Owner’s Manual
Thank you, and congratulations on your choice of BOSS CEB-3 Bass Chorus.
Before using this unit, carefully read the sections entitled: “USING THE UNIT SAFELY”
and “IMPORTANT NOTES” (separate sheet). These sections provide important information concerning the proper operation of the unit. Additionally, in order to feel assured
that you have gained a good grasp of every feature provided by your new unit, this manual should be read in its entirety. The manual should be saved and kept on hand as a convenient reference.
A battery is supplied with the unit. The life of this battery may be limited, however,
since its primary purpose was to enable testing.
Copyright © 2001 BOSS CORPORATION
All rights reserved. No part of this publication may be reproduced in any form without
the written permission of BOSS CORPORATION.
● The BOSS CEB-3 is a chorus unit that is specifically designed for electric bass guitar.
● The CEB-3 allows you to select the frequency band to which the chorus effect will apply. That is, you can have the effect applied to the overall sound, or only a specific
frequency range if you wish.
● Using the two channel outputs, deeper chorus effects can be created.
Panel Description
1. AC Adaptor Jack
1 2
Accepts connection of an AC Adaptor (optionally available BOSS PSA-Series). By
using an AC Adaptor, you can play without being concerned about how much battery power you have left.
* Use only the specified AC adaptor (PSASeries), and make sure the line voltage at the
installation matches the input voltage
specified on the AC adaptor's body. Other
AC adaptors may use a different polarity, or
be designed for a different voltage, so their
use could result in damage, malfunction, or
electric shock.
* As soon as you connect the AC adaptor, the
unit is turned on.
* If there is battery in the unit while an AC
adaptor is being used, normal operation will
continue should the line voltage be interrupted
(power blackout or power cord disconnection).
Panel Description
2. CHECK Indicator
This indicator shows whether an effect is
ON/OFF, and also doubles as the Battery
Check indicator.
The indicator lights when an effect is ON.
The output jacks are used to connect the
unit to an amplifier or another effects unit.
* If this indicator goes dim or no longer lights
while an effect is ON, the battery is near
exhaustion and should be replaced immediately. For instructions on changing the
batteries, refer to “Changing the Battery” (p.
* The CHECK indicator shows whether the
effect is being applied or not, and is used to
indicate other effects. It does not indicate
whether the power to the device is on or not.
* For monaural output, use Output jack A.
Both the dry and processed signals are
* For stereo use:
Output A: Only the processed signal (pitch
modulated sound) is output. The
dry (unprocessed) signal is not
Output B: Only the dry signal is output.
The CEB-3 adopts the “space synthesis system” for stereo output. That is, the depth of the
effect varies depending on the distance between speakers. Note that lowering a filter
control knob or effect level too much will shift
the sound image to the Output B position, and
therefore diminish the effect. Experiment with
different as you play the instrument
Panel Description
4. Pedal Switch
6. INPUT Jack
Used for switching effects on/off.
This jack accepts input signals (coming
from a bass guitar, some other musical instrument, or another effects unit).
5. Thumbscrew
When this screw is loosened, the pedal
will open, allowing you to change the battery.
* For instructions on changing the batteries,
refer to “Changing the Battery” (p. 11).
* When running the unit on battery power, the
INPUT jack double as power switches. Power
to the unit is turned on when you plug into
the INPUT jack; the power is turned off when
the cable is unplugged. Be sure to disconnect
any cord plugged into the INPUT jack when
not using this effects device.
Panel Description
This knob controls the lower frequencies
of the effect sound. As you rotate the knob
clockwise, the chorus effect will be applied to a wider range of lower frequencies. Conversely, rotating the knob
counterclockwise will cut lower frequencies, causing only the upper frequencies to
take on the chorus effect.
9. RATE (moduration rate) Knob
7. E. LEVEL (effect level) Knob
This knob adjusts the level of the effect
sound (in relation to the input signal). Rotating the knob clockwise increases the
level of the effect sound.
This knob adjusts the speed of the chorus
effect. Rotating the knob clockwise increases the speed.
