Bought a used Dayton Audio Sub 1000 and tried it as an experiment with my outdoor speakers... sounded pretty darn bad. Figured it was either the crossover in the Dayton or the new cheap in-wall speaker wires I was using. Moved the old but high end for the time, Velodyne sub from my son's living room outdoors and gave it a try... truly much, much better. ... replaced the speaker wires with better and we were in business! Sounded very good actually. Sadly, I can't bring myself to use the Velodyne outdoors for the season. Will keep my eyes open for a better "inexpensive" sub with high level inputs and outputs. I'm sure that the Dayton will sound fair using the line level inputs ... $50 and it's yours lol