The SI series instrument cables are designed to offer exceptional audio performance, while providing the user with an extremely durable cable. Heavy duty G & H brand ¼” phone plugs are hand soldered to guarantee a perfect connection. The SI series incorporates our Q-2000 series single conductor audio cable. The Q-2000 series wire is designed specifically for use as an instrument cable. The Q-2000 series wire is designed specifically for use as an instrument cable; therefore, great attention was given to assure this cable would be as immune to mechanical handling noise as practically possible. To provide you with the ultimate in audio fidelity, the Q-2000 series cable utilizes finely stranded bare copper wire for the center conductor and overall shield. By utilizing this finely stranded conductor material, both the high frequency audio performance and overall physical flexibility of the cable is improved. A specially formulated center conductor insulation material is incorporated to reduce nominal capacitance, improving audio fidelity. To assure that your audio signal will remain intact, the Q-2000 cable incorporates a served shield with 75% overall coverage to provide the necessary protection against outside interference while maintaining excellent flexibility.