I've got a 2006ish Velodyne DD18 that was a floor model at a closing tweeter. I got it cheap and it's still going strong. I've heard the bigger ones last longer because the amps are stressed a lot less. I'll be disappointed if I can't get parts for it when it croaks, though. It's been a great sub. I use a Behringer ultracurve to EQ out the room nodes so I really don't need a sub with all of the signal processing available. When the time comes my next sub will probably be a cheaper, simpler one.
