Velodyne Impact 12
This is a subwoofer that I would classify as a mid level subwoofer choice.
The rear panel has a signal-sensing automatic on-off function with an LED power mode indicator, volume and crossover-frequency controls, and a phase-control switch. This sub as many on the market also has the LFE input that can be used as either a stereo sub in with left and right RCA cables or as a mono sub in by connecting the left channel input to a mono sub out on an audio-video receiver. They also have two speaker-level stereo inputs and outputs with wire connectors.
Full specifications here
Now in my opinion, this sub is an excellent buy at $329 which was the lowest price I found it for. I have always been a fan of Velodyne subwoofers and when it comes to parts and craftsmanship i could guarantee this is a company you can trust. The Impact 12 is covered by a five-year warranty on the drivers and a three-year warranty on the electronics. This is better than many warranties. This is a product I will recommend.