port tube length

I'm making my first ported sub box for a 15" MTX thunder 6000 4 Ohm and the box volume i'm gonig to be making is 3.5ft^3 and it calls for (2)4"x15" vent. Do they really make port tubes that long and if they do where can i get one that curves becuase the box is to small for 15" length.

Yes, they do make port tubes that long. If you look on partsexpress.com you can find a port that has that length. In order to be able to fit the port in your enclosure you should get a 90 degree bend. If you go to a local hardware shop such as Lowes you can find a 90 degree PVC fitting that will work. There are a few different sizes depending on the thickness of your port but you should be able to find one that will work.

will the 90 affect sound performance and also if you are using a pvc elbow why cant you use the pipe as well?

nafarious21 wrote: will the 90 affect sound performance and also if you are using a pvc elbow why cant you use the pipe as well?

You can use a PVC pipe if you wanted. The 90 degree elbow will not effect sound quality. I would look for something like this for an elbow for an example...

alright thanks i learned something. oh and also the port tube calculator on this website says that the length should be (i cant remember exactly) 4" but the manual says 15" should i just stick with the manual?

can anyone help me with this one?