I face them firing rear with a Portside and they don't sound as good as firing front I'm going to try firing up next but I did before and I remember it not sounding very good but my box isn't perfectly Square either it's got a slanted face. So maybe if I turn it upside down period I'm just thinking out loud sorry. But the point of me wanting to know all this stuff about the box is I can't see myself spending $200 on a custom made box when I'm skillful enough to just build one myself. My best friends are Framers so I can get some help from him if I needed and I know my way around a tape measure myself being a plumber. I was thinking about getting some PVC or ABS pipe to use as a port period or is that a bad idea?