So finally got around to doing some testing with the im-sg. Here are my results for seeing how my boxes useable bandwidth is:
The Fl came out 44hz at around 6.5ohms
The Fh came out to 63,5hz at around 8ohms
and the Fb came out to 50hz at around 3.2 ohms.
My useable bandwidth is 44-63hz if I did this correctly.
So is this telling me my ported side is tuned to 50hz or 44hz ???
Thanks for the help.