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Grado Labs's Extension Cable
Headphone Accessories by Grado Labs
offers a 15 foot (450cm) extension cable terminated with a 1/4 inch (6.3mm) plug and a 1/4 inch (6.3mm) jack. This cable is constructed from the same high
quality wire as their headphone cable. For longer lengths the cable may be piggybacked up to 3 cables. Grado
guarantees no degradation of sonic quality with Grado headphones while using their extension cable.