Bass Tube design (Rough Sketch repost because I figured out how to add pics)

[SamIam71]

Believe it or not, these things would hit hard as hell. I am not sure of the exact dimensions, but it is close. Pipe was always 2" larger in diameter than sub. It was always 2' long. The port divide ran up 1'. I think the clearance was 1" and the port pcv pipe was 1 1/2".

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[hispls 5,000+ posts]

I think you're going to run into problems with a 1.5" port on any 12" sub with more than a couple mm of x-max

 

[SamIam71]

It may have been bigger. May have been 2 1/2 or 3. It had to be bigger than 1.5 though. I am going of memory. At least 20 years back worth of memory lol. They hit like the taxman on payday though. The shop building them for the most part was putting in earthquake subs and soundstream amps