didnt understood what you mean, i will answer:
s1 gives a ton of interferance with stock cable, i reduced it with a shielded cable
w1 doesnt give me any interferance, though i use the same shielded cable as for s1.
everyone is talking about w2, in my experience, until i dont test it/ buy it, i cant say anything, the specs are amazing, the measurements are cool, though, i think w1 is more than enough for me, it already outmakes my current dongles
edit: oh ok, i got it. mmmmm if emi its the reason, nah, its not worth it, just change to a shielded cable and maybe some faraday tape (i have some on my s1 and a silicon cover for it not rub with my pockets while im on the go, though sound quality w1 has the upper hand over the s1