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[Ivan Beaver]

Using heavy gauge Pig Hog brand cables which have hard plastic encased ends. Quality cable but I have to assume they are properly wired as the ends can not be opened to inspect.

An ohm meter and a couple of seconds will tell you if the cable is wired correctly

[Michael Lawrence]

You could also use free software such as Room EQ Wizard to run sine sweeps (or Smaart if you have it) , then overlay all the phase traces. I do this as part of a routine bench test, and also to check boxes before an install.

SynAudCon- Line Array Checkout

[Tim McCulloch]

You could also use free software such as Room EQ Wizard to run sine sweeps (or Smaart if you have it) , then overlay all the phase traces. I do this as part of a routine bench test, and also to check boxes before an install.

SynAudCon- Line Array Checkout

Probably overkill for the simple test the OP needs.

[Michael Lawrence]

Probably overkill for the simple test the OP needs.

Probably. Depends how many boxes there are, I suppose.

[Stu McDoniel]

There are a few apps for android phones

JBL tools app has a polarity check

Polarity tester is another app

Youtube has pulses

[ProSoundWeb Community]