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Sennheiser HD 25/HD 25 SP Headphone Adaptor Mini Jack To Jack Connector Plug | Reverb
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Sennheiser Universal 1/8" to 1/4" Headphone Adapter 549346 B&H
Amazon.com: 2.5mm Male to 3.5mm Female Audio Adapter Earphone Converter , 2.5mm to 3.5mm Headphone Adapter, for Technica ATH M40X ATH M50X, for Sennheiser HD518 HD558, etc : Electronics