quick T line question

[jroo]

I found an old T line design I had for a single 8" sub. Off the top of my head, I think the line length was set up for 35hz. If I wanted to add another of the same 8", I would just have to double the port area but would leave the line length alone?

[Joe X]

Yes, just like if you were to build a second identical box and put it on top.