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Joseph Grado HPA-1

Joseph Grado HPA-1

“Background   In about 1990, when Joseph Grado was designing his HMP-1 Holographic Scalera Scanner (perfectly-matched pair of microphones for recording), he needed some detailed, neutral headphones to diagnose the HMP-1 performance, so he developed the Joseph Grado Signature Products HP-1000 headphone (three versions- HP-1, HP-2, and HP-3).  His headphones came with instructions for...” --kayandjohn

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