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re: Car Audio - amp outputs polarity?
Posted on 5/6/23 at 3:33 pm to mdomingue
Posted on 5/6/23 at 3:33 pm to mdomingue
There isn’t any big issue really, I was actually troubleshooting something else (lost blinker sounds, fixed by adding Load generating device).
Im getting sound out of all speakers.
Ive confirmed that polarity is swapped because when installing my front right speaker today, with it wired correctly the woofer pushes in rather than out. And when i hook it up backwards the woofer pushes out correctly.
I understand the amp sends AC sine waves to speaker but my multimeter doesn’t tell me positive or negative with AC.
Im getting sound out of all speakers.
Ive confirmed that polarity is swapped because when installing my front right speaker today, with it wired correctly the woofer pushes in rather than out. And when i hook it up backwards the woofer pushes out correctly.
I understand the amp sends AC sine waves to speaker but my multimeter doesn’t tell me positive or negative with AC.
This post was edited on 5/6/23 at 3:34 pm
1
Posted on 5/7/23 at 9:00 am to jyoung1
Easy way to check polarity - touch a 9V battery to the speaker wires. Make sure all speakers push in or out the same direction when connected to the battery +/- terminals. (also very handy to identify speaker wires if you have a big jumble of them)
The amp output is AC, your readings with a DMM will not mean much at all, as it is not fast enough to catch the rapid changes in frequency / amplitude. If you have an oscilloscope you could see it.
Rock on!
The amp output is AC, your readings with a DMM will not mean much at all, as it is not fast enough to catch the rapid changes in frequency / amplitude. If you have an oscilloscope you could see it.
Rock on!
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