[Trevor]

On 9/02/2018 12:17 AM, Mike Rivers wrote:
You absolutely don't need a direct box (two for stereo) to connect a
headphone output to a line level input unless you're running a
particularly long cable, like more than about 50 feet.

Interesting figure you've chosen. Personally I'd never run that far
without going balanced. But then I'd always go balanced in any live PA
setup anyway. Frankly I can't even imagine bothering to make a 50 foot
unbalanced cable myself, even if it worked. Perhaps I could use XLR to
phone plug adapters if I was really desperate I guess.

Trevor.