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More info...
. "Will reversing the speaker wire at the amp end have ANY side effects or negative impacts on the AMP/Speakers/Sound or anything in the chain?"
No.
Longer answer: In practice it will not matter. There are those who claim to hear absolute polarity, but (a) not all source material maintains absolute polarity, (b) sound is an AC signal so you won't hear it anyway, and (c) your AVR or pre/pro will automatically compensate for it whether you swap wires or not. Swap if it makes you feel better but the end result will be the same.
Aside: There used to be differences among continents and regions but for some time now (many years) everyone has followed the same convention with respect to XLR pin-out.
Το κάνουν λέει για χαμηλότερο θόρυβο...No.
Longer answer: In practice it will not matter. There are those who claim to hear absolute polarity, but (a) not all source material maintains absolute polarity, (b) sound is an AC signal so you won't hear it anyway, and (c) your AVR or pre/pro will automatically compensate for it whether you swap wires or not. Swap if it makes you feel better but the end result will be the same.
Aside: There used to be differences among continents and regions but for some time now (many years) everyone has followed the same convention with respect to XLR pin-out.
.
Just out of curiosity I asked Emotiva to confirm how they wire the connectors on their amps, and this is the response I received a few minutes ago from their tech support:
"All Gen 3 amps are pin 3 hot, pin 2 cold (out of phase). If using with Marantz XLR outputs, flip the negative and positive speaker wire leads at the amp (hook them up backward). "
So that is why when I ran Audyssey with a Marantz amp I have it was reported that all of my speakers were out of phase. Interesting.
EDIT: After getting the above response, I asked if there was some reason for the doing it this way. Their answer was:
"It was too technical for me to understand. I asked engineering one day and he told me the technical reason why it lowers the floor noise to do it this way, and he lost me. This has been several months ago and I don't recall the specifics. But it does help with the floor noise to flip the incoming phase. "
[ /QUOTE]