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DaveP
Active member
USPS Large Flat rate box fit a 12" speaker exactly. Sometimes you just need to add an additional piece of cardboard folded on the magnet side to keep it secure, then put that box into a 14x14x14 and cut it down to size depending on if your shipping one or two speakers. Add additional packing material around the inside boxes and your all set. I shipped a lot of speakers and never had a problem yet.