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I saw this article on ProSoundWeb.com and thought you might be interested. What’s Under The Hood? Power Amplifier Sections, Connectors & Classes http://www.prosoundweb.com/article/whats_under_the_hood_power_amplifier_sections_connectors_classes/ A power amplifier is not just a black box that makes signals stronger; rather, this complex device has a number of functional sections, connectors and circuit classes that differentiate one model from another.