Overview
 
The 6.6' Sennheiser Cable-II-X3K1-Gold is a straight copper cable with XLR and 1/4" connectors designed for use with select Sennheiser HMD and HME headsets in broadcast and communications applications. With a proprietary connector at the headset end and XLR 3-pin and 1/4" jacks at the other, it is compatible with HMD 300/301 Pro, HMD/HME 26-II, and HMD/HME 27 Pro headsets.

It utilizes copper wire and gold-plated contacts to enhance conductivity while maintaining a flexible shield. A coiled section reduces handling noise and the aramid reinforcement delivers increased durability.
 
Compatible with HMD 300 Pro, HMD 301 Pro, HMD 26-II, HME 26-II, HMD 27 Pro, and HME 27 Pro headsets
Straight copper cable with coiled segment to eliminate structure-born noise
Reinforced with aramid for improved durability
Softer shield enhances flexibility