(Based on 
The next-generation Siren speaker cable with an open-core design.
The Siren II Speaker Cable features IGL and solid core primary conductors to give you open and extended midrange and high frequencies without glare or etching. Inside you'll find a bundle of 6 - 20 AWG conductors which avoid skin-effect anomalies yet are large enough together to provide ample damping. The open-core design of the Siren II speaker cable increases space between the conductors, while the polypropylene insulation holds them rigid to reduce magnetic interaction and electromagnetic modulation. The durable PVC jacket keeps the cord flexible enough while protecting the conductors.
Based on 
