Just go the replacement sub in and hooked up. This one works! I have not ran the calibration yet. I wanted to check, my AVR has the crossover separate for all the speakers. Right now i have the Sub, Front and Back speakers all at 80hz, is that where it should be? Also how many decibels should i have the sub set at on the AVR? I have the phase at 0 and the volume on the sub at half.