The Analysis Plus REL Subwoofer Cable uses the Analysis Plus patented hollow oval design to give you tight clean bass. REL Subwoofer Cable uses Swiss-made Neutrik SpeakOn connectors at the input to the REL sub-bass system. With over 100,000 RELs in use the world over, this connector has proven itself reliable, neutral and a mechanically ideal connector. Analysis Plus also features high-quality spade lugs coated in gold to minimize oxidation.