You already have the crossover in the second receiver, you just need to use it. Route the 80Hz signal into the second receiver, set the crossover point to 50, then run the sub out (now at 50Hz) from the second receiver into the inputs for your amp channels. In that way, all your transducers only see the 50Hz and under signal.
Optionally, just send the full range signal to the second receiver, the result will be the same after the crossover is set to 50.
It's a VIRTUAL channel unless stated otherwise.
Last edited by RayGuy; 06-02-2020 at 12:26 AM.