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The Audibility Of the Improbable
  09.21.2009      
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1 Posted by : William Meadows
Dec 11, 2009 5:15PMREPLY
Your test procedure was flawed in precisely the same way as audiophile tests often are. If you know which set up you are listening to, you cannot fairly judge it. Your impression is biased by your knowledge. It is possible that a grossly undersized power cord could limit the current flowing into the power transformer, thereby affecting the voltage regulation on the DC side of the supply. You would know this was happening because the cord would heat up. If you have a sufficiently large gauge power cord, one that will not limit the current supply, then the power supply operates the way it was designed to. A properly designed power supply will have filter caps on the DC output that supply current for transient demand by the circuit. Here is the key point - the demands of the circuit are met by the output side of the power supply, NOT the AC mains. If the power supply is properly designed to handle the demands of the circuit, there is nothing you can do on the AC side to change the performance of the circuit. ESP's claim to affect midrange harshness or anything else in the sound is totally without physical basis.
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Post a comment
1 Posted by : William Meadows
Dec 11, 2009 5:15PMREPLY
Your test procedure was flawed in precisely the same way as audiophile tests often are. If you know which set up you are listening to, you cannot fairly judge it. Your impression is biased by your knowledge. It is possible that a grossly undersized power cord could limit the current flowing into the power transformer, thereby affecting the voltage regulation on the DC side of the supply. You would know this was happening because the cord would heat up. If you have a sufficiently large gauge power cord, one that will not limit the current supply, then the power supply operates the way it was designed to. A properly designed power supply will have filter caps on the DC output that supply current for transient demand by the circuit. Here is the key point - the demands of the circuit are met by the output side of the power supply, NOT the AC mains. If the power supply is properly designed to handle the demands of the circuit, there is nothing you can do on the AC side to change the performance of the circuit. ESP's claim to affect midrange harshness or anything else in the sound is totally without physical basis.
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