Big News about ported flat packs that I think you guys will like!
Gentlemen, I've been building prototypes for big ported subwoofers for a couple months and feel like I finally nailed down a design I'm very happy with. It's an extremely flexible design, super easy to build, and fits all the goals I was hoping for. The previous prototype went together pretty easy. But the port went along the bottom and up the back panel. That's okay for big designs that would use an external amp, but for smaller designs that could use a plate amp......there was no room on the back panel to install it because the port was in the way. Not good because I wanted all the ported boxes to have about the same type of 'look' and assembly. I've finally cracked the code!
I decided on a tall square enclosure with a narrow stance and porting out the side. Basically a wall hugging design. Very flexible because even the monster 18" model only comes out in the room 15"!! So you could put 2 of these in the corners and have them firing into the center of the room, but ports shooting at you. Or switch sides and keep the woofers firing in, but ports shooting away from you. Aim the woofers into the corners, flush against the front wall facing you, facing the wall, etc, etc.
This is a ported 18" that can be tuned under 20hz. It nets about 5.8cuft after bracing.Rear panel with rabbet joints for fail proof brace installation:First set of interlocking cross braces:Here's where the beefy "Stonehenge" bracing starts. There's a brace behind each of the woofer's screws:Side wall bracing goes in:Fold up the sides to touch the braces:Here comes the slot port:Jumping ahead to show the finished guts of the beast:Front panel drops right on:And Boom, it is completed:
Keep in mind this is just a prototype and I might end up moving some braces around on the finished models. On the smaller designs a plate amp could be installed on the back panel in a few places, but I'm guessing directly behind the woofer inside the 'stonehenge' would be easiest.
I'll post more details later.