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Message: <blockquote data-quote="hispls" data-source="post: 8726665" data-attributes="member: 614752">It is not something where they take  a speaker in a laboratory, put 1W into it and measure SPL.  It's a number that's calculated when you pull TS parameters.  The key things to ask when you see this spec are "at what frequency?", "what about all the other frequencies?" and "by what method?".  You will likely not be able to come up with good answers for these questions because the frequency at which this is predicted may not even be within the bandwidth you intend to use the driver, and without knowing the method used to calculate it may not compare apples to apples with products from another manufacturer who uses a different method.   For our purposes in car audio I do not think many folks take that number too seriously.</blockquote>

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