Shunyata Research Delta Speaker Cables
Shunyata Research uses only the highest purity of copper available for the production of its wire products. OFE Alloy 101 or C10100 is the highest grade of copper with a minimum 99.99% purity and a conductivity rating of 101% IACS. OFE stands for oxygen-free electrolytic and supersedes the term OFHC (oxygen-free high conductivity). C10100 is the only grade of copper that comes with a written certification of purity. Certified by ASTM F68 C10100.
Crimping, soldering, brazing and cold soldering are all inferior methods of joining two wires or terminals together. Sonic welding uses high energy sonic waves to literally join two metals together at a molecular level. There is no solder or intermediary metals involved in the process.