EMG BQC System HZ Bass Preamp

4 Knob Layout 3 BAND BASS PREAMP COMPATIBLE WITH MOST PASSIVE PICKUPS ON THE MARKET VARIABLE FREQUENCY KNOB ALLOWS YOU TO DIAL IN YOUR TONE. ADJUSTABLE FROM 100Hz TO 1KHz COMPATIBLE WITH 9 OR 18 VOLTS FREE SHIPPING IN THE USA EXPERT TECHNICAL SUPPORT IN STOCK MEANS IN STOCK ---> DESCRIPTION & TECH The BQC System HZ is a complete control system for bass guitars using passive pickups or EMG HZ pickups. Active Balance, Master Volume and EQ circuits are included. The EQs allow you separate control over bass, midrange, and treble all via 2 concentric/stacked pots. Rotate 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. All knobs included. Layout:3 Band -- 4 Knob:Volume -- Balance -- Treble/Bass Stack -- Mid Range Control BQC System