Weird setup. Jeff!
Eclipse require XLR connections for +4 dB balanced and unbalanced signals. The 1/4" connections should be used when a guitar is directly connected to it.
The amp used thru FX loops should, in theory, provide a +4 dB unbalanced signal. Check its manual. The other amp is definitely used with a -20dB signal.
Since everything is connected to the Switchblade, the real question is how THAT unit handles signals. Check its manual and refer to its manufacturer.