Thanks George, and sorry for the delayed response, but I may have confused things with the title of my question. I have the Large subwoofer, with only one active (12") driver. The 15" is passive. I've got two sets of input posts and two sets of output posts, totaling 8 posts. If I remember correctly, a two-channel stereo amplifier is to be connected to the subwoofer as follows: Left to one set of inputs and Right to the other, with the corresponding outputs going to the Left and Right speakers, respectively. My dilemma arises from my use of a 3-channel amp, only one channel of which is going to the subwoofer. I don't know (1) if I will damage anything by bridging the two sets of input posts, and (2) if it makes a difference which of the two input sets I use if I don't bridge.