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Foundation SX Headphone Cables



VAT Included


Free delivery in UAE

Foundation SX headphone cables are handmade in our California factory from core Synergistic Research technologies, including handmade Air String Geometries made or pure 99.9999% Pure Silver conductors in an Air Dielectric for unmatched resolution. We then add UEF Matrix Shielding with a new UEF Compound first developed for our SRX cable loom for a dramatically lower noise floor.


Next we include a new Long Duration High Voltage Conditioning Process, initially engineered for our flagship SRX cables, making Foundation SX the most musical and highest resolution headphone cables you can buy.


With a full suite of SR Technologies, you hear inner detail and holographic realism that’s never harsh or fatiguing, unlike most pure silver-based cables. And to make voicing them to your headphone rig easy, we include UEF Carbon Tuning discs to strike the perfect balance of musicality and resolution. In short, we’ve created the world’s best headphone cables, and we’re confident you’ll love their sound over ANY headphone cable on the market, regardless of price.


So step up, take the Foundation SX Challenge and discover how good your current headphone system actually is.

Source Connections

Destination Connections





4 each Silver Air String:

  • Silver Air Strings: 99.9999% pure monocrystal silver conductor
  • 4 separate conductors
  • Dielectric: Air (sealed)
  • Shielding: Silver Braid -Quantum Tunneled


Source Connectors:

  • Neutrik 4 PIN XLR
  • 3.5mm with 6.35mm (1/4″) adapter


Destination Connectors:

  • 2 Pin Lemo
  • 3 Pin Lemo (Focal Utopia)
  • MMCX ( Pioneer SR-Master1: Shure SRH1540 and SRH1840)
  • Sennheiser Push-Pull (Sennheiser HD820, HD800S, and HD800)
  • Sennheiser 2 Pin (Sennheiser HD650, HD600, HDXX)
  • Mr.Speakers 4 Pin Hirose (MrSpeakers: Aeon, Ether 2, Ether 2 Closed, Flow, Flow closed
  • 4 Pin Mini XLR (Audeze LCD4,3,2,X, XC: Meze Empyrean: ZMF Atticus, ZMF Eikon)
  • 3 Pin Mini XLR
  • 2.5mm Mono (Hifiman Old Styles)
  • 3.5mm Mono
  • 3.5mm Stereo (Hifiman current: Ananda, Susvara, HE1000, HE400i, HE500, HE6 and HE650)
  • 8 Contact
  • SMC
  • TRRS (2.5mm and 3.5mm)

Always confirm your connections with your headphone manufacturer.
Additional connections may be available upon request.


Build Notes:

  • 12 point-to-point hand soldered connections
  • Atmosphere Level 2 UEF Matrix Shielding: UEF coating with Graphene is applied directly to connectors significantly reducing the noise floor and allowing a purer signal to transfer with less grain providing more warmth and detail
  • Silver Solder: 4%
  • Hand build time: 2 hours
  • Quantum Tunneling: Post Production process, 1 million volts are passed through finished cable providing a “canal” that allows electrons to pass more freely through conductor material and connections
  • Secondary UEF Blue Treatment originally developed for SR Blue Fuses
  • 5 day Burn-in: 2 step process
  • Hand crafted in our California factory
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