I just ordered my ava 15" today and now I need to decide on a box model. I want to use a large ported box design but I have never built one and wanted someone to look over my numbers. The sub will be used 100% for HT and I will most likely be using the pe500 amp unless some one has a better suggestion (I don't care if its rack or plate) and if enough people think it will make a significant improvement I will get a BFD as well. The two I've come up with are 8^3 ft tuned to 20Hz 10^3 ft tuned to 16Hz Do these seem about right? Does anyone have any other suggestions for size and tuning? My room size is 13x20x9 ft with a closeable door.