So the box isn't happening for the time being. I did however manage to get the soundstream hooked up today. The front stage keeps up with the bass quite well now. Only a few songs that don't, and those are the more mids-intensive dubstep songs I have.
Sorry I'm at a lack of pictures, it hasn't been very nice around here and I really don't want to pop the trunk hatch with ANY kind of moisture going on. Soon as the weather clears up, I'll have a few more pics in the first post.
On to the bright side, this thing is rude to be a single 15. It's done both of my past 18" subs to shame [HDC3 and the SA-x]. It moves a lot more air then either of them did either. I'm sealed [except for about 2" on my passenger side] and still feeling a good breeze. I don't believe my bass perception is off just because of the "not having bass for a while" thing either, as my vision is blurring at full tilt. I've had some skews here and there on my past builds, but nothing like this. At times it's hard to read my radio. As far as driving, I'm fine. But focusing on a road sign to read it is very difficult to see clearly.
On another note, being back to a "traditional" woofer has made me miss my X-18. I hear it hitting, and I hear distortion. Instantly think I'm clipping, check my knob and everything is good [and the knob is EXTREMELY accurate.] Just gotta get used to having a normal sub again.
I'm actually really surprised with this thing. It plays extremely flat from ~32-60. I have my filter on the deck tuned to 63hz @ 18DB slope, so anything after that drops. SSF is set at 30-ish. It'll play to 70 with no problem, but I don't feel it's very safe in that region, especially considering I'm probably over powering this thing.
I've been keeping an ear on it as I tune and test all the tracks I'm familiar with. I occasionally hear a bit of buzzing on certain tones, but there are a multitude of things that could be causing it. I'm presuming that my box is leaky. I know it's huffing a small amount of air out the back where I just drilled holes to run the speaker wire. I also used closet flanges to mount my PVC to, and didn't bother flaring the inside of them. So port chuffing is very possible at this point as well. I also have a ton of junk in the car right now from where I have just slapped everything together in the past week or so, and that could be causing some buzzing and rattles I would think.
I've checked the dust cap after every session I have of pounding on it for about ~3 minutes wide open, and to also check that the suspension isn't giving and that the coil isn't loosening. It's warm, but no where near hot. My X-18 got way hotter way faster, and stayed smelly. So I feel comfortable, for now. I had no idea what to expect out of this sub, so I'm being cautious but giving it hell at the same time.
Hoping to get my other box built soon, except I'll be using a single 6" aero instead of (2) 4". So we will see how it goes.