Amazon.com: gotor 4.4mm Balanced Replacement Cable for Sennheiser HD 650 HD 660s HD 600 HD 6XX HD 25 HD 580 HD 58x 7N Silver Plated Copper (1.2m(3.9Feet)) : Electronics
GENUINE SENNHEISER Replacement Short Cable for HD650 HD600 HD 580 565 open box | eBay