QED QX 16/4 is a professional speaker cable, with a section of 1.5 mm2, made of copper. QX 16/4 contains four soldered conductors and is ideal for professional installations. The cable is flexible, numbered meter by meter. The outer jacket is made of fire-resistant PVC according to IEC60332-1. The good quality of the copper used ensures good performance even in the case of long routes. QX 16/4 is not an LSZH (low smoke zero halogen) cable. If this is imperative, there is the QX 16/4 LSZH version (pink shirt).