I could be wrong, but from my perspective, LINE LEVEL sends are used to drive LINE LEVEL inputs on HEADPHONE distribution amps in the studio. If you are driving headphones at the output level of headphone amps, hmmm, I really couldn't tell you if there would be crosstalk. Personally, I use a seperate balanced line which is actually a stereo headphone level to drive a passive splitter which can be daisy chained. I bought ONE of the units, and copied

the circuit and built 3 more. Hahaha. Cost me $5 in parts. The units were $65 ea. Fuck that. Actually, I modified the design to insert switchs for monitoring different sources, and two of these units are under the armrest in my console for recording or for monitoring/listening/mixing on headphones when multitracking in my control room.
fitZ