The DI-1000 can operate as either a passive impedance matching device via the Jensen JT-DB-EP transformer, or as an active DI where the Sonic Maximizer circuit can be engaged with the signal still balanced at its output by the Jensen transformer.
"Both DIs [DI-1000 & DI-100x] sounded sweet, clear, airy and squeaky clean. The BBE's real strength is providing uncolored sound ... When I turned off the Maximizer, I just wanted it back on again - it's kind of addictive. [The BBE DIs offer] a quality DI with the added weapon of the Sonic Maximizer - an option you won't find on any other direct box..."