My center channel has always been the weakest link of my front stage. It’s a hand-me-down TM that, while not bad sounding, is inadequate compared to my MTMWWW mains.
However, after adding a pair
of sealed HS24-MKII’s, my mains are also lacking the output to keep up. I figured I would go with a matching L/C/R and retire my 4TSE to the bedroom.
I decided on The Aggressive 1299
. I’ll be building them to 6 cubic feet with dual slot ports tuned to 47hz.
The build will begin with the center channel. The L and R will follow.
I designed the cabinets in such a way that the center can switch from being horizontal to vertical with the swapping of the center section of the double baffle. This is experimental, but it looks sound on paper, er, in Solidworks. The vertical configuration of the center channel will be identical to the left and right if I ever use them behind an AT screen. This required spacing the woofers slightly wider than I would have otherwise, but not by much.
I’ve been all over the map with respect to box size and port tuning. I decided to go as large as I could using the following restraints:
No deeper than my subs at 21”
Not wider than 15” (75% wider than my current mains)
The height was negotiable, but I wanted to keep it under 47.5” for efficient use of material on the CNC. I can fit all three cabinets on 5 sheet of ply if I keep the height limited, with little scrap. Pushing the height doesn’t work out as well.
The center of the waveguide is 26.5” from the floor for the left and right. I’ll add some stands to bring that up to ear level.
The skillfully packed parts for the CC arrived yesterday. And blank xover boards came from
Both @Eric H
were helpful as I pondered cabinet size and tuning.
The ports are 2.75 tall x 13.58 wide and 8.705” long. In the sims the ports are 10.08 inches long, but I’ve reduced them by half the height since they run along a wall. That’s the method I’ve read repeatedly, but my ears are open if there is a better approach.
Some parts for the CC:
These boards looks great and should make the xover assembly a breeze.
SPL at 100 watts at 3 meters, compared to the 1299 in a sealed box of the same size, and my current mains. The left and right will have considerably more power on tap, with a Gen 1 XPA-2. The center will be powered by a Denon X3300W.
Port velocity with 300 watts no high pass.
Response compared to sealed in the same size cabinet.
This is the approach for the modular center section of the baffle. I couldn’t make it a square without further pushing the woofers down and limiting the port height, so it will require two sets of the center section.
In vertical configuration:
Here is how they’ll sit in my room:
And here’s how the tower will look without a side panel, colored braces, before a horizon at dusk (now you don’t have to ask).