On RE's website under the tech part of the site, there is a 5cubic foot box tuned to 35Hz for 2 12" drivers. The only problem is that there is no "g" The size of how long the port length should be. Know where I can find it?
Chris, your best bet is to call them. I have all the specs for their recommended single driver enclosures. However when I did the calculations on all the boxes, they came out a lot bigger and tuned a little lower than they say. For instance, the one they sent me for a single 15" at 30hz came out to be about 5cuft at 28hz. I did that because it it was tooo big to just be 4ft^3 and it made me wonder.
let me know if you want me to e-mail you the plans for that box (i have a view .jpg files of the blueprints, I guess you would call them that.