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View Full Version : Tube vs. Slot porting??



RCobra07
12-18-2009, 12:26 AM
Which is better? Or is there any real difference? Also, does the ingress/egress of the port matter significantly...meaning, is it beneficial to use a router to round the corners of a slot port and/or buying an Aeroport-type tube over a pvc or other blunt end tube?

fasfocus00
12-18-2009, 12:30 AM
search button tells all

ciaonzo
12-18-2009, 12:31 AM
search button tells all

x2

And when that doesn't work, there's always Google.

RCobra07
12-18-2009, 12:33 AM
x2

And when that doesn't work, there's always Google.



Duly noted...and for anyone else who cares, here is a link to what appears to be a good thread on this topic:

http://www.caraudio.com/forum/showthread.php?t=449191&highlight=tube+slot

fasfocus00
12-18-2009, 12:39 AM
Duly noted...and for anyone else who cares, here is a link to what appears to be a good thread on this topic:

http://www.caraudio.com/forum/showthread.php?t=449191&highlight=tube+slot

omg, someone actually used the search button... why didn't you just use it before making this retarded thread?

RCobra07
12-18-2009, 12:46 AM
omg, someone actually used the search button... why didn't you just use it before making this retarded thread?

Quite honestly b/c it has screwed up most of the times I have tried to use it lately. Try typing "Re Audio" into the search bar and see what you get.

mrezstreet
12-18-2009, 12:54 AM
Man....you so many putz got to post stuff like that...
I am a huge slot port guy, but areo port compress air better and you can go smaller diameter. But some times they get to long to use in some boxes, if you have same size (50sq") slot vs areo....areo wins, but slots can bend around box making it ez to use....

Buck
12-18-2009, 12:58 AM
I think the search button is overrated. It is a lot quicker and more fulfilling to ask a specific question than to search through hundreds of pointless threads.

Cabin_Pressure
12-18-2009, 12:59 AM
Man....you so many putz got to post stuff like that...
I am a huge slot port guy, but areo port compress air better and you can go smaller diameter. But some times they get to long to use in some boxes, if you have same size (50sq") slot vs areo....areo wins, but slots can bend around box making it ez to use....

engrish?

ciaonzo
12-18-2009, 01:05 AM
I think the search button is overrated. It is a lot quicker and more fulfilling to ask a specific question than to search through hundreds of pointless threads.

lol

Where do you think all the pointless threads came from?

I know what you're saying, though. It's just that this question gets asked about as often as a person logs in.

RCobra07
12-18-2009, 01:10 AM
Man....you so many putz got to post stuff like that...
I am a huge slot port guy, but areo port compress air better and you can go smaller diameter. But some times they get to long to use in some boxes, if you have same size (50sq") slot vs areo....areo wins, but slots can bend around box making it ez to use....



Not sure what you're first sentence means:confused:

Anyway, looks like I have a heck of a lot to learn:emb:

PV Audio
12-18-2009, 02:26 AM
Man....you so many putz got to post stuff like that...
I am a huge slot port guy, but areo port compress air better and you can go smaller diameter. But some times they get to long to use in some boxes, if you have same size (50sq") slot vs areo....areo wins, but slots can bend around box making it ez to use....
Wonderful grammar and syntax. Pulitzer worthy stuff here.


Not sure what you're first sentence means:confused:

Anyway, looks like I have a heck of a lot to learn:emb:
You shouldn't know what it means because it's not entirely accurate. A port is supposed to do the exact opposite of compress air, it should let it flow freely to the outside.

WARNING: BORING SCIENCE AHEAD!!

It should allow the back wave to travel freely to the outside environment to add to the front wave. A ported enclosure is what is known as a Helmholtz resonator. What a HR is is a cavity of air with a neck or channel at one end. When the pressure inside the cavity is increased, the air wants to go to the area of lower pressure, aka, the outside, so that it is in equilibrium. Now, think about your speaker cone as a spring: as it moves in, it compresses the air in the box which increases the air pressure inside the box compared to the outside.

Unfortunately, when the compressed air inside the cavity encounters the internal mouth of the port, the air will have momentum to it and the cavity will consequently overcompensate for this and push out too much air. Why does it have momentum? The air in the cavity is of a much greater volume than the air in the port and by fluid dynamics, to account for the difference in pressure, the air in the narrower channel must move faster than the air in the box is actually being pressurized. That's also why smaller ports have higher port velocity: the air in the port has higher momentum which as you may know is a function of velocity, or as we are concerned, acceleration since the force that the cone is exerting on the air is changing due to excursion and different frequencies.

Now that the pressure in the box is too low, the speaker needs to **** in more air to be at equilibrium again. The process can repeat in reverse again and again until you get to equilibrium. That's why when you put a plastic bag in the port of your sub box to show off, it doesn't get ****** into the port, rather, it just flaps around. Air is being forced out and forced in succession.

This is the same reason why you cannot use too large of a port for a given volume because the speaker will not pressurize the chamber and will instead just shoot the air out the port acting like a horribly designed transmission line.

This is also why different speakers need different sized enclosures or not to be ported at all: if they cannot return that box to equilibrium (speakers with a high Qts value) quickly, the bass will be sloppy and the speaker can get out of control. A speaker that can create more pressure in the box is likely going to need a larger enclosure (larger diameter cone, or higher excursion) versus one that is smaller or moves less.

How does this pertain to slot and aero ports? An aero port allows the air to flow out of the enclosure more freely than does the slot port due to causing less turbulence, thus allowing for freer air flow for a given port area. That lets you get away with a smaller diameter port as he said, but the air is not being compressed better, rather, it's flowing more efficiently which is exactly the opposite. Unflared ports have little to no advantage.

Hopefully that helped you understand a bit about how ported boxes work and why you can't just throw any sub into a ported box and expect it to be loud. :)

-Dave

PV Audio
12-18-2009, 10:13 AM
How are there four aero vs. slot threads on the main page alone?

spltuscon
12-18-2009, 08:26 PM
Quick answer for you:
If using a "tube" then yes an aero is better in every way possible.
If using a slot port than rounding the edges is beneficial for sure.

Aero vs. slot- there is no winner, it just depends on the application

PV Audio
12-18-2009, 10:34 PM
Quick answer for you:
If using a "tube" then yes an aero is better in every way possible.
If using a slot port than rounding the edges is beneficial for sure.

Aero vs. slot- there is no winner, it just depends on the application

A round port vs. a slot port won't yield much difference. It's only when the ends are flared that it makes a difference, and a difference that is.