I was thinking about this. So, sennheiser headphones use a 4 conductor cable, so crosstalk across the cable should be negligible. And beyerdynamic, they use a 3 conductor cable, but offer headphones in 600 ohm versions, so crosstalk across the cable should be negligible. But then what about...

I have a 100 ohm, 2vrms source. The headphones I use are the audio technica ad700 and shure se215. I was thinking about getting a fiio e11k. is that good? what are some other things I should look at? I wanna keep it under $100 if possible.