Hello,
Part 1 of, Meet the Focktaves!
My entry in InDIYana 2026 “FourMidAble Intersections” theme/challenge, where in my case, one driver, the mid, has to cover 4 octaves. I’m shooting for 200-3200hz with the mid, but measurements will tell the real tale when I get that far.
I was going to reuse last years “Tweeterectomy” entry by just adding a tweeter to the top of the box and redoing the crossover, but after playing around with that for a bit, I decided a whole new speaker was a better idea, and more fun.
In the past I have done many translam baffles, and boxes with shop made veneer, but this time I am opting for a plain’ish dyed Baltic Birch box with dye colour yet to be decided.
Overall dimensions are 20" tall, 11" wide, 15" deep, baffle is 2-13/16" thick (4 x 18mm BB ply) to allow for the bevel I want on the edge of the baffle.
As per usual, even for something like this, I use CutList Plus Fx to do my plywood cutlist, so I am making the best use of the material optimising the use of the sheetgoods.
Many times in the past, I have used a locked rebate to attach the top/bottom to the sides to make glue up easier, but I didn’t want the joist visable on the back if it came out sloppy so I used the Domino to join them instead.
Pics are kinda boring, just a guy cutting up some plywood, doing some joinery and showing a box that still needs a lot of work.
The back you see in the pic is not the back. It will be a “window” style frame (no windows yet) that the interior braces will attach to at the rear of the box and a place to screw the actual (presently not seen) back onto. It will make more sense in later installments. Since I don’t have an 18mm router bit, plus I wanted the groove that held in the back frame to be a stopped cut, I made a jig to route the groove in the sides/top/bottom to capture the rear window frame using a 1/2" downcut hinge mortising bit. I had not made this type of jig before, it worked well.
Drivers are Wavecor TW022WA06 22mm tweeter (been sitting on these for about 6 years from a Solen sale), Peerless NE123W-08 4" full range (last years PE prize money) and Bold North Audio BWX-6502 6.5" 8 Ohm Subwoofer (good deal from Q-Components here in Canada).
Doesn’t look like much so far, but this was a good two days work to get to this point.**
**Thanks for looking,
David.
#meetthefocktaves**