Where do you have them HPed @?sephiroth619 said:7's can go in a small enclosure. 0.3 cu ft sealed is recommended, you can go as low as 0.15.
8's require a much bigger enclosure, 0.8 cu ft.
As far as sound goes, I'm not sure about the 7" because I only own the 8". The Dayton Ref 8"s gets looooooooow, and sound oh so good at it. I have mines in a .8 cu ft enclosure and absolutely love them.