Not sure if this is any help or makes any sense but I lifted the following from
here
What are the different ways of hooking up a subwoofer?
The first method works with all amplifiers and receivers whether they are set up for home theater reproduction or not. Connect the positive speaker terminal of the receiver/amp to the corresponding (right channel, left channel, etc.) positive speaker input terminal on the subwoofer. Then connect the negative speaker lead from the amp/receiver in the same manner. Repeat for the next speaker. Connect the speaker leads from the receiver (main L&R) to the subwoofer speaker level inputs. Then run wire from the sub speaker level outputs to your main L&R speakers. This method allows the subwoofer to produce the low frequencies, sending the upper bass, midrange and high frequencies to each connected speaker. Most subwoofers have controls so that the user can determine the range of low frequencies they want the sub to produce.