Benefitting from learnings upon the development of our flagship SRX XL cable line, SR’s new Foundation SX XL interconnect cables deliver notably improved performance above the Foundation SX series and continue to be offered at attractive price points. While the line as a whole can be thought of as an evolution from the Foundation SX, the cable has been rethought holistically, applying the same improvements made to SR’s new flagship SRX XL cable series.

For each cable type, SR doubled the 6N pure silver Air Strings to portray music with more immediacy and resolution, improving upon dynamics and transient response in a completely non-fatiguing way. We apply the same SRX XL UEF compound as described above to improve shielding. And finally, the cables are run through the same SRX XL High Voltage Conditioning treatment uses for SR’s flagship SRX XL cables.

With Foundation SX XL, you’ll notice an improved dynamics and a more natural timbre, all with a reduction in noise floor to keep details of the music smoother and more realistic than its predecessor.

SRX XL Matrix Shielding

In their journey to design our latest flagship SRX XL series, SR developed an entirely new UEF compound to elevate the performance of their previous Matrix Shielding, which further lowers each cable’s noise floor while lessening restraints a shield may have on signal transmission. SR applies this highest level of SRX XL Matrix Shielding to our new Foundation SX XL cables for a significant jump in performance over the previous generation Foundation SX. Carbon Fiber UEF Tuning Discs developed for the Foundation SX and Foundation SX XL series cables further refines and enhances the loom’s ability to cancel noise that would otherwise cause high frequencies to sound harsh or fatiguing.

6N Pure Silver Airstrings, Multiplied

While voicing the Foundation SX XL, SR found that doubling the 99.9995% Pure Silver Airstrings resulted in a cables that are faster and more resolving, adding texture and body while improving dynamics and transient response without adding fatigue.

SRX XL High Voltage Conditioning

The new SRX XL High Voltage Conditioning is SR’s most advanced process for treating cables with 1,000,000 volts of electricity at specific frequencies and pulse modulations for long durations, creating a canal in the conductor material and contact points at the molecular level that allows electrons to flow more freely. This new process improves upon the SRX High Voltage Conditioning process by employing new extended duration sweeping frequency plots and advancements to SR’s Tesla Coil, resulting in SRX XL cables to sound even more open and accurate than the cables before them. For Foundation SX XL, we utilize this exact conditioning process, which we found to contribute to the large performance improvement in this series, bringing the voicing of the Foundation SX XL closer to that of the SRX XL.