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Dual Senn. 2-pin headphone cable for HD Series (600, 6XX, 58x & more) – Hart Audio Cables
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4-Pin XLR Balanced Cable for Sennheiser HD 650, 660 S, 600, 6XX, 58X, Headphones | eBay
4.4mm to 4.4mm Cable by iFi audio - An audiophile grade interconnect for your balanced components.
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