Grado offers a mini adapter cable that converts a 1/4 inch (6.3mm) plug to 1/8 inch (3.5mm) plug. The mini adapter cable has a 1/8 inch (3.5mm) plug then 8 inches (20cm) of cable connected to a 1/4 inch (6.3mm) jack. The 8 inches (20cm) of cable eliminates added leverage on the output circuit board of the source. The mini adapter cable is constructed of the same high quality wire as their headphone cable. Grado guarantees no degradation of sonic quality with Grado headphones while using their mini adapter cable.