Unlike the diaphragms I’m replacing, the new OEM diaphragms have no evident polarity marking. Each lead has a small black band on it, but that just seems to be from manufacturing. Battery testing doesn’t move the diaphragm sufficiently to determine whether it’s going inward or outward.

I do see inside the voice coil that one lead is different from the other (it wraps around), but that doesn’t tell me which is which.

Is there some clue I’m missing swing, like maybe the number stamp location?

Is it sufficient if I just make sure both diaphragms are in phase? Since I can see where one of the leads wraps around, I guess I could just do that.

Speakers are L300s; tweeters are 077s.

Thanks.

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