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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: both replys posted by tomservo on June 20, 2006 at 18:38:21:
And a non-nullable but flat GD is not equivalent to a 'quality factor', either.The point is that GD can and often will significantly reduce the effectivness of a null test for amplifiers if the intent is to discern 'quality'. For instance, I own a very well regarded Class D amplifier that has an audio band group delay of up to several tens of microseconds depending on frequency. How would it fare in a null test? Not so well, but no reasonable person would rate it lower in audible quality on that basis.
Also, to get the lowest possible GD, I read David Hafler deliberately compromised the stability under load of the amps under test. Higher 'quality factor' because of a deeper null? I think not if the amp is marginally stable into tough loads.
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Follow Ups
- "Thoriated, the GD in band of modern electronics is insignificant." - not compared to distortion - thoriated 07:51:15 06/21/06 (2)
- Re: "Thoriated, the GD in band of modern electronics is insignificant." - not compared to distortion - tomservo 10:47:58 06/21/06 (1)
- Re: "Thoriated, the GD in band of modern electronics is insignificant." - not compared to distortion - thoriated 11:52:43 06/21/06 (0)
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