Here is the setting we used for our distorted bass (Don't know if it's the sound you are after, but hopefully it will help you somehow).
Spector Legend 4 w/ Elixir strings --> Maxon OD808 --> Marshall Jackhammer (overdrive mode) --> Ampeg SVT4 Pro.
I routed a clean line (before the pedals) with a boss line selector (Y mode) into my fireface's instrument input. Limiter on.
The other signal went into the dirt pedals, then into the amp.
The cab (ampeg 8 x 10) was miced with:
AKG 414, SM57 and E602. You should check your phase, though for me it was just a matter of pointing the 3 mics on the classical cone/dustcap fashion, barely touching the cab grill. I checked the phase and they were all in perfect alignment. For obvious reasons the D.I. was a bit offset, but it was easy to align it on Cubase. Sorry for the shitty cellphone pic!
On the mix I used the clean DI channel for the lo-mid frequencies, using a lo-pass filter to cut everything above 800Hz. It gave some nice thick body to the sound.
The 414 mic was the most "representative" and of the sound, having both a nice detailed crunch and warm low frequencies so I just boosted a couple dbs of hi-mids and set it relatively high on the mix of the 4 bass channels.
The 57 added the mid-dirty crunch, so I cut everything except the hi-mid frequencies. It was the "crunch factor" channel.
The 602 had some mega bass freqs, as some high frequencies crunch. We used just a bit of this mike on the mix, which made the sound "bigger" (it made a nice improvement, no matter how low it was in the mix). No eq on this channel.
Looking (listening?) to the results, I guess the 4 channels (that may sound like overkill for some) had their particular qualities that at the end made (IMMV) a full, big bass sound with very few post production.
We just used some eq to cut redundant frequencies, so every channel had its place in the freq spectrum, and that's it. No compressors, no modellers ... nothing else. It was all a matter of tweaking the level of the 4 channels to taste.
Here's the result (either of the 3 songs):
http://www.soundclick.com/jumungus
I hope it helps!
Cheers