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OTL Asylum OTL, Output Transformerless Amplifier User Group. |
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In Reply to: RE: There's gotta be a bug somewhere posted by cpotl on January 21, 2015 at 05:33:40:
The non-standard output impedance method is actually based on the formula for calculating the output impedance of a cathode follower. But as you point out, the graphs really make the point.
The problem is that quite often the application of loop negative feedback contributes to higher ordered harmonic content (re.: Norman Crowhurst). Since the ear uses such harmonics to calculate sound pressure it is very sensitive to these harmonics; so much so that even trace amounts that are hard to measure are readily audible, which is why transistor amps tend to sound bright. The brightness is not measurable as a frequency response variation, in just the same way that the 'warmth' of a tube amp is not.
Quite literally the application of feedback causes a violation of one of the most fundamental rules of human hearing perception. The Power Paradigm is a means of getting around that problem. The idea is that while frequency response is likely to not be as accurate, colorations due to distortion (which are interpreted by the ear as tonality) will be reduced. Since no speaker is really flat with any source, the actual real-world result is that you can get what sounds like very uncolored sound.
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- Sounds/looks like we are on the same page here - Ralph 08:28:21 01/21/15 (0)
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