The Glockenklang 3-band onboard preamp is active/passive switchable (at the volume push/pull), has a balance pot with no volume dip in center position, a treble pot with +/- 18 dB@18 kHz in active mode, acting as classic high cut in passive mode, mid pot +/- 9 dB@550 Hz, and a bass pot with +/- 14 dB@40 Hz. Battery connection is @ 9 volts.
Due to the high performance electronics, in flat position of the EQ you can hear no difference between active and passive mode. Comes pre-wired with high-flex cables.