I have a Velodyne ULD-18II subwoofer for sale. It is in mint condition and includes the 600 wpc amp/crossover. This is a BIG sub, being that it has an 18" driver and is quite musical. Pair it with a good set of speakers and it virtually disappears, in a good way. This sub was made before Velodyne sent their manufacturing overseas and is a pure American product. They aren't built like this one anymore. I don't think shipping is practical, particularly since I don't have the box. So, anyone interested probably needs to be at least remotely in my area, which is Northern Colorado. I am willing to discuss any proposals about the cost of bringing it to you (within reason) or whatever works.