batsbrew
if you do not already have a DI, i'd say that's one of those devices every studio of any level should have.
that said,
always capture a DI when you do a MIC, you can use both, or either,
but if there is ever a problem with the mic track, having the DI can be a god send.
well said,plus you have the sound of the cab as well as the amp to mix down.
I use a SansAmp Bass D.I. which has some very sweet modelling options.
also had some success with a Beta 52A and an E604 taped together.
ps:thanks for the reminder on mic placement, Codamedia,i tend to set and forget.
cheers