This one isn't highly technical, and was originally written as a handout for PreSonuSphere 2013 (so PreSonus headphone amplifiers are the first examples). In this article, I attempt to clarify the differences between headphone amplifiers that might look pretty much the same from arms length, primarily in how inputs are routed to outputs and how (and if) multiple inputs can be mixed. Hope some of you will find it helpful. Here's the
direct link to the PDF.
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