Background: I've done quite a bit of reading on here prior to this decision. I'm fairly familiar with WinISD, boxnotes, the various home theater shack calculators, the eq-ing process, etc.
This will be the first enclosure I've built but I'd consider myself to be fairly handy with build/design. I do own a table saw, router, jigsaw, miter saw, circular saw (with guide), sprayer, various sanders, etc.
The new subs, once finished, would be in lieu of my Captivators in my basement theater. I do love the Caps and they will not be leaving my house! The Captivators will be moved upstairs to my living room. The viewing area of the room is 13x22 and the total size of this room is 16 (average width) x 44. Concrete slab, drop ceiling, some DIY bass traps for now, yada yada. I'm not in a rush and I want to do this correctly.
Obviously if I'm going to make this effort I want to use some decent drivers. I'd like to start off with a prototype unit and then expand to fill the rest of the room. I've been looking hard at the Mach 5 Audio UXL-18 driver. It seems to be one of the best values out there for what I'm seeking to achieve. Good power handling, decent sensitivity, and good value overall.
How difficult have the UXL-18s been to procure these days? It seems in the past the wait times have been less than ideal. Have the QC issues been worked out, reliably? I've followed HuskerOmaha's thread and I know he had his share of challenges. I suppose I should chat with him directly.
Here are my thoughts on a design approach: I've been toying with some models in WinISD and it seems to work well in a ~3.5 foot enclosure. This seems to give me the best low end extension down to 10hz while keeping excursion in check. Using Boxnotes I've come up with a box of 20w x 20h x 22d that accounts for driver displacement and some bracing as well. These dimensions give me a net volume of 3.57 cubic feet. I'll likely build the first unit out of 3/4" MDF with a double baffle up front and driver recessed. I'll be stuffing the box with some type of filland using a speakon connector in the rear. Ultimately I'd build 4-6 of these and place them around the room to smooth things out. I've attached some screenshots of what I'm working with.
Bracing - I'd like to use (2) 18.5x18.5 panels with a 17" or so circle cut out spaced 1/3 front and back. Is this overkill for this sized box? Should I stick with one brace, centered?
Edges - Will likely do a roundover on all corners to keep things smooth.
Finish - TBD, but likely something like a Duratex finish. Seems nice and relatively easy to apply.
To keep things simpler and making less enclosures, I'm toying with the idea of first building a dual opposed enclosure. Will I simply double the internal volume for one of these bad boys? If I'm going to begin placing them in the acoustically proven best position of my room (mid wall under my projector screen), I will really only be height limited to about under 28". Width wise I have about 62" inches to work with and depth and I'm not really limited. I'm trying to keep all this in mind for when I build multiples. If I go the dual opposed route, I'm hoping to keep the enclosure right under 6.5 net working cu feet which puts me to something like 22w x 28h x 24d. I must admit it seems that placing smaller enclosures in the room does seem a lot sexier though.
My current equipment: Denon 4311 receiver, miniDSP for EQ, omnimic v2, CHT SHO-10 LCR. I currently own Crown XLS5000 and EP4000 amps. I'll be adding to this stack as needed.
Feel free to throw in some thoughts/advise as I begin my journey. If I'm clearly overlooking something in my process PLEASE don't hesitate to let me know. Thanks so much in advance for your input and consideration.
boxnotes for 20x20x22.JPG 64k .JPG file
uxl18 in 3.5 cu foot box.JPG 119k .JPG file
Edited by Gorilla83 - 10/26/12 at 6:39am