No unless you intend on using RCA into your DX100? I use 3.5 to 3.5. I got my silver cable from zeroshoe on ebay. I also have a copper LOD from Fiio and one from Tralucent Audio (which came for free with my T1 Amp). You can probably contact Tralucent Audio if you were just interested in the LOD. I tend to like using that one over the Fiio.
but isnt 3.5 to 3.5 meaning double amping?