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Bronze Member Username: 50ampsOntario Canada Post Number: 19 Registered: Sep-04 | If i have a 3 cubic foot box with a round port with a diameter of 3 inches and a length of 8.75 inches giving it a 24 hz tune, would this create port noise? Should i go with a wider port for the shiva? Thanks |
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Bronze Member Username: 50ampsOntario Canada Post Number: 20 Registered: Sep-04 | btw the port ends would be flared. |
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Bronze Member Username: RedskinLondonEngland Post Number: 80 Registered: Dec-03 | 4" minimum for a shiva. |
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Silver Member Username: HeavybHopkins, Sc Usa Post Number: 147 Registered: Jul-04 | what about a 12 or 15 vmax |
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Silver Member Username: InsearchofbassPost Number: 779 Registered: Jun-04 | blare for the shiva you will need two 3 inch ports 9.75 inches deep for a port volocity of .14 acceptable being less than .16 and thats at a power of 300 rms if you apply more power port volocity will go up the v max in the same box will produce the same at this box size and port size and length and power ps...im assuming this box size would be after displacements of ports and sub |
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Silver Member Username: InsearchofbassPost Number: 780 Registered: Jun-04 | also.....port tune would still be at 24 hz with my ports suggestion assuming thats 3 cf after displacements |
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Silver Member Username: InsearchofbassPost Number: 781 Registered: Jun-04 | opps blare ......repost thats two 3 inch ports at 19.75 inches long for 24 hz tune at .14 port volocity acceptable being up to .16 (300 rms) |
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Silver Member Username: FishyTamarac, FL USA Post Number: 257 Registered: Sep-04 | If you don't mind spending a lil extra you might want to check out Adire's flared port kits. They claim "chuffing" equivalent to that of a regular 5 inch port for the 3 inch kit. http://www.adireaudio.com/ goto car audio/flared port kits FP3 is their 3 inch kit, FP4 their 4. http://www.adireaudio.com/Merchant2/merchant.mvc?Screen=CTGY&Store_Code=AA&Categ ory_Code=5000 -Fishy |
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Bronze Member Username: 50ampsOntario Canada Post Number: 21 Registered: Sep-04 | thanks for the input guys. Would port noise be a problem even though the length of the port is only 8 inches and both ends are flared. That said, would a slot port be better in this situation,than a round port? would there be less port noise even though it's longer? thanks |
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Silver Member Username: InsearchofbassPost Number: 785 Registered: Jun-04 | oh sorry this post was for steve not blare there you go buddy |
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Silver Member Username: InsearchofbassPost Number: 786 Registered: Jun-04 | yes steve your original port would be a big problem (cant use that tune with that size port) Your best alternative would be to with the two 3 inch ports 19.75 inches deep (.14 for .16 being max volocity allowed at 300 rms) or if you wanted to make double sure go with fishys suggestion |
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Silver Member Username: InsearchofbassPost Number: 787 Registered: Jun-04 | ps..a wider port or increased number of ports the same diameter requires more port length creating less port resistance but if you did a slot port with turns you could overcome the depth issue but doing so requires accounting for bends using the proper equasions |