It looks to me that you've got limited options with this pairing, and neither are optimal:
1. If your satellites can't handle deep bass, run your signal source (CD/DVD player, etc.) into the RCA line level inputs of the sub, then run the sub's RCA outputs to the input of your amp. You'll have to control the overall volume with the source, however.
2. If your satellites can handle low bass, run from the loop outputs of your amp to the inputs of the sub. Since both the satellites and the sub might be trying to reproduce some of the same frequencies, they might not integrate as well.
A separate preamplifier would be handy here, since your Emotiva doesn't have a tape/processor loop.
Kept in mind the rather mild crossover of the Knight Shadow: fixed at 70Hz, and only 6dB per octave. You might end up sending too much deep bass to those satellites and they could be damaged if they weren't meant to take it.
Hope that helps!