The proper way to bi-amp the fronts would be to use an external crossover (no 'y' jack).

Run a cable from the FL output of the 950 to the input of a 2-way active crossover. Then run the LP output of the crossover to the LF amp and the HP output of the crossover to the HF amp. Do the same for the 950's FR output.

Otherwise, I'm misunderstanding the term 'bi-amp the front speakers'.