ANY modern equipment power supply will not be affected by the normal variables presented by a home user. Period. Anyone thinking adding a different power cord or fuse to the system will help in any audible way is deluding themselves. Period. But hey, if that's what makes a person happy then I say they should do whatever they like to do and be happy.
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My 2¢
Ya know…
I have learned that absolutist statements usually don't withstand the test of time.
And it is quite apparent that for you these statements are absolutely true and hold true to the extent that you are willing to dismiss any and all other experinces and opinions.
And that certainly is your prerogative.
And perhaps you will come to experience that other's experiences are equally as valid and true for those who have them (think quantum mechanics).
But there are also the consequences in holding fast to seemingly 'inviolate' truths, without investigation along with the requisite curiosity sufficient to experience, for yourself, the validity (or lack of same) of these very same truths.
I have in my system and in other systems as well, demonstrated and shown that in certain conditions where fuses and power cables etc. DO make a noticeable change, and in most cases for the 'better'.
This has motivated me to continue my research into what other factors are involved.
This is an ongoing research project that has yielded much additional insight into why and what is going on and helps to explain, at least for me, why I hear changes, where according to the 'standard understanding' these sorts of things simply can't happen.
Only they do and not just for me but others as well.
Which leads me to why I am writing this post in the first place.
And it isn't meant to denigrate nor demean your opinion, not in ths slightest.
But when I run across opinions that run counter to my experiences garrnered over decades which are being stated as absolute truth, well my ususal response is to just ignore them and log the obvious observation that they simply don't have the direct experience, for whatever reason.
And much like my recent post about the inability at proving a negative, a lack of experiencing something does not make for a true proposition.
And I do value some of your perspectives on audio which are based upon your experiences.
But in the past, my reaction to these sorts of statements is to just shake my head and move on.
But this time I thought I'd provide some feedback, for what it's worth, which for you might be way less than 2¢.
So feel free to dismiss and relegate my opinion to the trash heap since my experience doesn't agree with yours.
And the old addage of confirmation bias simply doesn't withstand scrutiny, since the only measure we have for determining if the SQ does in fact change (or not) is thru our individual subjective experience.
Because that is all we have, when it comes down to it.
Is it better?
Is there no change, or is it worse?
We each make that determination for ourselves, based upon our direct personal experiences.
My hope is that some day you will hear a difference which just might trigger your curiosity enough to investigate further, much like what I am doing.
And lastly there is this quote from long ago which seems to apply here.
"There is a principle which is a bar against all information, which is proof against all argument, and which cannot fail to keep a man in everlasting ignorance.
This principle is, contempt prior to examination."
William Paley 1785
JJ