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 classical highcut 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 electronic components, in flat position of the eq you can hear no difference between active and passive mode ! 
It comes pre-wired with high-flexible cables.

Don´t mind the frequencies, Glockenklang chooses them very carefully !