Glockenklang 3-Band EQ 5 Pots - active/passive switch (push/pull volume control), balance control without volume reduction at mid position, active treble control (+/-18dB @ 18kHz), classic passive treble control, bass control (+/-14dB @ 40Hz) and mid control (+/-9dB @ 550Hz), requires 9V battery. Due to the high quality electronics used, there is no audible difference between active and passive use when controls are at mid position. Supplied pre-wired with highly flexible cables.