Page 1
PO BOX 4394
SANTA ROSA, CA
95402 USA
0230-0203K
P (707) 525-9941
F (707) 575-7046
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.
Page 2
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
Page 3
The BQC Control is easily installed by using the connector cables supplied.
Diagram #1 shows the cables connected to the BQC Control. This 5-pin
layout is the same for all EMG Accessories, so they can be interchanged.
There are a variety of ways instruments can be wired. The examples shown
here are only a few. If your instrument has different wiring than shown here
go to our website: http://www.emgpickups.com for alternate diagrams.
Diagram #2 below shows the installation of a single Volume control along with
the BQC Control.
BATTERY
Diagram #2
BUSS
Master Volume
BQC Control
Diagram #1
NOTE:
REVERSED INPUT
CONNECTOR
- 9V +
VOLUME
B122rH
VOLUME
NOTE:
REVERSED
CONNECTOR
BQC
CONTROL
OUTPUT CABLE
Installation Instructions:
EMG Model: BQC Control
2 Pickups, 2 Volume controls, BQC Control, no selection switch
J-Bass Style wiring
Refer to Diagram #3
1) Install the Pickups and route the Pickup cables to the control cavity.
If the cables are too long, keep any excess under the pickup.
2) Mount the Volume and Tone controls into the body / pickguard.
Plug the Neck Pickup Cable onto the Neck Volume control.
Plug the Bridge Pickup Cable onto the Bridge Volume control.
3) Plug a coax cable from the Neck Volume control to the Bridge Volume
control.
4) Plug a coax cable from the Bridge Volume control to the BQC Control.
R
S
T
OUTPUT
RED TO 9V + BUSS
OUTPUT TO JACK
INPUT
BASS/TREBLE
CONTROL
5) Plug the output cable from the BQC Control and connect the output
wires to the output jack by pushing the connectors on as shown.
WHITE wire onto the TIP (T) contact,
BLACK wire onto the SLEEVE (S) contact
BLACK Battery Negative wire onto the RING (R) contact.
6) Plug the RED Wires of the pickups onto the V+ Supply Buss (RED Shroud)
along with the RED of the battery clip.
Extra pins on the V+ Supply Buss are for EMG Accessories.
7) Put the battery in the insulating foam piece provided and place it securely
in the control cavity.
We suggest that you plug in the instrument and test it before closing the
control cavity.
Diagram #3
Volume / Volume
BQC Control
BRIDGE PICKUP
NECK PICKUP
BQC Control Page 3
- 9V +
NK VOLUME
B122rH
NK VOLUME
VOLUME
BR VOLUME
B122rH
VOLUME
BATTERY
BUSS
OUTPUT CABLE
BASS/TREBLE
CONTROL
NOTE:
REVERSED
CONNECTOR
BQC
CONTROL
BASS
OUTPUT
R
S
T
Page 4
Installation (Two Pickup Guitars with Selection switch):
Guitars with two pickups and a selection switch will use the EMG B245 Pickup Buss
shown at the right in Diagram #4a.
The Pickup Buss is a convenient way to wire your guitar without soldering.
There is a separate sheet attached to these instructions that describes the
Pickup Buss in detail.
In all installations it’s best to find a place to mount the Pickup Buss in the control
cavity before starting. Then, after the cables are routed use the velcro to mount it
securely.
Diagram #4a
BRIDGE PICKUP INPUT
NECK PICKUP INPUT
OUTPUT
PLUG IN
LIKE THIS!
2 Pickups / Toggle Select Switch / Master Volume and BQC Control
1) Install the Pickups and route the Pickup cables to the control cavity.
If the cables are too long, wind up the excess and keep it under the pickup.
2) Mount the Volume and Tone controls into the body.
Plug both Pickup cables into the Pickup Buss (BLACK Shroud) as shown,
Refer to Diagram #4a
Bridge Pickup to Position 1
Neck Pickup to Position 2.
3) Plug a coax cable from the Pickup Buss (Position 3) to the Master Tone (Active)
as shown in Diagram #4b. Note the reversed connector on pins 1 and 2.
4) Plug a coax cable from the Master Tone (ACTIVE) to the Master Volume as shown.
5) Strip the insulation from the switch wires and Insert them into the GREEN
Terminal Block and tighten the screws with a small screwdriver.
The Bridge pickup goes to the BR Terminal
The Neck pickup goes to the NK Terminal
The Output of the switch goes to the O Terminal
If there is a ground wire coming from the switch, insert it into one of the black
terminals on the terminal block.
Diagram #4b
2 Pickups
Toggle Style Select Switch
Master Volume & Master Tone
- 9V +
BATTERY
NEG (-)
GROUND
NECK P/U
OUTPUT
BRIDGE P/U
BRIDGE PICKUP
BQC
OUTPUT
NOTE:
REVERSED
CONNECTOR
NECK PICKUP
6) Plug the output cable onto the Master Volume control and connect the output
wires to the output jack and push the connectors onto the jack as shown.
WHITE wire onto the TIP (T) contact,
BLACK wire onto the SLEEVE (S) contact
BLACK Battery Negative wire onto the RING (R) contact.
7) Plug the RED Wires of the pickups onto the V+ Supply Buss (RED Shroud)
along with the RED of the battery clip, and the RED wire of the Active Tone Control.
Extra pins on the V+ Supply Buss are for EMG Accessories.
8) Put the battery in the insulating foam piece provided and place it securely in the
control cavity.
We suggest that you plug in the instrument and test it before closing the
control cavity.
BASS/TREBLE
CONTROL
CONTROL
RED
RED
RED
OUTPUT
R
S
Diagram #5
ABC / Master Volume
BQC Control
Output Jack
EMG Active Neck Pickup
(Upper 3 pin header)
EMG Active Bridge Pickup
(Lower 3 pin header)
RED WIRES
FROM PICKUPS
FROM NECK PICKUP
FROM BRIDGE PICKUP
- 9V +
B118
ACTIVE BALANCE
CONTROL
RED
RED
RED
NOTE:
REVERSED
CONNECTOR
9V+ POWER BUSS
BQC
CONTROL
MASTER
VOLUME
B122rH
VOLUME
BATTERY
NEG (-) BLACK
MASTER
VOLUME
B122rH
VOLUME
OUTPUT CABLE
OUTPUT CABLE
S
OUTPUT
R
T
T
BOTTOM
VIEW
BQC Control Page 4
BASS/TREBLE
CONTROL
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