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Multi-Way Conventional loudspeakers with crossovers

Exploring Purifi Woofer Speaker Builds
Exploring Purifi Woofer Speaker Builds
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Old Today, 12:07 AM   #441
xyvyx is offline xyvyx  United States
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mmm.. beefy. So I was fiddling with WinISD and it lead me down this path. "Why not go with an external port?" a friend suggested.
Click the image to open in full size.

Turns out, tuned to 35hz, you'd need a ~ 25" long port at 3" in diameter. Same height as I'd use for some stands. So I abandoned my idea for an internal, 3D printed port/flares and got some aluminum pipe. It didn't list the OD or thickness, but as it turns out, Schedule-40 aluminum pipe in this size is 1/4" thick. So yeah... beefy.

I'm gonna try to make the way I attach it to the bottom of the box sorta "modular" so that I could maybe try a slot-load something something in the future. We'll see.

So.. am I missing something? is a big, long port w/ this smallish driver dumb?
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Old Today, 01:39 AM   #442
xrk971 is online now xrk971  United States
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Exploring Purifi Woofer Speaker Builds
You should make your port smaller dia and shorter. The problem with a 25on port is that it is long enough to have pipe harmonics and 1/2 wave is 270Hz - right in your critical mid bass region, and the 1/4wave is 135Hz right at your upper bass where “slam” is felt. A more reasonable length is say 7in or 9in. Or just use a passive radiator. There’s a reason vents aren’t not 2 ft long (except on huge car audio subs where they low pass it at 80Hz).

Also, it makes no sense to spend so much money on thick wall 25in long aluminum pipe. That’s pricey stuff when a PVC pipe will work just as fine. It’s internally hidden right? It’s not providing structural support is it?
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