I have never done DIY full range single driver before, but I've been recently interested in such thing. Then I started browsing the web, and was interested in Fostex FE206En. Anyway, there seem to be two popular enclosure designs of the said Fostex model: double bass-reflex enclosure, and back-loaded horn enclosure. The double bass-reflex enclosure seems to be much simpler to build. And based on the Youtube video I've watched, the double bass-reflex enclosure indeed has more bass. So it raises a question: what are the advantages of the back-loaded horn enclosure, then? If double bass-reflex is easier to build and has more bass, then why bother with back-loaded horn? And yet, back-loaded horn seems to be the most popular enclosure design for full range single-driver. I have listened to both models, but only from Youtube videos, so it is not the same as listening directly --not to mention my amp and speakers color the sound of those videos. Could anyone more experienced with single-driver enlighten me more about the difference between those two designs?