Meltzer Counts on Sennheiser adidas PMX 680 for Sound Clarity, Durability and Comfort Ultrarunner Karl Meltzer prefers the Sennheiser PMX 680 Sports headphone for its sound quality, comfort and durability (click on image for hi-res. Photo credit: T Martens) Old Lyme, Conn., – February 1, 2012 – For ultrarunner Karl Meltzer, a 100-mile run...
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