Just put a "Y" cable on the sub out and send the signal to the left and right amp inputs then connect the subs. You will be using the crossover in the receiver.
Bi-amping with no pre-outs
I would like to add an amp to push the woofers in my NHT 2.4�s, but my receiver has no pre-amp outs. What it does have however is a single sub out, which I use for its intended purpose and would like to know if it is possible to split the signal for bi-amping purposes? Possibly to an Adcom GFA...