Well, I have decided to start a DIY Shiva. I had a JBL PSWD112 but the amp broke. What is the sound/preformance difference between a sealed and ported Shiva. The reason I as it because, I am taking this in steps. I ordered a PE 250 watt plate amp and a Shiva driver. But for now I do not have the resources/time to build a box right now as I am at college. So I am thinking of using the JBL box which measures: 17.5" x 17.5" x 19.1" The PE am will not fit in the cutout of the JBL amp (the jbl is tall and narrow and the PE is more square). So I'll have to make a new back pannel for the amp. I am thinking of just making it sealed becasue the box measurements are very close to the sealed 54L box from Adire's website. (the JBL box is actually a bit larger) Do you think that will sound fine until I can build a new box sometime over spring break (in a month)? Thanks for any help.