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Would a speaker port extending out of a speaker rather than into it work?
- Thread starter Razorhelm
- Start date
Yes this would work.
Calculate the enclosure's internal volume and the port's length and diameter using whatever program you prefer, and do not add the volume taken up by the port to the required enclosure internal volume because it will be external.
Calculate the enclosure's internal volume and the port's length and diameter using whatever program you prefer, and do not add the volume taken up by the port to the required enclosure internal volume because it will be external.
It should work fine and, as long as you correctly observe the internal box volume, be calculated the same way.
Done all the time in DIY, since even the longest port is cheaper than a passive radiator.
Normally people do it backwards, the forget to deduct the port volume from the box volume, so that side of the equation is off.
If I were making a 3d printed speaker I'd look at PRs, there are some really little one now.
If I were making a 3d printed speaker I'd look at PRs, there are some really little one now.
Yes, it would work, but just because you can does not mean you should...
Would need to know more. Notably, should look at air velocity for the port and potential pipe resonances. These are 2 major sources for undesirable noises from ports.
Would need to know more. Notably, should look at air velocity for the port and potential pipe resonances. These are 2 major sources for undesirable noises from ports.
mhardy6647
Grand Contributor
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Of course it will work.
In terms of Port Noise (and I'll stifle my Philip Roth pun for a change), there are myriad tricks to deal with that -- up to and including the nuclear solution.
The passive radiator.
In terms of Port Noise (and I'll stifle my Philip Roth pun for a change), there are myriad tricks to deal with that -- up to and including the nuclear solution.
The passive radiator.
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
Absolutely.
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.
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 jpeg
techtalk.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.
I've seen a few ports swept back to get that retro sports car look, too
or maybe a top-fueler Trouble Maker
Addicted to Fun and Learning
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.
Trouble Maker
Addicted to Fun and Learning
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.
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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.
Clicky clicky: https://en.wikipedia.org/wiki/Bass_reflex
Sonotube FTW. Works more as a transmission line, though, not a port.
