I’ve been lurking for some time now and I think I’ve gathered enough info to start my first post!
I'm currently working with a room that's approximately 14x14x8, but I'm overdesigning a bit to account for an eventual move to a larger house (and larger theater space). Here's a rough sketch of the current layout. The door next to the right speaker is an exterior door, and there's a 47inx8ft opening next to the left speaker that leads to the rest of the house. Equipment will go in the small closet toward the rear of the room, which I'm still working out details for cooling.
So I want to build a custom DIYSG 1299 LCR setup using a ported design but built around the sealed baffle. I believe it will make things easier for me to integrate a removable grille.
First of all, here’s a sketch of my intended design. I'm hoping I'm not shooting myself in the foot here with the height disparity between the center and L/R, and the screen being that high... I estimated listening height at 36 inches.
The first thing I did was to hit the Eminence site to determine their enclosure recommendations.
Large Vented Cabinet
At this point I'm thinking I'll need to target 4.722 (2.361x2) cubic feet net, after figuring for all driver/bracing/port displacements. (Assuming of course I intend to build to their suggested design)
Now I'm off to rip out some numbers in Excel. For the moment, I'm just using port dimenions as given by Eminence for a 65Hz tuning frequency. I took a SWAG at displacement for the SEOS, and figured 1/2 of a solid board for each brace.
I decided to punch these numbers into WinISD, and play around a bit with port tuning. And this is the point where I could use some feedback from the community.
I get significantly different port lengths depending on whose calculator I use. At the end of the day I'd like to use flared ports, but I can't even get numbers to match up using all straight round ports.
Another question for those with more experience with these drivers: Should I consider lowering the tuning frequency? I'm not sure what the stock tuning is when ordering the pre-fab kit. I'll be designing subs to go along with this setup, but I'm unsure what that will be just yet. I keep thinking I want to try a 4x18" IB setup (2 manifolds, 2 drivers each), but I may just stick with more traditional enclosures.
So can someone check my math and numbers here, and let me know if I'm even close to barking up the right tree?