How close can I put drivers in an enclosure?

How close is too close for drivers? I know the closer they are together the better they will meld. These are pretty close though. For reference, this cabinet is 32" tall.

Yes yes, I know it would be better if the baffle was larger but there is the "wife acceptance factor" that must be considered and has severely limited my loudspeaker design dimensions.

Screenshot 2024-06-05 133206.png
 
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It probably makes sense to push the woofer down and pick a bigger distance. With some fiddling and the right choice of crossover frequency, you could mitigate the floor bounce a bit. Anyway, keeping the woofer and mid as close as possible doesn’t make much sense.
 
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Personally, I much prefer to keep the center lines aligned. If you don't want to push the woofer down too far, at least align the mid and tweeter. If you keep the mid/tweeter offset from the woofer, I'd suggest you mirror image the left and right speakers....
They will be mirrored. I want to reduce baffle edge frequencies as much as possible while also keeping the tweeters as far out as possible.
 
Driver distances depend on crossover frequencies.

Are you building subenclosure for midrange? They can not share the same volume with woofer, you know.

Vertical alignment is valid point.
I will be designing the crossovers after I take the frequency responses of each driver. I want the measurements from the drivers in the cabinet.

The woofer will have a 3d printed little half sphere enclosure behind it. This will be quite thick and double walled with minimal infill to create an air trap between both woofers enclosure space.

Vertical alignment double the edge diffraction of both the mid and the tweeter across the horizontal. It also pushes the drivers further apart.
 
Sharp box edge has far more dertimental effect on diffraction than your speaker placement.

No, it does not pushes the drivers further appart. Only the distance between the tweeter and mid matter. Therefore you can have exactly the same distance both ways.

It makes far more sense to have subenclosure printed for mid.
 
If they are very close then vertical alignment isn't going to be as critical. This is only talk at this stage.

Crossing based on responses isn't going to give insight into the issue. Crossing a mid too high can also leave a power hole, just as driver spacing can.
 
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If you are using the HiVi RT1.3 (which is what I think you were doing from the other thread) you should cross around 3khz. Then I'd recommend center to center from tweeter to midrange about 5.4 inches. To keep the measurements simple I'd just choose 5-3/8" or 5-1/2".

I'd then put the woofer wherever it needs to be to have about the same, or a little more, space between it and the midrange. It doesn't matter but will look more symmetric.

Vertically offsetting the drivers may improve the on-axis diffraction but sometimes makes things worse off-axis. The nice thing about VituixCAD is that you'll have the off-axis measurements and when you pay attention to the Listening Window and In Room Response you'll be able to take everything into account.

Somewhat subjective, if it were me I'd center everything or at least keep the tweeter and midrange aligned, but I have no objective data to support one way or the other.
 
Besides my agreement with the points being made above, if you would build your initial screenshot, you'd have trouble creating a subenclosure for your mid because there's just not much physical space to create a proper division inside.

And since you mentioned it, and this is just my opinion of course, but if WAF is important, I think at least aligning MID and TW would make the design prettier. Now it's like some kind of reverse gravity happened and pulled everything up 😀
 
I would be concerned about weakening the front baffle so I would either double it up or use braces to stiffen. I had a pair of L100's with a similar layout and I could feel the front baffle flex near the mid and tweeter. I added a simple front to back brace under the tweeter and it made a big difference.

I typically add braces between drivers on any DIY cabinets.

Rob 🙂
 

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Besides my agreement with the points being made above, if you would build your initial screenshot, you'd have trouble creating a subenclosure for your mid because there's just not much physical space to create a proper division inside.

And since you mentioned it, and this is just my opinion of course, but if WAF is important, I think at least aligning MID and TW would make the design prettier. Now it's like some kind of reverse gravity happened and pulled everything up 😀
I will be desining a 3d printed subenclosure that mounts to the inside of the cabinet. This will give the mid its own airspace and seperate it from the woofers airspace.
 
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