I don't think it will make a difference. However I would recommend, if you have the room to go to the PB1000 Pro which is ported. I think ported subs on the whole sound a lot better, as the tuning ports couple much better to the room, especially at lower volumes. The sealed enclosures have to have a lot of Eq to get low bass and so there is a lot more stress on the amp.
To make a really good sealed sub, takes a lot of power and an expensive driver. As far as I'm concerned the only reason to buy a sealed sub is you don't have room for something a bit bigger.