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Old 7th August 2005, 07:22 PM   #1
anli is offline anli  Russian Federation
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Question Neutral amp parameters

The aim is to collect all known public results of different truly-blinded tests concerning sonic perception. As a result of such integration I'd like to see a list of parameters/demands for "perfect neutral amplifier" (my hope is, all colouration-aware debates will be beyond the thread. Truly neutral amp is the aim).

Among common parameters some other are in interest too, for example:

- infra-low (till 0Hz) and ultra-high frequencies inside amp BW,
- thermal (memory) distortions,
- harmoincs (each harmonic individual level, i.e. harmonics dustribution) dependency on SPL, or...
- masking effects (lower harmonics are masked with audio signal, higher harmonics are masked with lower harmonics, ... what else?),
- ... ?

Please, give refs to public available resources only!
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Old 8th August 2005, 06:58 PM   #2
anli is offline anli  Russian Federation
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Angry science fiction only?

Hey you! It is difficult to believe, all audio-related statements in the world are science fictions only. I still hope there are some true science tests somewhere.
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Old 8th August 2005, 08:16 PM   #3
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I think it is hard to tell neutral amp from not neutral.
How should one know that the amplifier is neutal?
There is no pattern, no template of perfect neutrality, only comparison tests. For lo-fi you just compare with better eqipment to judge if something's more or less. neutral.
It is a bit like search for most typical man in the world
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Old 8th August 2005, 08:46 PM   #4
anli is offline anli  Russian Federation
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Quote:
Originally posted by darkfenriz
I think it is hard to tell neutral amp from not neutral.
How should one know that the amplifier is neutal?
There are plenty audio perception measurements in audology. It is possible to define different "ear thresholds". But I have not found such results concerning amps designing.

Saying "neutral" I mean very simple thing: audible or not. Above or below different thresholds.

For example (as for thermal distortions): "result of these tests is: CC beoynd NFB loop, 2SA1045 is in use, power deviation must be <= 1mW".
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Old 9th August 2005, 01:46 PM   #5
PMA is offline PMA  Europe
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The issue is "public results". Many of us have been trying to perform some kind of similar tests and to collect the results, but they are neither "public" nor published.
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Old 9th August 2005, 02:20 PM   #6
anli is offline anli  Russian Federation
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Quote:
Originally posted by PMA
The issue is "public results". Many of us have been trying to perform some kind of similar tests and to collect the results, but they are neither "public" nor published.
Aha... Such results exists at least... OK. But it means almost all discussions here (and at similar forums/groups) are not more rather massagings of dead ideas. It is very sad.
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