I chose the Dayton Loudspeaker 8" Shielded DVC sub (#295- 480) because it met my two criteria perfectly: it would fit in a smallish box and has a very attractive price tag. It also seemed like a good idea because there is an available matching passive radiator (#295-492) at a nice low price. On this project, I used a Dayton Loudspeaker (#300-784) 70 watt plate amp-it has just the right amount of power for this particular driver in this application.