hey, I produce mostly heavy rock and big electric sounding stuff.
to record electric bass I find a good room, not too small (without too much rumble in the walls/windows/bookshelves) Put the cab in there!
I like to leave the head out were I am (if possible) so i can tweak without walking downstairs or wherever (long speaker leads post amp so no noise/loss to speak of).
On the head near the input I put my DI box (Radial or REDDI Tube DI preferably). I place a mic (beyer m88/Opus 65, or flavor of the month large d' condenser/tube condenser/whatever) on the best sounding cone in the cab, right in the middle, where the biggest BASS comes from and as close to the grill as possible/practicable for max proximity effect.
Power it up and get the bassist to play while you tweak. At this point I shoot for cool sounding mids. Lows will come on later when you're correcting the phase and time but I believe cool mids is where a good bass sound is at
(at this stage).
Once ALL the tracking and ALL the editing is done I go into my edit window, select the WHOLE bass cab signal and go smaller and smaller and smaller till i reach the sample rate (or close to it).
Move the cab signal/wave (backwards in time ie LEFT) by hand and eye and ear to match the DI signal/wave
(DI always arrives first).
Match peaks with peaks and dips with dips and the waves should pass threw 0' (zero degrees) at around the same time.
If you've dun it right you can pretend the two signals are each side of a great bendy road as you scroll forward.
As you scroll along the page the road should never get too skinny and never getting too wide, haha..
Then you've got perfect phase and BULLSH*T LOWS.

To check if the phase is right on, Invert one of the signals and hear how it goes from wimpy to knife-fight when you undo it while playing back.
*but lookout you might kick the cones right out of your monitors !!
hope this helps : )