Custom Bundle - Canare L-4E6S, Vertical Bi-Amping Splitter Cables with Amphenol Silver XLR Connectors - Custom Made by WORLDS BEST CABLES All our custom made cables are professionally soldered with a Proprietary 4% Silver solder blend; especially developed by WORLDS BEST CABLES, we also use a specially developed, Proprietary Nitrogen-Assisted soldering process that is unique to us, which exceeds the highest industry standards, the overall integrity of the solder joints are greatly improved in comparison to traditional soldering processes.