if you have a good D.I box it will help alot.

alot of bass recording are made good becuase there is a good bass signal present coming from a good di- and a good pre-amp and a good bass amp
somtimes its both sometimes only one of them- but if you have a good bass gtr and player and great arrangments then it will alwys work
but in case you need things to become more stable and thick its good to use a di that will make the sound thick

i am using this d.i

http://www.adesignsaudio.com/reddi.html

its the best D.I i have ever used

it so smoth and loud- i actually connected it to line level input on the neve and not even gained it up and it has a levels buttun that amplefies it and give it more energy
its not a cheap DI but its so good it just puts the bass in place
it also round the high end in a nice way that you can hear all the important information but still make it warm and big
i se it in some recording with an amp (ampeg SVT claasic original ) and even without an amp or with other bass amps too.
its also giod for other stuff

by the way there are also other great products from that company


http://www.adesignsaudio.com/products.html