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Old 08-06-2013, 12:47 AM
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Default Port Area

I've been thinking it over, and i don;t understand why the port area is based on the size of the box, instead of the driver displacement?

It seems like there should be larger ports for drivers that move more air, instead of there needing to be more port area for a larger box volume?

I would also like to understan what happens when you leave the recommended range of port area for a particular build. What happens if your port is too big, or too small for the box volume?

Anyone care to explain?
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Old 08-06-2013, 12:58 AM
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Port area can be complicated. Depends on if it's a ported box, or bandpass. Or if it's in a car or in a house. Too big of port, you lose some quality, maybe will sound muddy, but the biggest loss is in bandwidth. Too small and you get port noise and decreased output/SPL.

It's really situation dependent. Even with ported boxes, say with my 2 18's. I have 12.3 in^2 per cube port area @ 29 hz. But if I was to go for a SPL it'd be more like 16+ in^2 per cube. So port area can vary tremendously. Some aero boxes I've done only have like 4-5 in^2 per cube and performed very well.

When there is more air in the box for the woofer to move, there is more air coming out of the box...think of it that way and that's why you have to have a bigger port.

Also, as you tune lower, your air speed in the port will lower as well given all other variables stay the same.
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Old 08-06-2013, 07:33 AM
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Quote:
Originally Posted by jt_buck View Post
Port area can be complicated. Depends on if it's a ported box, or bandpass. Or if it's in a car or in a house. Too big of port, you lose some quality, maybe will sound muddy, but the biggest loss is in bandwidth. Too small and you get port noise and decreased output/SPL.

It's really situation dependent. Even with ported boxes, say with my 2 18's. I have 12.3 in^2 per cube port area @ 29 hz. But if I was to go for a SPL it'd be more like 16+ in^2 per cube. So port area can vary tremendously. Some aero boxes I've done only have like 4-5 in^2 per cube and performed very well.

When there is more air in the box for the woofer to move, there is more air coming out of the box...think of it that way and that's why you have to have a bigger port.

Also, as you tune lower, your air speed in the port will lower as well given all other variables stay the same.
Whats ur range u do for aeros. And would u count round port as a aero as in sonic tubes. I have always just calculated how much area i need and used a sonic tube to get that area
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Old 08-06-2013, 08:39 AM
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i prefer tubes for saving space but like the added structure and stability u can get w the extra wood from a slot. Like the tuneability of a round port also.
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Old 08-06-2013, 08:53 AM
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Aeros usually need less port area too as there's no sharp corners or bends usually to get the air in a bind. I use 1/2 the port area needed for a slot when I do aeros. Except in 4th or 6th's.
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Old 08-06-2013, 09:02 AM
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Tuned in for this discussion

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Old 08-06-2013, 10:21 AM
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Quote:
Originally Posted by vince79vette View Post
Whats ur range u do for aeros. And would u count round port as a aero as in sonic tubes. I have always just calculated how much area i need and used a sonic tube to get that area
well its sono tube's not sonic tubes lololol
and the general rule for aeros is 6 to 10" per cube..
and yes any round style port is considerd "aero"
a 8" diameter sono tube has like 50.24 sq inches of port
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Old 08-06-2013, 11:01 AM
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Too bad winisd doesnt account for porr area in its response curves :/ and I know I know winisd doesnt mean anythig but its cool to see what changing variables does. It will tell you about air speed in the port tho. I thought it was the lower the tune freq the faster air moves tho right I tuned at 10hz once it was fun
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