Yup. And if you want, you can buy one of those plate amps that regular powered subs have, for around $80 for the cheapest one (120W, I think) at www.partsexpress.com - that gives you a powered sub with pretty much all the regular powered sub features - phase control, auto on/off, L+R summing into mono, and so on.
Some of these plate amps come with a built-in bass boost, so you might have to do some soldering if you want to disable that. If you don't care, there's no DIY involved other than connecting wires. There was a long thread on the DIY forum a while back on the bass boost on these amps, if you're interested.