Sort of, yes. But I've seen guys build subs with external pipes, too.Is a slotted port (like the Onken) actually an exterior port? Yes? No?
Jim Taylor
I've seen a few ports swept back to get that retro sports car look, too or maybe a top-fuelerAbsolutely.
The Plumber's Delight (InDIYana Nanotech winners) - Techtalk Speaker Building, Audio, Video Discussion Forum
I put together a PDF summary for my Nanotech design. I got a error message trying to upload it, so here are the individual pages in highly compressed jpegtechtalk.parts-express.com
For niche applications with a low port tune, an internal port could double the internal volume.
I have used external ports on a handful of subwoofers, that way I could readily change the tuning frequency without dismounting the driver to reach inside.
Absolutely.
The Plumber's Delight (InDIYana Nanotech winners) - Techtalk Speaker Building, Audio, Video Discussion Forum
I put together a PDF summary for my Nanotech design. I got a error message trying to upload it, so here are the individual pages in highly compressed jpegtechtalk.parts-express.com
For niche applications with a low port tune, an internal port could double the internal volume.
I have used external ports on a handful of subwoofers, that way I could readily change the tuning frequency without dismounting the driver to reach inside.
Is the 'trap' (essentially) a Helmholtz resonator set around 1/4 & 1/2 frequency (wavelength) of those two peaks?
Partially. It is filled with low density absorption, which reduces the peak effectiveness of the resonator trap, but broadens the absorption curve.
It's the mass of air in the port resonating with the "springiness" of the cabinet air volume.Thanks! I was actually wondering what affect the filler would have.
Edit: There's some fundamental piece I'm missing. Most of the 'ideal' and calculations are based off of a 'tube' or 'opening' of some shape and volume, connected to a larger body like a cylinder or sphere. But what happens when it's just a single tube, like in this case? How should that resonance frequency be calculated? All of the equations are for this former kind of 2 body shape. My previous assumption was just based off of soundwave length VS tube length, but maybe (probably?) that's incorrect here.
Sonotube FTW. Works more as a transmission line, though, not a port.