blind test substantiating claim of amplifier sound difference?

Discussion in 'AV Receivers' started by keir, Jul 8, 2003.

  1. keir

    keir Stunt Coordinator

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    anyone have a link to some information about a blind test that showed audible differences between solid state amps? i have found several published results on the web showing that there is no audible difference even between receivers and high end seperates, but no evidence to oppose that conclusion.

    as it stands now i am thinking that the claims of huge sound difference between amps are about as credible as those pertaining to speaker wire.

    if you know different please set me straight [​IMG]
    and anecdotal evidence shouldn't be important in this discussion, i have seen plenty of that already.
     
  2. RichardHOS

    RichardHOS Second Unit

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    There's an article on Stereophile's archives in which they attempted to prove that amplifiers can sound different.

    They, of course, come to the conclusion that there is an audible difference, though if you read closely you'll not that both their test methodology and interpretation of the raw data are flawed. If anything, they proved that in the environment they had set up, differences were exceedingly difficult to hear.
     
  3. RobertR

    RobertR Lead Actor

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    I can think of one circumstance in particular that could show audible differences between SS amps: when driving very low impedance speakers, such that the current producing limits of the amps were stressed. One of the rec.audio.high-end audio objectivists drives his very low impedance Apogee ribbons with a Krell amp for this reason.
     
  4. Chu Gai

    Chu Gai Lead Actor

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    That is a nasty load.
    Also if the output impedance of your amp is on the high side, say several ohms, one will create a bastardized form of equalization that's dependent upon the speaker's impedance curve. Some manufacturers play this game very carefully and design amp with what they call near zero or minimal local or global feedback. Distortion, usually even order harmonics, rise a bit to give a perceptible glow to the sound and the equalization can result in selectively boosting certain areas of the frequency response curves. However, if distortion is kept to inaudible levels and one follows the approach of low impedance into high impedance down the line, and further the FR of the amp is linear, the audible differences under controlled testing would be supremely difficult to ascertain with a large degree of confidence.
     
  5. Yogi

    Yogi Screenwriter

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    Is it that time of the year already to have yet another one of those silly discussions. It must be[​IMG]

    As for me I am staying away from this flame bait.

    Happy flaming each other's asses folks, and make sure the dead horse is dead this time[​IMG]
     
  6. Chu Gai

    Chu Gai Lead Actor

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    [​IMG]
     
  7. keir

    keir Stunt Coordinator

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  8. RobertR

    RobertR Lead Actor

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  9. RichardHOS

    RichardHOS Second Unit

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    He was correct on both accounts... the differences are extremely small.
     
  10. Chu Gai

    Chu Gai Lead Actor

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    Must be a bitch when he goes in for an eye exam [​IMG] All that rapid switching.
     
  11. RobertR

    RobertR Lead Actor

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  12. Chris Quinn

    Chris Quinn Screenwriter

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    "Must be a bitch when he goes in for an eye exam "

    Isn't that why it is a blind test?

    That writer never even got around to rearranging his prejudices.[​IMG]
     

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