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General speaker questions for audio and home theater.

RE: 8" versus 10" versus 12" versus 15"

Actually, a 12-inch speaker is really a 9-inch speaker for the purposes of moving air because the diameter of the moving diaphragm is only 9-inches. Therefore, measuring to the outside of a speakers basket might be good for designating speaker size, but it is not the correct measurement to use for calculating SPL. That's all I'm saying.

Consequently, I would need to see the algorithm in the SPL calculator in order to understand how it works and which speaker size designation to use.

Best regards,
John Elison


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