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I saw this article on ProSoundWeb.com and thought you might be interested. Understanding Target Sound Pressure Level And Required Amplifier Size http://www.prosoundweb.com/article/understanding_target_spl_and_required_amplifier_size/ Examining a method to help determine the required amplifier size so that a given loudspeaker reproducing a given signal may achieve a target SPL at a specified distance, and an example of how to calculate this