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Description
Sennheiser Headset Cable X3K1, Copper Cable for Broadcast Boomsets, 2m,XLR-3 Connector, 6.3mm Jack PlugSennheiser HEADSET CABLE X3K1 (Cable II X3K1) Professional Broadcast Headset Cable The Sennheiser Headset Cable X3K1 (Article Number: 700427, Legacy: 505782 508546) is a premium, heavy duty replacement master connection cable engineered exclusively for Sennheiser's professional broadcast boomsets and monitoring headsets. Spanning exactly 2 meters (6. 6 feet) in length, this dual shielded copper cable acts as the primary hardware interface between an
Sennheiser HEADSET CABLE X3K1 (Cable II-X3K1) Professional Broadcast Headset Cable
The Sennheiser Headset Cable X3K1 (Article Number: 700427, Legacy: 505782 / 508546) is a premium, heavy-duty replacement master connection cable engineered exclusively for Sennheiser's professional broadcast boomsets and monitoring headsets. Spanning exactly 2 meters (6.6 feet) in length, this dual-shielded copper cable acts as the primary hardware interface between an announcer's headset and an electronic news gathering (ENG) field mixer, production truck terminal, or master control console.
The "X3K1" designation outlines its exact termination configuration: the shared single-sided headset connector runs down a straight line and splits cleanly at the tail end into a standard 3-pin XLR-Male connector for the microphone circuit, alongside a 6.3 mm (1/4") TRS jack plug for stereo headphone monitoring.
Key Structural and Engineering Attributes
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Aramid-Fiber Reinforced Core: Braided internally with heavy-duty Aramid (Kevlar) reinforcement strands. This structural core significantly increases the cable's tensile strength, preventing inner copper lines from snapping or stretching when subjected to sudden tugs on a chaotic sideline or live stage set.
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Integrated Anti-Microphonic Coiled Segment: Features a short, precision-engineered coiled element located immediately below the proprietary headset plug interface. This acts as a mechanical shock buffer, intercepting clothing friction, physical handling vibrations, and structure-borne noise before they can travel up the jacket and introduce low-end rumble to the audio feed.
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Highly Flexible Soft Shielding Layout: Outer-jacket wrapped in a specialized, highly tactile polymer matrix. This design keeps the twin-parallel cable assembly completely flexible and resistant to tangling or looping, even when deployed under extreme temperatures in cold field-broadcast booths.
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Gold-Plated Contact Interface pins: Both the 3-pin XLR-Male mic barrel and the 1/4" phone plug are treated with heavy gold electroplating. This maximizes signal conductivity, lowers contact resistance, and provides complete protection against atmospheric corrosion and oxidization over years of field abuse.
Technical Specifications Matrix
| Feature Parameter | Hardware Specification Profile |
| Model Reference Name | Headset Cable X3K1 (CABLE II-X3K1) |
| Official Article Number | 700427 (Current) / 508546 / 505782 |
| Global Trade Product Code (UPC) | 615104246300 |
| Primary Cable Composition | High-purity multi-strand copper with internal Aramid reinforcement |
| Total Physical Cable Length | 2.0 Meters (6.6 Feet) |
| Headset-Side Connection | Sennheiser Modular Multi-Pin Matrix Terminal (with locking screw mechanism) |
| Microphone Signal Termination | 1 x 3-Pin XLR-Male Plug (Balanced line configuration) |
| Headphone Signal Termination | 1 x 6.3 mm (1/4") TRS Stereo Jack Plug |
| Jacket Compound Build | Non-reflective Matte Black Elastic Polymer |
| Net Structural Weight | Approx. 106 grams (3.73 oz) |
Master Headset Compatibility Profile
The X3K1 modular terminal architecture is engineered to attach flush onto the single-sided connection points of the following Sennheiser professional broadcast lines:
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HMD/HME 26 Series: HMD 26-II-600, HMD 26-II-100, HME 26-II
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HMD/HME 27 Series: HMD 27 PRO, HME 27 PRO
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HMD 300 PRO Series: HMD 300 PRO, HMD 300 X3K1, HMD 301 PRO
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(Note: Not compatible with legacy HD 25 series variants that use alternative pinned layout configurations).
In the Box: Component Inventory
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1 x Sennheiser Headset Cable X3K1 (2m Cable Terminated to XLR-3 / 1/4" Jack)
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1 x Replacement Miniature Mechanical Mounting Screw
Installation and Field Management Advice
Securing the Headset Anchor Screw: When mounting the X3K1 cable terminal into your compatible headset cup assembly (such as an HMD 26-II or HMD 300 PRO), align the multi-pin array carefully and push it firmly into the receiving slot. Once seated flush, use a small precision screwdriver to lock the included miniature anchor screw into place. Do not over-torque this screw to avoid cracking the plastic headset chassis—tighten it just until it sits hand-tight to keep the cable from tearing loose during intense field movement.
Dynamic Microphone vs. Active Phantom Power Safety: If you are running an HMD 300 PRO or an HMD 26-II headset utilizing this cable, keep in mind that these boomsets feature a high-performance dynamic microphone capsule ($40\text{ Hz}$ to $18,000\text{ Hz}$, hypercardioid/supercardioid). Dynamic elements do not require power. While standard professional audio consoles isolate the XLR lines safely, some older field-recording hubs or intercom boxes with faulty grounding loops can introduce audio artifacts or mild signal clipping if 48V phantom power is left active on that channel. For the cleanest, lowest-noise signal path, manually deactivate the 48V phantom power switch on your mixer's incoming headset microphone channel strip.
Shipping Notes
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Exchange/Return Notes
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