download WINisd pro. input your data and your amp power. see all the displays as graphs. Very good software.
It will also show just how little bass extension there is in a sealed box. Download Linkwitz transform design and read up on LF equalisation and Q adjustment. I recommend a Maximum of 10dB of LF gain to maintain good sound quality. Many use between 15dB and 18dB of LF gain. Be very careful with power going this EQ route. You can burn out the VC very easily or run out of Xmech and damage the driver.
