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I don’t know if this will really help you in this situation, but you have to have a speaker connected to do the battery test. If polarity is correct the woofer driver will move forward. Typically a 9v battery is used, which is a lot of voltage for a speaker, so don’t leave it connected for more than a few seconds.
Any reason why you can’t just pull the speaker jacks out and see how they were connected? Even if the jacks were not labeled on the back, the speaker cable should have some kind of indicator on it. That’s all you need.
Regards,
Wayne A. Pflughaupt
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