Re: Microphone splitter questions
You don't need to spend that kind of money to accomplish your goal. Something as simple as this could do the trick:
Avid Audio Splitter XLR Line Monitor 0180 03048 01 Rev A | eBay
Or, http://www.amazon.com/Hosa-YXM121-Female-Dual-Cable/dp/B000068O59
Now, these are NOT transformer isolated, but in most cases, that's all you really need unless there is a ground loop situation from your line6 mixer and the FOH mixer. Sourcing power for both from the same source usually is enough that it's not a problem.
Or, as another solution, you could talk to the sound guy and have him adjust the monitors more to your liking. Long term, that's a better solution for you.