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Sennheiser Adapter 3.5mm - 6.3mm Jack for HD 25 | MUSIC STORE professional
Amazon.com: Mobi Lock 3.5mm Plug to 6.35mm Socket (Pack of 2) 1/8 to 1/4 inch Stereo Audio Jack Adapter | Connects Devices with 3.5mm Port to Your Amplifiers, Guitar, Piano, Speakers &