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This isn't really new. But still, it's something people ask when they are new to the hobby. So I figured making a short video explaining how to use a battery to check polarity might be useful now and again. It would've helped me when I first started.

 

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Useful. What about tweeters?
free audiocontrol app with either bluetooth audio or aux audio connection will give you a read for tweets and mids, didn't seem to work great for a sub, probably iphone mic limitations.

tweeters you should try both ways though, sometimes one or both can be reversed polarity to help the soundstage.
 
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