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Post by hostility on May 1, 2022 7:37:08 GMT -5
I’m sure this has been asked a bunch here before but I’m just stumbling across this now, where the xpa xlr amps have reverse pins.
Now I’m using an avm70 processor, xpa2 gen 2 for my left and right, xpa 5 gen 1 for centre, sides and rears, and the basx a700 for front wides and 4 atmos. My xpa amps use xlr, the basx amp I’m using xlr to rca cable. Do I need to switch my speaker wires around? For fun yesterday I switched my one front wide speaker cables around as they are easy to get at, but heard no difference listening to only my front wides and left and right mains. I’m a little confused if I need to do any changes or leave it.
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Post by hostility on May 5, 2022 5:04:25 GMT -5
Anyone?
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Post by doc1963 on May 5, 2022 6:02:51 GMT -5
Yes… every XPA series amplifier going all the way back to the original Gen1 have pins 2 and 3 wired in reverse at the XLR inputs. Aside from using the XPA's unbalanced inputs (which do maintain proper electrical phase) rather than using XLR, the easiest solution to correcting the electrical phase snafu of the XLR inputs is to reverse the positive/negative speaker wire connections at the back of the amplifier. Your BasX A700 isn’t affected in any way and is already “in proper phase” when wired normally. I use all Emotiva amplification (all using XLR inputs) and while I don’t need to do this (since all of my channels are in the same electrical phase), I do it anyway just for my own personal peace of mind…  |
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Post by hostility on May 5, 2022 9:57:27 GMT -5
Yes… every XPA series amplifier going all the way back to the original Gen1 have pins 2 and 3 wired in reverse at the XLR inputs. Aside from using the XPA's unbalanced inputs (which do maintain proper electrical phase) rather than using XLR, the easiest solution to correcting the electrical phase snafu of the XLR inputs is to reverse the positive/negative speaker wire connections at the back of the amplifier. Your BasX A700 isn’t affected in any way and is already “in proper phase” when wired normally. I use all Emotiva amplification (all using XLR inputs) and while I don’t need to do this (since all of my channels are in the same electrical phase), I do it anyway just for my own personal peace of mind… Instead of reversing all my channels on the xpa amp, would it work for me to reverse the leads on my a700 amp as it would be easier? Or just do it on my xpa amps? Would I need to re run room correction after doing this or no because it’s only measuring a single speaker at a time? |
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Post by doc1963 on May 5, 2022 10:20:17 GMT -5
Yes… every XPA series amplifier going all the way back to the original Gen1 have pins 2 and 3 wired in reverse at the XLR inputs. Aside from using the XPA's unbalanced inputs (which do maintain proper electrical phase) rather than using XLR, the easiest solution to correcting the electrical phase snafu of the XLR inputs is to reverse the positive/negative speaker wire connections at the back of the amplifier. Your BasX A700 isn’t affected in any way and is already “in proper phase” when wired normally. I use all Emotiva amplification (all using XLR inputs) and while I don’t need to do this (since all of my channels are in the same electrical phase), I do it anyway just for my own personal peace of mind… Instead of reversing all my channels on the xpa amp, would it work for me to reverse the leads on my a700 amp as it would be easier? Or just do it on my xpa amps? Would I need to re run room correction after doing this or no because it’s only measuring a single speaker at a time? Sure... You can do whichever is easier. Both would achieve the same goal of matching the absolute phase of every channel. And yes, after doing this, I would run your room correction software again just to be sure you're getting the best results. But FWIW, without knowing much about Anthem's ARC Genesis, I don't know that any of this is necessary as ARC might have already compensated for (and corrected) any anomalies in acoustic phase that may have been caused by the original snafu. If it were me, and everything already sounds "normal" and I'm happy with what I'm hearing, I'd leave well enough alone. I only do what I did because I knew about this XLR pinout issue years ago and it was easy enough to compensate for when I installed my newer amps. That, and then never having to worry about OCD kicking in afterwards...  |
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Post by ttocs on May 5, 2022 10:23:52 GMT -5
^^^^ What he said. The correction app may have corrected the phase, so if you decide to flip the speaker wires, rerun the correction app.
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Post by hostility on May 5, 2022 19:52:39 GMT -5
Awesome thanks guys. I don’t think arc does check the absolute phase. I might just do it as it’s easy to access and re run room correction.
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