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Anonymous | I built most of my box that is tuned to 35hz and i need to know which would be the better port 3 4" round ports which is 15.5" long or 37 sq/in. port which is 15.5" long? |
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Anonymous | bump |
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Anonymous | bump |
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Anonymous | help please lol |
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Anonymous | bump |
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Gold Member Username: Tdeaton1021Near Tampa, Florida USA Post Number: 1869 Registered: Sep-04 | tuneing changes when there is more than one port what im saying is if you have 3 4inch ports 15.5 inches long and you have 1 6.8inch appx port 15.5inches long they will have a different tune. also, slot ports and square ports that are same length have a different tune. the slot ports tune would be lower. also the single port tune over the multiple port tune would be lower. |
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Gold Member Username: Tdeaton1021Near Tampa, Florida USA Post Number: 1870 Registered: Sep-04 | tuneing changes when there is more than one port what im saying is if you have 3 4inch ports 15.5 inches long and you have 1 6.8inch appx port 15.5inches long they will have a different tune. also, slot ports and square ports that are same length have a different tune. the slot ports tune would be lower. also the single port tune over the multiple port tune would be lower. |
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Anonymous | what is the difference between square ports and slot ports? |
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Silver Member Username: RzarectorCoquitlam, Bc Canada Post Number: 930 Registered: Dec-04 | nothing .. if u have a square port with a lets say 20 " cross section and a round port with the same and they are tuned to the same frequency there will be no difference.. a port, no matter what the shape is to tune a box to a specific frequency.. and so long as its big enough to avoid port noise (unpleasant sound when ports are to small) it wont make a difference... the bigger thing to worry about is the placement of ports on a box.. |
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Gold Member Username: Tdeaton1021Near Tampa, Florida USA Post Number: 1889 Registered: Sep-04 | not so, a slot port does not need as much length as a round port or square port to get as low of a tune. this is because a slot port uses the enclosures wall as part of the port. check it out for yourself. http://www.carstereo.com/help/articles.cfm?id=31 put in a net volume, a tuning frequency, then select square port. put NOT a slot port. put in your port H and W. now find port legnth. change form NOT slot port to SLOT PORT and you will find the port length gets shorter. |
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Gold Member Username: Tdeaton1021Near Tampa, Florida USA Post Number: 1890 Registered: Sep-04 | oh oops sorry, yes that is correct, if tuned to the same frequency there shouldnt really be a difference. people like slot ports though because you can get a larger port area easier with them over round ports which will reduce chance or port noise. that is why there are flared ports for a smoother transition of air flow. |