My input signal chain for recording my bass rig is:
1) AT4047 mic - HELIOS 69 pre amp/EQ (to taste)
2) Radial Direct Box into another HELIOS 60 pre amp/EQ (to taste)
The Radial box has an input and a thru (the thru goes to my AMPEG SVT/CL or a vintage ACOUSTIC 370 head) the output from the DI is an XLR into the HELIOS.
Tricky part is placing the MIC at a distance that does not create a PHASE relationship between the DI and the mic signals. (I know, they have plugs to adjust the phase or I could slide the audio track to eliminate the phase but I do find getting it right at the source is the best remedy in avoiding the issue all together.
Jim