The EMG BQC Control is an active bass, mid, and treble EQ on two concentric, stacked potentiometers. It requires very little space and works with any pickup, whether active or passive. Bass, mid, and treble can be boosted or cut by up to 12 dB. The stacked mid pot allows for continuous adjustment of the mids from 100 Hz to 1 kHz, as well as volume control. All pots have a detent in the center position (not for mid frequency). The circuit board features two small dip switches that enable four different settings for treble response. This EQ operates with very low noise and boasts low power consumption (9V battery). The package includes two additional pot knobs for any existing volume pots. In the box: 1 BQC Control, 2 knobs, 1 battery clip with bus connector, 1 stereo output jack (battery switching), 4 interconnect cables (2 red, 2 white).