I've very recently acquired a DPA 4061, but I'm using it on a nyckelharpa rather than a bass. Only tried it out at home so far, and it sounds very good. I got because it was highly recommended by Vicki Swan, who uses one for live work (also on nyckelharpa) and says it's brilliant, though I don't think she's using it in a large band. I'm using it with a Headway EDB2 preamp. I'd be interested in hearing others' experiences with these - do's and don'ts etc.
EDIT: to add that the EDB2 has a sweepable notch filter with adjustable width, and also a phase-reversal switch, either or both of which may help with feedback issues - but as I say I haven't used it in a live situation so can't comment on how effective it would be.