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@rskmd – you may wish to focus on the free CTA standard paper. It really is a good one (and free, unlike the CEA 2010 A 2012 or the CEA 2010 B 2014, which cost $60 and $90 respectively at ANSI (didn’t check CTA’s website). https://shop.cta.tech/products/standard-method-of-measurement-for-subwoofers