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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.