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  #31  
Old 09-25-2015, 09:49 PM
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What is 16+ ^2
I believe he is saying 16 square inches of port area, minimum.
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  #32  
Old 09-25-2015, 10:38 PM
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I believe he is saying 16 square inches of port area, minimum.
Ive got no idea how to use that information
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Old 09-25-2015, 11:20 PM
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Ya 16 square inches of port, at least.
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  #34  
Old 09-25-2015, 11:35 PM
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Ive got no idea how to use that information
The Height x Width of the slot should add up to > 16".
Say you have a 12" sub, you add 1.5" for top and bottom wood, that leaves 12" of height for the slot. Then you should use 1.5" min for the width, that means 12x1.5=18. That is 18 square inches of port, now you use math or modelling program to figure enclosure size, and port length for that port area and desired tuning.
WinISD will work but won't calc the displacement of the port.
BBP will calc the displacement but you need to get creative with the dimensions of port material to account for a slot.
Torres will account for displacement but you can't model the response. I believe the CT app will do similar to Torres.
The 12volt and CA IIRC have port calcs too.
Pick your poison, and play around.
Somebody here can look over the design and you are ready to break out the jig/circular/table saw.
Did I make it sound easy? Maybe not, but the satisfaction, it'll make your month.

PS = you can get away with less port area with PVC, plus it displaces less so enclosure can be smaller.
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Old 09-26-2015, 12:08 AM
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^ that isn't exactly correct. Port area is based per cubic foot. 16^2 represents 16" per cube, not total. He actually needs about 36-40" for 2.25-2.5cu.
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  #36  
Old 09-26-2015, 09:50 AM
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^ that isn't exactly correct. Port area is based per cubic foot. 16^2 represents 16" per cube, not total. He actually needs about 36-40" for 2.25-2.5cu.
Thank you for correcting me, I never designed that way. I always model in BBP or WinISD and watch the vent speed.
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Old 09-26-2015, 11:04 AM
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If nobody else chimes in, I'll do a box plan for you. I'm far from a pro, but I know what I'm doing for the most part. Hopefully someone more knowledgeable chimes in
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