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Re: Let's compare numbers and see why mine are different from yours

Our ability at discerning a sine direction folds back on itself due to ear to ear spacing and wavelength considerations.

Yes, I understand that you two are talking about single channel.

Unfortunately, stereo is not that. So, one must consider the consequences of multiple signals in the same path(s).

As a very simple example (with constraints simply applied for this thought example), consider two images, the focus image (say a vocal) and the comfounding one (say a bass guitar), bass on the far right, with vocal 45 degrees to the left.

Now, assume the bass signal causes the right system to approach it's useable output capability (vocal included in that capability of course). Without the bass signal, voice placement is as intended (forget the fact that zero ITD signals are not naturally occuring ones). Now, add bass.

Do the vocals maintain their interchannel timing relationship, or will they stray based on the amplifier's ability to maintain control of the output node? Anybody ever measure damping factor at mid to hf? Anybody ever measure it at high voltage or high slew rate?

Can anybody measure the timing relationship between the two channels to 5 uSec, with the bass added?

Is a 20K bandwidth system adequate to measure this?

We localize based on ITD and IID, but yet, we cannot measure ITD accurately enough to duplicate our ears when a confounding signal is present.

Your stylus example...why did you not do the trig calcs and post the numbers? I woulda..:-)

If a stylus output brings the stage close to it's slew capabilities, how far off does the ITD go? Is it better to just "get close", or should one design over requirement as I said I do for all test equipment. Seems to me that is what jc is espousing.

FFT's lose temporal correlation interchannel, so I wouldn't try using that test technique.

CD...hmm.. my sound card output is mux'd, the 11 usec interchannel delay is annoying and impossible to correct for using a pan pot. And the reconstruction algs have to work too close to nyquist, I do not know if it is possible to maintain ITD in light of that. Still, I do like using cd's.

Cheers, John

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