ok Just rang the installer here is his Question Verbatim lol I am no box or speaker expert and will never claim to be hence why I am trying to find someone else to build the box for me and hitting dead ends lol .. I always thought programs like Bass Box pro would work this out .. lol Anyways the Question is for two 12"q's Going slot port Tuned to 32 Hertz. Need to know the exact port dimesions Eg port opening length, Width and Size.. Again don't shoot the Messenger lol I am only passing on his question ... Thanks for the quick response .. Trev