Sommer cable sc onyx 2025 mkii sc onyx 2008 patch cable sommer cable 300 0031 the sommer cable 300 0031 is a single sc onyx tynee patch cable that is similar in construction and quality to the tricone mkii but a little thinner due to the twin construction it is suitable for the fabrication of hi fi cables adaptors and for permanent installation and it fits almost all jack and rca plugsapplication cabling for unbalanced units keyboards connection of hi fi units construction of y ad