DUM stands for Distinctly-un-magical cables. DUM uses no magic copper crystals or pixie dust insulators, and is hand-made in the USA. DUM is a 24-guage (per conductor) OFHC cable designed in collaboration with a guy who's forgotten more about cables than we will likely ever know; we told him what we needed, he went through a LOT of iterations with us to dial the sound in, and we got DUM. And it was good to be DUM. To our ears what sets DUM cables apart from our stock cable is a fuller, cleaner and more detailed sound with a deeper soundstage and a very organic upper register. As of November 2015, we have improved the cable's flexibility so it now has a nice relaxed drape and microphonics are greatly reduced. If you're not sure (or negative) about whether a cable can actually make a difference, check some DUM cables out at a meet and compare to stock, it's pretty easy to hear the difference.