Subwoofer polarity issue ?

Today i build subwoofer box and at the moment when i was connecting negative and positive wire on sub terminal i did not noticed that am i connecting correct . Now red wire is in positive terminal of amp and black one is in negative . I don't want to pull out sub from box as it will consume time and maybe... show more Today i build subwoofer box and at the moment when i was connecting negative and positive wire on sub terminal i did not noticed that am i connecting correct . Now red wire is in positive terminal of amp and black one is in negative . I don't want to pull out sub from box as it will consume time and maybe fitting will not remain that tight . So is there any way to confirm that subwoofer is connected right or opposite ?
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