I assume that you have given up. However, the solution is/was fairly simple IFF.. If your pre has both bal/XLR and RCA outputs and is designed to use both simultaneiouly, then...
--- Connect the XLR outs to the mid/tweeter amps. Verify that the psssive xover is stock. The passive will block all freqs below 100Hz hiting the L-EMIMs. Connect the RCAs to the External controller, woofer amps, then the woofers.. Simple.
--- Connect the XLR outs to the mid/tweeter amps. Verify that the psssive xover is stock. The passive will block all freqs below 100Hz hiting the L-EMIMs. Connect the RCAs to the External controller, woofer amps, then the woofers.. Simple.