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My Koss Porta Pros, before and after

We tested Koss's lifetime warranty on all headphones purchased after July 1989, and it still holds true.

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Justin Yu
Justin Yu covered headphones and peripherals for CNET.
Justin Yu
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1 of 3 Justin Yu

The wire on my old personal set of PortaPros began to fray after several years of daily use. The plug is a typical area of strain for headphones.

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2 of 3 Justin Yu

The wire on my old personal set of PortaPros began to fray after several years of daily use. The plug is a typical area of strain for headphones.

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3 of 3 Justin Yu

Two weeks after shipping them out to Koss with a $6 check and all relevant information enclosed, I received a new pair!

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