Do I need space for my port to radiate - Realm of Excursion



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Old 04-11-2014   #1 (permalink)
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Default Do I need space for my port to radiate

I read somewhere that a port needs like six inches of space between it and the wall it's facing in order to... radiate? Is that true? I can see how putting a port right into a wall could cause the sound to be off but could someone go into depth?
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Old 04-11-2014   #2 (permalink)
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Default Re: Do I need space for my port to radiate

If you put a port right up against a wall, you'll choke it. I always follow the rule of thumb to keep it at least a port width away from a wall.
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Old 04-11-2014   #3 (permalink)
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Default Re: Do I need space for my port to radiate

Quote:
Originally Posted by arcwcb View Post
If you put a port right up against a wall, you'll choke it. I always follow the rule of thumb to keep it at least a port width away from a wall.
would having it TOO far away do anything bad?
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Old 04-11-2014   #4 (permalink)
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Default Re: Do I need space for my port to radiate

Look at a wall, it ports in to the cab, not a panel. Where the port fires and how far away is ideal all depends on your setup and car.
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Old 04-11-2014   #5 (permalink)
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Default Re: Do I need space for my port to radiate

Quote:
Originally Posted by Based View Post
would having it TOO far away do anything bad?
It might and it might not. If the port gains by loading off the surface, then it would lose by moving it further away. An example is SUV's where usually the box is subs up port back. There's generally a sweet spot where you get the most out of it, but it can vary from 3" away from the rear door to 12-18" depending on the vehicle, port size/width and tuning frequency/vehicle resonance. Guys with the same vehicle can have different distances based on what they're using, it all comes down to testing.
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Old 04-11-2014   #6 (permalink)
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Default Re: Do I need space for my port to radiate

^exactly
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Old 04-11-2014   #7 (permalink)
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Default Re: Do I need space for my port to radiate

with aero or kerfed ports you can go as little as 2'' from the wall, anything thats square edges or simply rounded over slightly i would plan to need at least 6'', above that for a daily setup you're likely going to hit diminishing returns. of course, as usual, you're mileage may vary.
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Old 04-11-2014   #8 (permalink)
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Default Re: Do I need space for my port to radiate

Well the reason I ask this is because me and my box builder are going over design ideas. I have 56 inches from door to door, 26 inches front to back, and 19 inches from the window line to the floor. With 1' thick MDF that leaves 12.75 cubes before port displacement. No sub displacement because I'm inverting them (to save space).

But now I think that I will have to decrease the width of the box (door to door) to accommodate for the port (aero port). So I will have to go above my window line which I really don't want but if I have to I will.

So now I'm thinking, to keep it that wide, to put the subs up facing the roof, along with the port. Will this work? I heard in trucks it's best to do subs up port side though...

He has yet to hit me back with his idea for size of port etc so when he does I will probably ask another question in this thread regarding it lol.
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Default Re: Do I need space for my port to radiate

I went over this the other day so here's the jist of it -

Quote:
Originally Posted by 666WMD View Post
That will work fine. Kon mislead you a bit with the port distance from the wall though. With a slot port it needs to be 1.5x the slot width away from a wall. If it is the same width away, it will extend the length and become part of the port. Anything less and it will render the port basically useless.
With a round port it needs to be a sufficient distance that the cylindrical area around the mouth of the port is more than the cross sectional surface area of the port. Ie: a 4" port has a cross sectional area of 12.56sqin (Radius x Radius x Pi = {2x2} x 3.14). The cylindrical surface area is found by Surface area divided by {Diameter x Pi}. So 12.56 / 12.56 = 1". 4 is a funny number because the surface area total is the same as the diameter. A 6" port would be 28.26sqin / 18.84 = 1.5". If you put the round port in a corner or against a wall it would then need to be further away. Basically you're safe if any round port is the same length away from any surface as it's own width.
I'd say using 6" ports, leave the port 2-3" from your cabin side and you'd be good.
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