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Silver Member Username: HeavybHopkins, Sc Usa Post Number: 150 Registered: Jul-04 | hey i went to a website that this site recomended to see what the diameter of my port would need to be to not get port for a vmax 15 and it gave me a figure of about 9 inches. that is huge!!! i thought u only needed a 6 inch port for a 15. please explain this to me. this has confused me. |
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Silver Member Username: InsearchofbassPost Number: 824 Registered: Jun-04 | ok blare i ran a box size of 3 cf. for a 15. which can happen for a woofer of that size at 35 hz and it came out to a port volocity of .05 at 500 rms power; and that is a number you would want to shoot for volocity wise for an spl box. Now take that same woofer and tune it lower or add more power to it and you have even more port volocity. So now you can see why they recommend one 9 inch port. (by the way the port came out to 40 inches long) A slot port would be called for. |
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Gold Member Username: Jonathan_fGA USA Post Number: 2127 Registered: May-04 | Anything under about .17 would be good, at least that should keep it from getting noisy. You could probably go with 2 4" ports or one 6" port and get good results, w/ a lot less port length. |
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Gold Member Username: Jonathan_fGA USA Post Number: 2129 Registered: May-04 | Of course, lower is better, but sometimes space doesn't allow it. .17 m/s is 5% of the speed of sound, by the way. |
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Silver Member Username: HeavybHopkins, Sc Usa Post Number: 154 Registered: Jul-04 | if u do a slot port how wide does it need to be for 12s and also 15s |
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Silver Member Username: InsearchofbassPost Number: 829 Registered: Jun-04 | blare its really dependant on the power the box size and the port tune try this site out with a few box ideas and youll see what im talking about http://www.linearteam.dk/default.aspx?pageid=ventcalculator |
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Silver Member Username: InsearchofbassPost Number: 830 Registered: Jun-04 | use the link i gave previously to get the feel for things by checking the port volocity then use this link to understand the slot port idea |
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Silver Member Username: InsearchofbassPost Number: 831 Registered: Jun-04 | sorry after you go there go to tech support then click calculators |
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New member Username: ClevelandPost Number: 5 Registered: Oct-04 | i would only do a port job if you want spl ? go with seald if you want sound quality ? thats my long expereance!!! |
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Silver Member Username: InvainMichigan United States Post Number: 243 Registered: Aug-04 | Actually dick, if you have a ported box built and tuned correctly, you can still achieve good sq. And you can still get great spl with sealed boxes. I know you may reach higher decible's with ported boxes, but IMO sealed sounds a lot nicer. It's cleaner and tighter. |