can anybody give me the right dimensions to 2 12" type r's? maybe around the 30 to 35 htz area. i'm considering either round ports or the slots. if you don't know, maybe refer me to one of the online calculators. i know there are some, but i can't find any.
dont use round ports if you can get away with this--try sloted with the wood from enclosure--premade ports are not sturdy thus vibrating and induceing noise--also will pickup port noise-low sonic whistleing sound-the birds will love you!!!