The Supra EFF-ISL is a Supra bestseller when it comes to high end signal cables. EFF stands for "Equalized Frequency Flow technique", and ISL is how the cables is used eg. RCA  plugs.

One of the unique characteristics of these cables is the way they handle sound. They are very transparent and you get all the details in your sound, without any impact in the sound you here. Many other cables have a tendency to make the sound darker or lighter, but here your get all natural sound in the whole frequency range. Only the mighty Supra Sword ISL cable is better than this one in Supras line-up. But then the price is much higher, so with the EFF-I you get a lot for your money.

Flawless signal transfer of even the most subtle music details is always the goal. A traditional cable, e.g. included interconnects with the hardware or the supermarket "high-end", simply cannot reach the level of desired refinement an audiophile expect. There are electric properties that needs to be addressed prior to reaching the goal; capacitance, phase, skin-effect and shielding. The purity of conductors, dielectric choice, plating quality is generally sub-standard even though they might appear high-end.

The skin-effect is the physical event forcing higher frequency signals flow closer to the conductor surface. This means that low and high frequency impedance are not equal and therefor affects the signal level and phase. It has a profound dynamic and clearly audible influence because an audio signal is in principle nothing but an infinite number of frequencies at an infinite number of levels.

In order to minimize the skin-effect, the EFF-I is designed according to our Equalized Frequency Flow (EFF) technique. Around a plastic core, the strands are wound forming a conductor tube, in turn forcing all frequencies through the same cross section area well tuned for the entire audible range. The result is a maintained frequency respons as from the source without any level changes like treble roll-off or phase shift. Further the strands are silver plated to provide for ultra-high frequencies and are insulated using PE, providing the lowest capacitance. Finally there must not enter any RFI destroying all efforts to maintain original signal integrity and our aluminized PET foil is a high bandwidth efficient shield keeping noise outside.

EFF-I is one of Supra´s most awarded products, not without good reason…

EFF-ISL – Analogue interconnect.

The above Supra EFF-I equipped with our best fully shielded single-end connectors Supra PPSL. The connector features chuck locking strain relief to the chassis female RCA, hence securing seemless connection and a chuck lock cable strain relief providing long service life also in applications with frequent reconnections. Suitable for use in every single-end application from entry to mid-end level, where dynamics, timing and faithful music reproduction is desired.