A great electronics circuit to install in any guitar or bass with EMG pickups (and EMG pickups only!) a BQS System. The BQS has a pre-wired balance control, master volume, and separate bass and treble controls with a concentric mid control. All the EQ controls and balance control feature center detents. This active EQ circuit for bass guitars works by rotating the control clockwise to boost, counterclockwise to cut. There is a center detent for flat response. The mid-range control has a variable frequency knob that allows you to sweep through the mid-frequency range from 100Hz to 1KHz. This selects the frequency to boost or cut.
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