EMG BQC System Active Bass Preamp System

Upgrade to a high-quality active preamp and EQ that fits into any bass with the BQC System. EMG includes everything needed for a hassle-free installation.

The EMG BQC System is a complete control system for bass guitars. Active Balance, Master Volume and EQ circuits are included. The EQ effects are illustrated in the graphs on the next page. They allow you separate control over bass, midrange, and treble. Rotate the controls 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. The graphs on page 2 depict the frequency response of the controls.

Included in the EMG BQC System

- Active Balance
- Master Volume
- EQ circuits
- Wiring Harness
- Knobs

Active Balance Control (B118)

The ABC Control is designed for EMG Active Pickups. It allows loss-free balance between two pickups and has a center detent for the middle position. If you are using EMG-HZ Passive pickups, or other passive pickups you will want to use the B125 Active Balance Control which features buffered inputs for passive high impedance pickups.

BQC Control 3-band equalizer for Bass guitar

The BQC features dual-pole filters for broadband equalization. The primary feature of the BQC System is the variable mid-range frequency selection from 100 to 1KHz along with boost or cut of the chosen frequency. An additional feature of the BQC Control is a 2-position dip-switch that controls the slope of the high frequency response. By choosing one of the read more four combinations the high frequency response can be tailored to your liking.

Also included in the package
- Master Volume control, output jack, battery buss and clip.
WARNING: Cancer and Reproductive Harm - www.p65Warnings.ca.gov.
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Dimensions and Weight in Packaging
Base Item
Shipping Weight: 0.5 lbs
Shipping Dimensions: 5 x 4 x 3 in
Manufacturer Part Number (MPN): 875.00

For support or warranty questions, please contact the manufacturer:
Phone: 707-525-9941

Reviewers gave this product an overall rating of 5 out of 5 stars. (2 ratings)
Submitted March 18, 2020 by Timothy C in Saint Paul, MN

"Killer preamp"

Overall: 5 out of 5 stars
(see rating details)
Verified Customer zZounds has verified that this reviewer made a purchase from us.
I have put this preamp in two of my basses now and I absolutely love it. Super easy to install with no issues!!! This preamp has several cool features I love. For me the best part is being able to select the exact mid frequency you want to boost or cut. It’s also super cool that there are four different curves you can choose from on the treble boost/cut. All these features make for a very versatile preamp you can use to dial in any sound you want right on your bass.In response to the other review on here I don’t know what that guys problem was. When you install the knobs you just have to make sure you leave a little space between the knobs and the nut below them. All you have to do is just lift up slightly on the knob while you tighten the set screw.

Musical Background:

Semi pro player for 25 years

Musical Style:

Rock, Metal, Punk, Blues, Jazz, Christian contemporary, Gospel
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