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Until you try it, how can you possibly know one way whether or not it has an effect?
Ok sorry, I can't possibly know.
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The only thing that defy logic is people claiming something won't change the sound even before trying it,
huh? what in the world are you saying?
using logic means I can say.. "i can come to this conclusion, because this, this, this, this and this is true"
Its not foolproof, but its how I get by in my daily life.
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changing elements are a part of the fun, a safe and easy way to possibly improve the sound and sometime just a way to spend their money to own something supposely "better".
Why a power cable idea is crazy when it is almost completely accepted by everyone that capacitors (like all elements) color the sound ?
Just unplug your power cable and realise how important this element is.
If you have fun doing it, by all means. I can't exactly say its my definition of fun though.. and I certainly wouldn't pay for it =/
Most people that actually know what a capacitor does, and how to implement them correctly compares them in crossover networks, DC blocking position, or in some other application directly in the signal path. Capacitors have measurable data concluding that they do degenerate the original signal. Also, the capacitor they review are not following 5000 other crappier capacitors right before it. thirdly, a signal that goes through a capacitor isn't rectified, filtered, regulated, "cleaned up" right after it goes through the capacitor (else you'll just damage your headphones). fourthly, fifthly, sixthly, seventhly and eightly - you're not listening to the power supply, the psrr of a equipment measures how much of the power supply noise is attenuated, "I'm not even going to get into the cable debate", not accepted by everyone, power cable manufacturers don't actually know what makes a power cable "sound better", and capacitors used in a circuit more often times than not is purposefully intended to change the signal, where cables are typically not designed to change the signal.
Even comparing power supply capacitors, you can use half the points I posted above.