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More chaotic cable arguments...
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<blockquote data-quote="Ampdog" data-source="post: 14452" data-attributes="member: 144"><p>Further to the above diagram:</p><p></p><p>Not to turn this into a sub-debate, but one does notice there that especially higher order products tend to flatten out at 30dB of NFB. Perhaps with more NFB this will tend to turn back - I did not investigate. I read that some exponents mention that "normal" semiconductor amplifiers have 40 - 56dB of NFB. Whew! To me that is looking for trouble. I stopped at 29dB NFB in my design, finding there that everything is > 8dB below the threshold of audibility, which I hoped would be safe! </p><p></p><p>Main thing is, as you said, that some high-end designs show unacceptable (to me) levels of high order products.</p></blockquote><p></p>
[QUOTE="Ampdog, post: 14452, member: 144"] Further to the above diagram: Not to turn this into a sub-debate, but one does notice there that especially higher order products tend to flatten out at 30dB of NFB. Perhaps with more NFB this will tend to turn back - I did not investigate. I read that some exponents mention that "normal" semiconductor amplifiers have 40 - 56dB of NFB. Whew! To me that is looking for trouble. I stopped at 29dB NFB in my design, finding there that everything is > 8dB below the threshold of audibility, which I hoped would be safe! Main thing is, as you said, that some high-end designs show unacceptable (to me) levels of high order products. [/QUOTE]
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