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Sennheiser HD 660s2 versus Sennheiser HD 650, which is the better Sennheiser headphone for you? - YouTube
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Amazon.com: Sennheiser Consumer Audio HD 650 - Audiophile Hi-Res Open Back Dynamic Headphone, Titan : Everything Else
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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...]
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