The low mid mud of bass lives around 200-300 for me on my 'clean' bass track, I use the Ampeg on the Ultra for that, and its quite a flobby and honky sound to start with, love the low-lows on it though, do strategic cuts on the bass around where the body of the toms are, especially higher toms around 200-300, and the body of the snare around the same area.
Bass is one of the instruments I don't mix solo'd, you listen on another day or in another room and its all over the place.