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If anything, it’s actually fluctuations in the supply voltage - which do occur - that could make a detectable difference.
Anyway, what would you do if the amps had hardwired power cables?
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Some things simply don’t affect the outcome of an experiment, so can be ignored.
And again, what do you do about amps with hardwired power cables?
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
A guitar amp power cable comes in two types however, and those are Broken and Not Broken. I get the scientific method bit, but the power cable is not a variable, the same stuff comes out of the end and into the amp whatever.
Someone accused me of being rude the other day for asserting (quite politely in fact) that mixing up treble bleed and treble pass is not a matter of opinion, so I have to leap to @ICBM 's defence and say that accuracy is not condescencion, it's just accuracy.
And I’m asking, again, what you do if the amps have hardwired power cables? Many do, although it’s becoming less common. Please answer this before telling me I’m wrong again.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Nil Satis Nisi Optimum
The point I'm trying to make is that when comparing two items it is scientifically correct to standardise all ancillaries so that it is just the items under scrutiny. As I have said, I accept that there is likely no difference, BUT using the same lead eliminates the question mark.
Best analogy I can think of is performance testing a similar specced VW Golf against a Ford Focus. I think "petrolheads" would invalidate the result if it was discovered that one car used Texaco 95RON and the other used Shell 95RON. The fuel may well have come from the same refinery even, BUT it is a difference that "could" have some influence on performance.
I see that @Rocker has come back to reiterate similar too.
I still maintain that for ideal side by side testing, potential (no pun intended) variables have to be eliminated. I'm sure you'll have read my earlier reply to @p90fool .
With regard to hard wired amplifiers then that is a fixed component of that amplifier. If the other amp has a kettle lead arrangement then it is important to use the supplied lead so that the amps are being compared "out of the box".
That isn't a problem, because there is NO DIFFERENCE.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein