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  #1  
Old 06-04-2014, 05:06 PM
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Default port help please

Im in the process of building a box for my 2 18" dc audio level 5 m1.here are my deminsions can you tell me if the port looks correct. Thanks in advance


Wood Thickness - 1 inches
Displacements - .52 cubic feet

Frequency - 29.49 hz

Box Length - 48 inches
Box Width - 37 inches
Box Height - 23 inches

Port Length - 30 inches
Port Width - 35 inches
Port Height - 5.5 inches

Gross Volume(Feet) - 19.57 ft³
Gross Volume(Litres) - 554.16 L
Net Volume(Feet) - 14.39 ft³
Net Volume(Litres) - 407.29 L
Port Displacement(Feet) - 4.66 ft³
Port Displacement(Litres) - 131.96 L

Port Area - 192.5 in²
Port Area(Metric) - 1241.94 cm²
Port Area Per Foot - 13.38in²
Port Area Per Litre - 86.32cm²
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  #2  
Old 06-04-2014, 06:20 PM
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port looks fine
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Old 06-04-2014, 07:54 PM
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Thank you
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Old 06-04-2014, 08:10 PM
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Any way you can get that port closer to being square? 35x5.5 is quite skinny. It will work, but will be less efficient and therefore not as loud as a more evenly shaped port.

Also, wish i had room for a 20 cuft box!!!

What is your bracing displacement?
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Old 06-05-2014, 03:31 AM
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Quote:
Originally Posted by SCS_Audio View Post
Any way you can get that port closer to being square? 35x5.5 is quite skinny. It will work, but will be less efficient and therefore not as loud as a more evenly shaped port.

Also, wish i had room for a 20 cuft box!!!

What is your bracing displacement?
A square port or rectangle port....I wouldn't think there would be a difference in SPL if using same subs. They don't have to be even imo.
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Old 06-05-2014, 06:41 AM
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Originally Posted by Boomintahoe View Post
A square port or rectangle port....I wouldn't think there would be a difference in SPL if using same subs. They don't have to be even imo.
When your length to width ratio is large, you have more surface area in the port per cross sectional area. It's the same theory why one large port is better than multiple smaller ports. Round has the best ratio, then oval, squares the next best, and then rectangle.

Think of it this way. You have an 8" round port vs a 25" x 2" slot port. They are both 50in^2 of cross section, but the round has 25" of surface area in the port vs 54" for the slot port.

Port is everything....and the more efficient it is, the louder you can get on a given amount of power.
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2013 MECA Park & Pound 2 World Champion - 130.6 (Teammate)

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Old 06-06-2014, 04:14 AM
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Quote:
Originally Posted by SCS_Audio View Post
When your length to width ratio is large, you have more surface area in the port per cross sectional area. It's the same theory why one large port is better than multiple smaller ports. Round has the best ratio, then oval, squares the next best, and then rectangle.

Think of it this way. You have an 8" round port vs a 25" x 2" slot port. They are both 50in^2 of cross section, but the round has 25" of surface area in the port vs 54" for the slot port.

Port is everything....and the more efficient it is, the louder you can get on a given amount of power.
I haven't seen, if none at all, oval ports....show me someone using one right now?? Round isn't always best simply because lots of bassheads use vents...rectangle or square to gain the most SPL possible. Or even a daily street beater yields the same. I also might add that square has more area than round.

I agree somewhat port isn't all that. It's also in the box too. A properly designed and built one.

I don't think you follow my reply. So if I had a choice of a vent either square or rectangle for the same enclosure, same subs, same power, same ratio, same vehicle, same area in the vehicle the sub enclosure is going in, ....I don't think the shape of the port would matter. Would it?
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Last edited by Boomintahoe; 06-06-2014 at 04:17 AM.
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  #8  
Old 06-06-2014, 05:46 AM
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Quote:
Originally Posted by Boomintahoe View Post
I haven't seen, if none at all, oval ports....show me someone using one right now?? Round isn't always best simply because lots of bassheads use vents...rectangle or square to gain the most SPL possible. Or even a daily street beater yields the same. I also might add that square has more area than round.

I agree somewhat port isn't all that. It's also in the box too. A properly designed and built one.

I don't think you follow my reply. So if I had a choice of a vent either square or rectangle for the same enclosure, same subs, same power, same ratio, same vehicle, same area in the vehicle the sub enclosure is going in, ....I don't think the shape of the port would matter. Would it?
Someone using an oval port? How about the one my friend Jordan Smith and i built lol. DbDrag Street trunk 4K loudest car from last year. It's oval because it maximized port area, but stayed as close to round as possible. It's all about airflow. Corners, sides, bends, non flared edges, they all impede airflow and that is a bad thing.




As far as square being larger than round.... you are not following my mathematics. I am finding the ratio of cross sectional area as it compares to surface area (wall area). Yes a 10" x 10" (100 sq-in) square port has more cross sectional area than a 10" round. But, what I am saying is, it also has more wall surface area (and corners) than a comparable 11.28" (100 sq-in) round port. It has about 113% more surface area for the same cross section.
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2013 MECA Park & Pound 2 World Champion - 130.6 (Teammate)

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  #9  
Old 06-06-2014, 05:59 AM
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This is another example of oval port:
Todd Dupler 01 jetta build log
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Old 06-06-2014, 07:49 AM
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Quote:
Originally Posted by craiggus365 View Post
This is another example of oval port:
Todd Dupler 01 jetta build log
Yea, Todd's daily port on page 4 is an oval with about the same shape as ours. Hope we see him at a show this year! I really want to hear it!

His SPL port is technically a slot port with rounded ends since an oval has no flat sides, but he was doing exactly what we were doing...trying to fit as much port in there as possible lol !!!
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2013 dB Drag Street Trunk World Champion - 153.9 on 3200 clamped Watts (Teammate)
2013 MECA Trunk 1 World Champion - 152.8 Headrest (Teammate)
2013 MECA Park & Pound 2 World Champion - 130.6 (Teammate)

Checkout our build and videos !! : )
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