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Old 11th December 2011, 09:16 PM   #19001
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Quote:
Originally Posted by john curl View Post
Wavebourn, don't you hear the difference in line cords?
Presumably, Wavebourn's amps have competent power supplies.
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Old 11th December 2011, 09:20 PM   #19002
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And mine don't.
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Old 11th December 2011, 09:22 PM   #19003
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Originally Posted by john curl View Post
Wavebourn, don't you hear the difference in line cords?
When loaded on speaker impedance simulator?
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Old 11th December 2011, 09:23 PM   #19004
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And mine don't.
I'm surprised at that admission- I would have guessed that you'd be fine at designing competent power supplies for your products.
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Old 11th December 2011, 09:29 PM   #19005
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You are wrong, SY. It is true that better designing power supplies DOES reduce the sensitivity to line cords, but it does NOT eliminate it. I am very proud of my power supplies, but the best thing that I did for the JC-3 was to put a 10uf cap across the input line to remove the power supply problems and probably power cord sensitivity, at least to the resolution of the JC-3, which is not infinite.
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Old 11th December 2011, 09:35 PM   #19006
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Originally Posted by SY View Post
I'm surprised at that admission- I would have guessed that you'd be fine at designing competent power supplies for your products.
It is very challenging: in order to power amps with zero output resistance he would ned power supply with zero output resistance, powered through a zero resistance power cable from zero resistance outlet. But adding 0.1-0.5 Ohm resistor in series with speaker he allowed some resistance for power cable and outlet. Sounds quite scientific, right?
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Old 11th December 2011, 09:45 PM   #19007
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You are wrong, SY.
OK, so you can't design power supplies.

Sorry, I think you're being overly modest.
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Old 11th December 2011, 09:51 PM   #19008
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Wavebourn, don't you hear the difference in line cords?
Possibly some designer are satisfied with only measurements, while skipping listening evaluations.
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Old 11th December 2011, 09:55 PM   #19009
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Possibly some designer are satisfied with only measurements, while skipping listening evaluations.
Possibly you don't mean my humble person, Joshua?

As people know, I always calibrate measurements with listenings, and listenings with measurements. You know, it helps sometimes more than correlating thinkings with readings.
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Old 11th December 2011, 10:00 PM   #19010
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Quote:
Originally Posted by Wavebourn View Post
It is very challenging: in order to power amps with zero output resistance he would ned power supply with zero output resistance, powered through a zero resistance power cable from zero resistance outlet. But adding 0.1-0.5 Ohm resistor in series with speaker he allowed some resistance for power cable and outlet. Sounds quite scientific, right?
Last I heard, RF entering an amplifier via the power cord, spreads also by radiation, bypassing the power supply. But what do I know? I have no formal degree to backup any technical claim.

However I'm curious why Thorsten Loesch bothered to put a special AMR fuse in the CDP I purchased recently. Was the fuse chosen after certain measurements? Or may be after listening evaluations? Is that special fuse only for show? I doubt it, since most customers don't bother to take out the fuse and look at it.
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