Gold Plated 2 Poles Mono Jack 2.5mm Connector Ø4mm Silver for Sennheiser HD700 (Pair) - Audiophonics
Sennheiser Momentum 3 Wireless - The Official Thread | Page 19 | Headphone Reviews and Discussion - Head-Fi.org
Sennheiser 3.5mm Jack Plug Microphone Adapter To 4 Pin Hirose Audio Technica ATW | eBay
Buy Geekria QuickFit Audio Cable Compatible with Sennheiser HD 560 S, HD599, HD598, HD 598SE, HD 598CS, HD 598SR, HD579, HD569, HD400 PRO Cable, 2.5mm Jack AUX Replacement Stereo Cord (6 ft /
Geekria QuickFit Audio Cable Compatible with Sennheiser HD 560 S, HD59
DIY Audio Electronics from Zynsonix.com: Headphone Connectors & Pins / Pinouts for DIY