Actually, that thread is what sparked my question. If you noticed, I have posted in said thread. So, that answers the questions about my receive's and subwoofer's amplifiers, but not about its LFE circuitry. For example my Marantz CC-65SE CD player has a frequency response of 2 - 20,000 hz. I would like to assume that my LFE circuitry is capable of sending those 2hz signals out to the sub.