Do I have enough port

[burro breath 10+ year member]

Ok so my box is 6 cubes and I have an 18 inch recone from team psi and I will be sending it around 800 watts and I have a 6 inch aero port that is 16 inches long. Is that correct for my box and woofer? I know this is a newb question and I tried the search button already for those who are gunna recomend it.

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[DNick454 10+ year member]

A 6 inch tube has a cross-sectional area of just a hair over 25 sq. in. The rule of thumb for a typical slot port is 10-16 sq. in of port area per cubic foot of net volume. For a slot port, that would put you at 60-100 sq in of port. According to test results, by utilizing aero ports, you can use up to 50% less port area with aero ports and still achieve the same airflow without restriction or turbulence. That would still put you at 30-50 sq. in of port area needed for a box of that volume. An 8" port would put you at 50 sq.in of port, but... it might require too long of port than you could fit into the box. If you used three 4" ports, that would put you at 37-38 sq. in of port area which would be perfect.

Just for reference, if you were to use a 6" aero port that was 16 inches long in a 6 cubic foot box, that would put your tuning at roughly 25Hz lol. I'm not sure what you're using this setup for, but that would be way too low for a reasonable car setup (unless you're just trying to impress people with crushing lows or using for a home-theater setup).

Can you give me the dimensions of the box: width, height, and depth? I can get a better idea for what would be possible as far as port options.

 

[DNick454 10+ year member]

Crunched a few numbers... 8" port would work great in your case. An 8" aero port would supply more than enough port area for your application and with a 5.6 cubic feet (I'm assuming the box itself is 6 cubes... you've gotta account for the volume the sub and port itself will take up) you will end up with a port around 14" long and get a tuning of 35Hz which is a little more useful for daily music listening.

 

[burro breath 10+ year member]

I used an aero port because the box is not square. It has a slanted back and 2 slanted sides. And as my setup is right now do u guys think it is ok?

 

[DNick454 10+ year member]

A single 6" aero is not enough for 6 cubes. You need atleast a single 8" aero port or three 4" aero's.

 

[burro breath 10+ year member]

What if I shrank the box to 4 cubes

 

[DNick454 10+ year member]

Well, that would solve one problem but present two more. Yes, by shrinking the box to 4 cubic feet, a 6" aero port would be acceptable. The problem then is volume for the sub itself. 4 cubic feet is more 15" territory. Ontop of that, when you shrink net volume, the port has to be longer to achieve the same tuning. That 16" port you originally calculated for will have to be quite a big longer, and in a box that is now smaller, so I doubt it would fit. What are your workable dimensions for this box?

 

[mazdakid 5,000+ posts]

It might be a little easier to put a bigger sonotube where the 6" port is now than it would be to cut the box down 2 cubes.

 

[SmokeyDog 10+ year member]

A 6 inch tube has a cross-sectional area of just a hair over 25 sq. in. The rule of thumb for a typical slot port is 10-16 sq. in of port area per cubic foot of net volume. For a slot port, that would put you at 60-100 sq in of port. According to test results, by utilizing aero ports, you can use up to 50% less port area with aero ports and still achieve the same airflow without restriction or turbulence. That would still put you at 30-50 sq. in of port area needed for a box of that volume. An 8" port would put you at 50 sq.in of port, but... it might require too long of port than you could fit into the box. If you used three 4" ports, that would put you at 37-38 sq. in of port area which would be perfect.
Just for reference, if you were to use a 6" aero port that was 16 inches long in a 6 cubic foot box, that would put your tuning at roughly 25Hz lol. I'm not sure what you're using this setup for, but that would be way too low for a reasonable car setup (unless you're just trying to impress people with crushing lows or using for a home-theater setup).

Can you give me the dimensions of the box: width, height, and depth? I can get a better idea for what would be possible as far as port options.

not to thread steal'''''' but wpold an regular 4'' pvc port be the same as an aero port if i flare out the ends a lil bit? got ruffly 9.05 cf after displace ment but with port displacement . 38 hertz i am thinking 6 4'' round ports. that would be 75ish sq inches of port area. all calculators say i should have 105 plus. but you say you only need 50% of what a sq or slot port needs. makeing what i need 40 or so real comfused

 

[DNick454 10+ year member]

Depends how much you flare the ends. You can only flare the PVC so much before it becomes too thin. If you're talking about simply using a roundover bit on the face of the box where the port is mounted, that's not "quite" an aero port. Rounding over the edges does give an "aero effect", but it's a smaller radius flare. True aero ports have a very large, and smooth, flare and also have pre-drilled holes for ease of mounting. Yes... they are quite expensive for what they are, but they are worth it IMO. If at all possible, get the real thing.

You CAN however use regular PVC pipe and round the ends, just don't expect them to be quite as efficient. 75 sq. in of port area should be ok thought for 9 cubes if you atleast flare both ends a little bit.

 

[SmokeyDog 10+ year member]

thank you

 

[amartin_72]

I sell 8's theyre good for 15's and 18's.