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  #1  
Old 04-24-2014, 06:22 PM
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Default port area

Hello im trying to learn how to design boxes but im stuck with the port area. I know the general rule of 9-12 inches for aeros and 12-16 for slots. So my question is when do u use the low side or higher side of port area?
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Old 04-25-2014, 08:05 AM
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Someone can chime in if I'm wrong, but I've always used the smaller area if I'm going for more of an sq build

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Old 04-25-2014, 08:52 AM
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Port area depends on several factors. Mainly subs specs and tuning goal.
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Old 04-25-2014, 09:00 AM
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If you are going for a lower tuning it will be easier to achieve it with the lower end of the port area ratio. For and SPL build you want to get as much port area as possible while still having good compression. The other thing port area effects is port velocity. Less area = more velocity and a better chance of port noise so you have to be careful
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Old 04-25-2014, 09:08 AM
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there is so much more to port area than going with a general rule. that's a lot for aero ports. I personally use 4-9 sq in for aeros, 6-10 sq in for round, 12-16 sq in for slotted or rectangular. i use BBP6 so that there is no question when I start building. I've had many installers that I work with try to tell me "you're wrong" when I tell them what I'm building for a specific enclosure but once they see how it plots on a graph compared to what they think they know. when it comes to port area and you are wanting to go "small" you'll most likely encounter port noise. I always stay between 20-30 m/s for pv which the rule of thumb usually keeps pv in the safe realm of 15-25 m/s. when building port enclosures I personally believe it's all about getting the velocity right. if I plot an enclosure and the velocity is less than 20 m/s, I keep making adjustments till I get over the 20 m/s mark. when i first started off I thought I knew what I was doing but I look back and see there was little to no velocity. those boxes sounded good but now I'm more about the velocity. now all my boxes now sound awesome and move air like fans w/o noise.
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Old 04-25-2014, 09:14 AM
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Quote:
Originally Posted by fasfocus00 View Post
there is so much more to port area than going with a general rule. that's a lot for aero ports. I personally use 4-9 sq in for aeros, 6-10 sq in for round, 12-16 sq in for slotted or rectangular. i use BBP6 so that there is no question when I start building. I've had many installers that I work with try to tell me "you're wrong" when I tell them what I'm building for a specific enclosure but once they see how it plots on a graph compared to what they think they know. when it comes to port area and you are wanting to go "small" you'll most likely encounter port noise. I always stay between 20-30 m/s for pv which the rule of thumb usually keeps pv in the safe realm of 15-25 m/s. when building port enclosures I personally believe it's all about getting the velocity right. if I plot an enclosure and the velocity is less than 20 m/s, I keep making adjustments till I get over the 20 m/s mark. when i first started off I thought I knew what I was doing but I look back and see there was little to no velocity. those boxes sounded good but now I'm more about the velocity. now all my boxes now sound awesome and move air like fans w/o noise.
I think with my 38hz SPL port in my port velocity is 130fps... I don't care how that port sounds, the daily port sounds great...lol
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Old 04-25-2014, 09:40 AM
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Old 04-25-2014, 10:07 AM
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Quote:
Originally Posted by fasfocus00 View Post
there is so much more to port area than going with a general rule. that's a lot for aero ports. I personally use 4-9 sq in for aeros, 6-10 sq in for round, 12-16 sq in for slotted or rectangular. i use BBP6 so that there is no question when I start building. I've had many installers that I work with try to tell me "you're wrong" when I tell them what I'm building for a specific enclosure but once they see how it plots on a graph compared to what they think they know. when it comes to port area and you are wanting to go "small" you'll most likely encounter port noise. I always stay between 20-30 m/s for pv which the rule of thumb usually keeps pv in the safe realm of 15-25 m/s.[/COLOR] when building port enclosures I personally believe it's all about getting the velocity right. if I plot an enclosure and the velocity is less than 20 m/s, I keep making adjustments till I get over the 20 m/s mark. when i first started off I thought I knew what I was doing but I look back and see there was little to no velocity. those boxes sounded good but now I'm more about the velocity. now all my boxes now sound awesome and move air like fans w/o noise.
Very good info but you lose me with the"m/s"
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Old 04-25-2014, 10:35 AM
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Meters per second = m/s. It is the speed that the air is moving in and out of your port. Too much speed and you get port noise, too little speed and you lose compression inside the enclosure.
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Old 04-25-2014, 11:35 AM
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Boundary layer and turbulence is your enemy but port compression is your friend.

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