darrenyeats wrote: > Arny, > You make your argument with characteristic gusto. I agree with some of > the facts you provide, e.g. a lot IM is generated by music replay, but I > don't see that I should infer from this that the HD profile is no factor > for subjective quality. Your argument seems to imply there can be no > such thing as euphonic distortion in replay, no? > > Of course we can't absolutely draw a straight line (so to speak!) from > HD to IM in the real world e.g. http://www.linkwitzlab.com/mid_dist.htm. > Darren
You're hearing me say what you want to hear, not what I said. If you listen to anything but simple test tones over a system with nonlinear distortion, you will hear IM. It is probable that the IM will predominate because of its nature. (explained by means of a simple example, below) The only way to have the HD profile be a greater factor than the IM is to listen to pure test tones. As soon as you start listening to music, the IM will overwhelm the harmonic distortion. Let's say that you have an amp that has only a second order nonlinearity that is as large as possible. If you put in 1KHz, you will get out a 2 KHz tone half the amplitude of the input wave, plus a DC signal that is also half the amplitude of the input, but since your speakers and ears dont' respond to DC, it will be inaudible. If you put in a 1 KHz tone and a 1.5 KHz tone that are together the same amplitude, you will make each half the maximum amplitude so they don't clip when you sum them. Due to the *same nonlinearity *you will get a 500 Hz tone, a 2 KHz tone, a 2500 Hz. tone and a 3 KHz tone. Right off you get about four times as many audible distortion-related spurious responses. The 500 and 2500 Hz tones are about half the size of each input wave, and the 2 KHz and 3 KHz tones are about half as large as them. So, the spurious responses from the IM are all audible and when added together have a about double the percentage as the one audible tone from the harmonic distortion. Thus the IM will overwhelm the harmonic distortion. Furthermore the harmonic distortion is likely to be masked by the natural harmonic structure of musical sounds, while the IM distortion as you can see, is about half tones that are not harmonically related to the source, and won't have anything to mask them in the music. They will blare in your ear! ------------------------------------------------------------------------ arnyk's Profile: http://forums.slimdevices.com/member.php?userid=64365 View this thread: http://forums.slimdevices.com/showthread.php?t=106914 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
