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55-01 Passive / Active

Yes, that's right. The standard preamp in the 55-01 has an "EQ-bypass", but it still has to have a charged battery to operate. Dead battery = no sound even with the bypass switch pulled. The Bart NTMB can be set up with a true active/passive switch, and the pre-wired control harnesses usually have that included. If you order the 55-01 with the NTMB from the factory, it will definately have an active-passive switch.

Mike