohm load, 100 Wrms, vs the characteristic impedance of the wire, dielectric coefficient is 2.7..note that the energy, while in microjoules, is actually a significant fraction of the instantaneous energy delivered to an 8 ohm load at 10 Khz...the further away from match between line and load, the more lead (or lag) will be evident.. Is it enough to meet the 1.5 to say, 20 usec temporal shift needed to trash the soundstage image? Don't know yet..the distributed L/C transmission line model , I haven't modelled.
Cheers, John