I have been throwing around the idea of a DIY sub. I chose a fairly midrange sub and amp combo and a really nice guy at parts express helped me design the box. All nearly 10 cu ft of it! :gulp: Is this because of my particular speaker choice. If it helps any, it is a Dayton RSS390HF-4. I would like to do ported because of its advantages but when reality sets in, that is just plain too big. I have a ported klipsh 12 that is tiny in comparison. So if I chose a better speaker, can I go considerably smaller with the same performance?