I did; we were the opener and the tech for the headliner wasn’t sure who built them or how they wired them. I asked if he would open up the ends and he wasn’t too keen on the idea of messing with it.
Signal chain goes: ULXD to Kemper Stage (or Helix or Neural or whatever) via 100-ft loom; then from the kemper back to the mix rack via the same 100-foot loom. Apologies for the confusing title. I’m trying to avoid having the unbalanced instrument cable side of the loom pick-up noise along its run.
Again, really trying to avoid DI or boxes because they add clutter, and are easy to get lost when a dozen stage hands storm the deck and start pulling stuff during changeovers.
With Kemper Stage, I would use the XLR outs (balanced also) from the Kemper.
Getting the signal into Kemper Stage is another story. It could be done with unbalanced cable (not recommended for long run), but I would myself look more into Shure QLXD16 (discontinued) kind of a solution.
We had the QLXD16 with the other guitarist who used Helix until he went to Kemper Profiling amplifier and the QLXD16 was perfect for that job. It's a shame it is discontinued...
Reason for him to move from Helix to Kemper Profiling amplifier was the sound he was pursuing.
What we've done now is:
Both guitarists have QLXD wireless and QLXD receiver is in same rack and connected to Kempers (Profiling amplifier in our case) and then EtherCon CAT to Kemper pedals and audio from Kemper amp is taken out of the XLR outs, which are balanced, behind the Kempers.
Lead guitarist also has a cabinet for his own pleasure which is driven from Kemper's speaker output.
All the gear (Kempers, wireless...) are in the same rack where our IEMs etc. are in the monitor world.
EDIT: The only thing to keep in mind with this setup is the lenght of CAT cable that Kemper is working with. We have a signal booster for the SR, because the lenght of the CAT is exceeding the limit for robust operation with Kemper.
To make everything easier we've done panel for the back panel of rack with EtherCon, TrueCon and XLR's (and speaker output for lead).
Br,
-Minka-