The F1800 is exclusively designed to keep the skin-effect out of the audio range, skin-effect is the main cause distortion in speaker cables, the F2800 utilizes 12 isolated stranded wires of solid OCC (Ohno Continuing Casting), individual high density PE insulation with a geometric permutation, eliminating harshness and increasing audio clarity, compared to all other normal configurations. The exceptional speaker cable can be created for multi-drive speakers.