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The answer is yes. There is a smoother transition from the high pressure air inside your box to the low pressure air in your cabin. They are just more efficient.
------------------ Team ONE Louder - We GO to 11.
Running All Xtant Equipment in Street 1-2
Horn Boxes are just too damn hard, time to go back to a regular ported box.
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hmmmm, I need to attack my boxes with a 1/2" round router bit then....lol
Seriously, 2db? on the same meter? That's far more than I would have thought it would gain. You didn't do any other changes other than to round the edges? I really would like to know. It would be nice to pick up a db or 2 with so little effort. Steve
------------------ Check out Db Don's new site! My stats...not any yet TEAM BEYOND AUDIO
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The idea behind the Aeroports is in the flanges used on BOTH ends of the port, which are designed to prevent any air turbulance from interfering with a smooth air flow into and out of the port. This allows for better detail sonically as well as improved air velocity within the port which in turn is higher output levels to the ear. They do indeed work better than just rounding off edges on a non-flanged port.
On the same issue, any cabinet would sound better if ALL inside edges and corners were rounded off, including the hole cut for the woofer and port.
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E.C. Wuz here
Posts: 1057 | From: Vancouver, British Columbia, Canada 'eh | Registered: May 1999
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I've actually seen a loss in SPL as a result of rounded ports vs. straight edge ports. Its all about the frequency at which certain cars work. Try both and see which one works out for you. That's truly the only way.
------------------ Josh Schmillen In loving memory of Michael T. Schmillen Team Airlines
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by the looks of your diagram your port length got shorter. maybe you just ended up tuning the port closer to the tuning frequency of your car when you made the switch. that would explain why it peaked in the same place.
quote:Originally posted by Shedluv: I have gained almost a db from 2 6inch PVC to 4 4 inch aeroports, and that was a loss in port area.
That is not necessarily a factor of the aeroports or the difference in the port area. It could very well be a difference in the phase relationship between the ports and the driver. The Phase plot can be affected drastically with the length of the ports. What size subwoofer and enclosure are we talking about off the top of my head it seems that either way you had more then 50 square inches of port area.
------------------ Chris Dilbeck Ampman Audio Sales/Technical Support http://www.ampmanaudio.com
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7 cu ft total. 2 12s, 1000 watts of power. 6 inch ports were 9 inches long, 4s are about 9.5 inches long assembled. I used 2 of the same holes for the 4s, and then cut 2 more right next to them.
quote:Originally posted by Gummi: same meter.... first with rounded port...... then 15 minutes later with standard port..... both setups peaked at the same frkvensy.....54Hz......
Actually, as per "aero ports" the brand with the curved ends the owners manual says that the overall length of a straight port and their "aero port" should be exactly 1 inch longer for both ports to be of equal lengths. So your rounded port would actually make the box tuned a little higher than the straight port. I hope that made sense, like I said this is as per "aero ports' owners manual.
quote:Originally posted by manauta: Actually, as per "aero ports" the brand with the curved ends the owners manual says that the overall length of a straight port and their "aero port" should be exactly 1 inch longer for both ports to be of equal lengths. So your rounded port would actually make the box tuned a little higher than the straight port. I hope that made sense, like I said this is as per "aero ports' owners manual.
so he really has a 5.5 inch port, right?
------------------ Soon to be IASCA Novice 1-600 Competitor
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What about just getting the "ends" of aero ports and sticking them in normal PVC?. Would that essisentially have the same effect?. I'd love to try this. Where can I buy them, the whole aeroport, and also just the end (if possible.). Thanks. 2Db is a lot of sound, that would be sweet to gain!.
quote:Originally posted by winslow: No. The total length is still 6.5 inches. You cut the tube shorter to accomidate the length of the flairs.
Still the tuning of the enclosure does change by shortening the length of the vent when you use the Aeroports. The tuning is a function of the total cross sectional area and the length. The increased cross sectional area of the flange does give you the same volume of air within the port and flanges. However, The tuning still comes from the now shortened 4" constant cross sectional area.
Do an impedance plot on a subwoofer in an enclosure with a regular pvc port in it. Then shorten it by the 1" that is called for and place the aeroports in it. Then do another impedance plot. You'll find that the peak impedance will shift upwards by a small margin, indicating a slightly higher tuning frequency.
In simplified terms when the subwoofer moves back and forth it moves a column of air within the port. That air effectively acts as an air piston. It is the volume of air in the constant cross sectional area that determines the tuning frequency. With the aeroports the fact remains that the volume of air in that port is reduced due to the reduced length.
The belief behind these is that you still have the same amount of total volume within the port and flanges after shortening the tube for the aeroports as you do with the longer port which is correct. But the total volume of the air piston is reduced due to the reduced length of the constant cross sectional area. You can't "squeeze" the additional air from the flange area into the smaller cross sectional area. Does all that make sense?
------------------ Chris Dilbeck The Source South East Manufacturer Representative for Brax, Helix, Synopsis Audio, and Butler Audio
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