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I went to Lowes last night with a 4" Dayton tube and a 3" Precision Port tube. I went to the plumbing section and found the 4" sewer pipe elbows fit the 4" tube quite well. 2 90 degree elbows hooked together form a nice, gentle arc and give about 19" of port length. I'll just use a short section of the Dayton tube on both ends to connect the flares and will easily get a 30" port in this box.
For the 3", a series of schedule 30 PVC 45 degree elbows also make a fairly gentle arc, and fit good enough to the tube that a seal will be pretty easy, although I haven't measured the length yet. If I wanted to, I could get 2 30" long 3" precesion ports in the box, which would give me the same 18hz tune with slightly less air speed.
A word on the Dayton port kits. The elbow they supply is a very sharp bend and one end is male and one is female. They don't have any couplers in stock to connect a pipe to the male end of the elbow, (they wouldn't even show up in a search with the part # they gave me) so you'll need to find something locally anyway. Also, the fit and finish on the flares is not the greatest. This sub is going to a customer, so I can't send it out with a scuffed up port flare. And they wont just send me a new one, they are sending a shipper 1st, then I have to send this one back before they will ship a new one. :angry:
For the 3", a series of schedule 30 PVC 45 degree elbows also make a fairly gentle arc, and fit good enough to the tube that a seal will be pretty easy, although I haven't measured the length yet. If I wanted to, I could get 2 30" long 3" precesion ports in the box, which would give me the same 18hz tune with slightly less air speed.
A word on the Dayton port kits. The elbow they supply is a very sharp bend and one end is male and one is female. They don't have any couplers in stock to connect a pipe to the male end of the elbow, (they wouldn't even show up in a search with the part # they gave me) so you'll need to find something locally anyway. Also, the fit and finish on the flares is not the greatest. This sub is going to a customer, so I can't send it out with a scuffed up port flare. And they wont just send me a new one, they are sending a shipper 1st, then I have to send this one back before they will ship a new one. :angry:
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