More Sub photos too please!
When you first hook up the Sub use a low level (RCA) cable, turn the crossover frequency to max (clockwise), with the Phase fully counter clockwise, and volume to approximately 1/2.
Then you can plug it in and run the receiver setup with the YPAO mic once you have the rest of it connected (speakers, antennae, laptop, etc.) Early on be very careful with the volume.