Flats with a couple of "15s push by a Dual Showman, you'll be fine
I've tried playing an EB-2, with and without flats, through a staggering range of (mostly Ampeg) gear. Amazingly, though nearly all other basses sounded great, the EB-2 didn't.
So either the Dual Showman (generally regarded as a good guitar amp/bad bass amp) is the magic bullet here, or we have different ideas on what "fine" means.