An odd port question. (literally thinking outside the box.)

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Cableaddict

Member
Joined 2016
I know less about building speakers than Butterfly McQueen knew about birthin’ no babies, so this is probably one of those questions that I’ll regret later on, but -

Yesterday I learned from you fine folks how much trouble port turbulence can cause.
So I was thinking today, not seriously, but, well, you never know:

What would happen if you took a port, and pulled it out in front of the grill, instead of inside the enclosure?

Of course it would change the effective enclosure size, and the tuning would change, but assuming those could be compensated for, could it possibly tame some of the objectionable turbulence at high volume?
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“ ’Twas the night before XMax, and all through my abode,
not a sound wave was stirring, not even a node.
When all of a sudden there arose such a clatter,
that I sprang to my ports to see what was the matter! ”


Hey, it’s a work in progress …..
 
T

TMM

Member
Joined 2007
Not really any different to having the port mounted inside the box. Obviously the turbulence situation is swapped end to end if you go from having one end of the port mounted to the baffle and the other floating inside the box - to having one end mounted to the baffle and the other end floating outside the box. Still need flares on both ends if you want to reduce chuffing noises.
 
chris661

chris661

Member
Joined 2008
You see it done very occasionally when a particular driver/cabinet combo calls for a very long port to get the desired tuning. Usually they'll use 3-4" PVC pipes with all the angled bits and make a very long port outside of the cabinet. Sometimes it's easier than folding the port inside the enclosure (which would take up a lot of room), but I couldn't deal with the aesthetic, myself.

Chris
 
mart34

mart34

Member
Joined 2004
My only concern would be if you took the port out too far from the enclosure and it was unsupported, the unsupported length of vent pipe might rattle around itself. Bracing it externally would look odd, whereas normally inside the box it can be supported easilly
 
ICG

ICG

Disabled Account
Joined 2007
Cableaddict said:
What would happen if you took a port, and pulled it out in front of the grill, instead of inside the enclosure?
Click to expand...

Nothing except the volume of the port isn't deducted from the speaker volume anymore.

Cableaddict said:
Of course it would change the effective enclosure size, and the tuning would change, but assuming those could be compensated for, could it possibly tame some of the objectionable turbulence at high volume?
Click to expand...

If you increase the size (diameter/surface area) of the port, it becomes longer, sometimes extremely long. If that happens, you'll get length- or even crossresonances. It's a much better solution to use a passive radiator instead in such cases.
 
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