In the vast majority of other solderless systems out there, you are essentially screwing the pin within the plug into a fray of conductor wires within the cable. As you can imagine, this connection is not exactly the most secure. Any movement over time can cause the pin to have reduced contact with the wires and eventually lead to cable failure. As a musician myself, patch cable failure is one of the most frustrating things you can experience. Especially before rehearsals, recordings or even gigs.
What makes the SIS so different from other solderless systems?
The first key difference within the SIS is that the cable is comprised of a solid copper core. The other is that instead of a pin, the plugs have a screw hole. In the SIS, the solid copper core is screwed in directly into the plug, creating an absolute connection between the cable and the head.
You can even see the screw grooves on the solid copper core that is unscrewed from an assembled cable.
This screw-in connection makes the cable and plug connection to be ultra-strong. Probably the strongest even amongst soldered cables. How strong exactly? Here is a bicycle suspended on just one SIS cable. This gives you the ultimate assurance that your cable is well connected and if assembled correctly, guaranteed against failure to even the rigors of being on the road.
Finally, the benefit of having a solid copper core makes your cables sound better. What? How can that be? Think about it for a minute. In normal cables, your signal is being transmitted through a fray of very thin wires. The physical contact between the wires inside the cable are not perfect and hence it presents a significant barrier that your signal needs to cross when moving between strands. This is known as strand interaction. Hence, your signal does not have a direct connection per se within your cables. With a solid copper core, we can eliminate strand interaction and create a direct contact between your plugs with little to no barriers between them. You can expect your SIS plugs to sound brighter and more robust.