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Archimago's Musings: MEASUREMENTS: Sennheiser HD650 (~2010-2012) and HD800 (~2010). A comparison of two "Reference Class" headphones, and a look/listen to the "Sennheiser veil / darkness". [Inexpensive 2TB SSD and inflation in consumer electronics...]
Sennheiser HD 650 review
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Amazon.com: FAAEAL HD650 Balanced Cable,Replacement for Sennheiser HD600 HD660S HD6XX HD580 HD58X HD545 HD535 Headphones, 2.5mm Balanced Male Jack Extension Aux Cord, 4.9ft : Electronics