EMG BQC CONTROL Installation Information

PO BOX 4394
SANTA ROSA, CA
95402 USA

0230-0203K

P [phone]
F [phone]
EMGPICKUPS.COM

INSTALLATION INFORMATION
EMG MODEL: BQC CONTROL

(ACTIVE / PASSIVE PICKUP INPUT)

BASS/TREBLE
CONTROL

MID-RANGE
CONTROL

SPECIFICATIONS

Input Impedance (Ohms) 1 MegOhm
Gain/Attenuation/ Frequency Bass Control +/-12db/20Hz
Gain/Attenuation/ Frequency Treble Control +/-12db/(Adjustable)
Input Referred Noise -120dbV
Output Impedance (Ohms) 2K
Recommended Supply Voltage 18 Volts
Current @ 9V/18V (Microamps) 600/740

INCLUDED:

1 BQC Control
3 Knobs
1 Battery Clip with Buss Connector
1 Stereo Output Jack (Battery Switching)
4 Interconnect Cables (2 Red, 2 White)

Battery Life (Hours) 750
Maximum Supply (Volts DC) 27 Volts

General Operation

The BQC System is an active EQ circuit for bass guitars. Their effects are illustrated in the graphs on the next page. They allow you separate
control over bass, midrange, and treble. Rotate the controlled clockwise to boost, counterclockwise to cut. There is a center detent for flat
response. Active or Passive pickups can be used with the BQC and BQSrH Controls.
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.

Battery Power:

If you play the instrument very hard, and are boosting the bass or treble with the BQC, you should consider operating the instrument on +18
Volts (See “Power Tips” under Accessories/product data sheets at http://www.emgpickups.com). If you play mildly and use a minimum of boost
the instrument should operate easily on a single 9-Volt battery. Use an Alkaline or Lithium battery for the best battery life and always unplug
your guitar when you’re not using it.

Dimensions:
BQC (Mid/Bass/Treble)
Equalizer

2.200
(55.8)

2.700
(68.5)

6mm

D Shaft

8mm
P .75

9mm

P .075

1.00
(25)

.880
(22.4)

Warranty

All EMG Pickups and accessories are warranted for a period of two years. This warranty does not cover failure due to improper installation, abuse or damage. If
upon examination the pickup is determined to be defective, a replacement will be made. Warranty replacement products are covered by this same warranty. This
warranty covers only those pickups and accessories sold by authorized EMG Dealers. This warranty is not transferable.

© 2011 Copyright EMG INC. All Rights Reserved.

Installation Instructions:
EMG Model: BQC Control

High Frequency (Treble) Response Selection:

The BQC has the added feature of allowing you to choose from 4 different
high frequency response curves. This is a nice feature especially if you are
using the BQC with passive pickups. The following diagrams show the dip-switch
positions and the graphs show the resultant frequency response.
The BQC Control is an equalizer style control, offering both boost and cut
at the same frequency locations. The control also features a center detent
(click) that lets you know when no equalization is in effect.

ON/ON

BASS/TREBLE
CONTROL

TREBLE BOOST OR CUT (UPPER CONTROL)

BASS BOOST OR CUT (LOWER CONTROL)

OFF/ON

BQC CONTROL (TREBLE RESPONSE: ON/ON)

10 dB/div

20Hz

OFF/OFF

BQC CONTROL (TREBLE RESPONSE: 1 OFF/2 OFF)

10 dB/div

20Hz

Low Frequency (Bass) Response:

The BQC has a fairly standard bass response boost and cut. It’s slope is
6dB per octave and is centered at 50Hz. As you can see in the graph
on the left the signal can be boosted by +12db (Red Line) or cut by

-12dB (Green Line). A center detent (click) is provided on the control
to let you know when the frequency response is flat or unaffected
by boosting or cutting.

BQC CONTROL (TREBLE RESPONSE: 1 OFF/2 ON)

10 dB/div

10KHz1KHz

ON/OFF

BQC CONTROL (TREBLE RESPONSE: 1 ON/2 OFF)

10 dB/div

10KHz1KHz

20Hz

BQC CONTROL BASS RESPONSE

10 dB/div

10KHz1KHz20Hz

10KHz1KHz

MID BOOST OR CUT (UPPER CONTROL)

MID FREQUENCY SELECTION (LOWER CONTROL)

BQC Control Page 2

20Hz

10KHz1KHz

Mid-Range Frequency Response:

One of the primary features of the BQC is it’s mid-range control. It allows you to
choose the frequency you want to boost or cut from 100 to 1000 Hz. The concentric
mid-range pot has two sections. The lower control chooses the frequency, while the
upper control lets you choose the amount of boost or cut you want. The maximum slope
is 12dB per octave at full gain or cut.. There is also a center detent (click) in the center
of the upper control to let you know when the control is not having any effect.

VARIABLE MID-RANGE FREQUENCY

1.0KHz100Hz

10 dB/div

20Hz

10KHz1KHz