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Message: <blockquote data-quote="......." data-source="post: 7299794" data-attributes="member: 628410">You calculate cone area by using this formula (PI x Diameter x Diameter) / 4. So for 3 12s you'd have approximately 339.29 square inches of cone area, 2 15s would give you 353.43. There isn't a huge difference but plenty of people on here would run 2 15s over 3 12s for various reasons.It's not 100% accurate because it doesn't take surround area into effect for one, plus the formula's a little different for square speakers. It's a great time saver and easy way to get an idea of how much cone area you have.</blockquote>

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