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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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In Reply to: RE: If you like smoothness, transparency and bandwidth, yes nt posted by Retsel on November 15, 2021 at 11:53:10:
Feedback plays an enormous role in the sound of an amp.
Of course it reduces distortion. But if in insufficient amounts (which is a very common problem) it introduces higher ordered harmonics which the ear senses as brightness and harshness.
For feedback to work properly and since distortion will never be eliminated entirely, its important to satisfy certain requirements.
First the feedback must be the same at all frequencies in the audio band. Most amps made don't do this- feedback falls off as frequency is increased, owing to insufficient gain bandwidth product.
2nd, the distortion signature should be such that either the 2nd and 3rd (or both) harmonic is sufficiently higher than the higher harmonics that it is able to mask the presence of the latter.
Failing that the distortion should probably be over a 100dB down so that is entirely masked by the audio signal.
If all three of these are satisfied it will not matter what kind of amp it is- it will sound like music to the ear provided the frequency response is flat across the range.
Since getting the distortion down that far is nearly impossible with a tube amp, as well as getting the required gain bandwidth product, then getting the right distortion signature becomes paramount.
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Follow Ups
- There is some useful information there but there isn't a disscussion about the effect of feedback. - Ralph 12:07:18 11/15/21 (0)
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