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beyerdynamic DT 440 Premium Headphones Review beyerdynamic DT 440 Premium Headphones Feature Open-back headphone with detailed audio reproduction and balanced sound Powerful bass and extended highs with 10 Hz to 35 kHz frequency response 90-degree swiveling ear cups, rugged headband, and replaceable ear pads Fold-away design for easy storage and transport 1/8-inch stereo mini jack [...]