10. DEPTH (moduration depth) Knob
This knob adjusts the depth of the chorus
effect. Rotating the knob clockwise deepens the effect.
AC Adaptor
BOSS PSA-series
OUT 9V DC/200mA
Bass Amplifier
For monoural use,
make the connection to
the OUTPUT A (MONO) jack.
* Inserting a plug into the INPUT Jack will automatically switch the unit on.
* Noise may be produced if wireless communications devices, such as cell phones, are operated in the
vicinity of this unit. Such noise could occur when receiving or initiating a call, or while
conversing. Should you experience such problems, you should relocate such wireless devices so they
are at a greater distance from this unit, or switch them off.
* To prevent malfunction and/or damage to speakers or other devices, always turn down the volume,
and turn off the power on all devices before making any connections.
* If there are batteries in the unit while an AC adaptor is being used, normal operation will continue
should the line voltage be interrupted (power blackout or power cord disconnection).
* Once the connections have been completed (p. 8), turn on power to your various devices in the
order specified. By turning on devices in the wrong order, you risk causing malfunction and/or
damage to speakers and other devices.
When powering up:
Turn on the power to your guitar amp last.
When powering down: Turn off the power to your guitar amp first.
* Always make sure to have the volume level turned down before switching on power. Even with the
volume all the way down, you may still hear some sound when the power is switched on, but this is
normal, and does not indicate a malfunction.
* When operating on battery power only, the unit’s indicator will become dim when battery power
gets too low. Replace the battery as soon as possible.
Operating the Unit
1. When you have made the necessary
connections, set the knobs as shown in
the illustration.
2. Depress the pedal switch to turn the
effect on. (Make sure that the CHECK
Indicator lights.)
3. Adjust the speed of the chorus effect
using the RATE Knob.
4. Adjust the depth of the chorus effect
using the DEPTH Knob.
5. Using the LOW FILTER Knob, adjust
the frequency band to which the chorus effect should be applied.
6. Adjust the volume of the processed
sound using the E. LEVEL Knob.
Changing the Battery
When the indicator goes dim or no longer
lights while an effect is on, it means that
the battery is nearly dead and must be replaced. Replace the battery following the
steps below.
Spring Base
Battery Snap
Coil Spring
Guide Bush
Battery Housing
9V Battery
1. Loosen the thumbscrew at the front of
the pedal, then lift the pedal upwards
to open the unit.
* The thumbscrew can be left in the pedal while
changing the battery.
2. Remove the old battery from the battery
housing, and remove the snap cord connected to it.
3. Connect the snap cord to the new battery,
and place the battery inside the battery
* Be sure to carefully observe the battery's
polarity (+ versus –).
4. Slip the coil spring onto the spring base on
the back of the pedal, then close the pedal.
* Carefully avoid getting the snap cord caught
in the coil spring.
5. Finally, insert the thumbscrew into the
guide bush hole and fasten it securely.
Setting Samples
Clear Chorus
Modern Chorus
Slapping Play
CEB-3: Bass Chorus
Nominal Input Level...................-20 dBu
Input Impedance..........................1 MΩ
Nominal Output Level................-20 dBu
Output Impedance ......................1 kΩ
Recommended Load Impedance ....10 kΩ or greater
Residual Noise Level...................-86 dBu (IHF-A, Typ.)
Controls.........................................Pedal Switch
E. LEVEL (effect level) Knob
RATE (modulation rate) Knob
DEPTH (modulation depth) Knob
Indicator........................................CHECK Indicator (serves also as battery check indicator)
Connectors....................................INPUT Jack
AC Adaptor Jack (DC 9 V)
Power Supply...............................DC 9 V: Dry Battery 9 V type (6F22/9 V)
AC Adaptor
Current Draw ...............................22 mA (DC 9 V)
* Expected battery life under continuous use:
Carbon: 12 hours
These figures will vary depending on the actual conditions of use.
Dimensions ...................................73 (W) x 129 (D) x 59 (H) mm
2-7/8 (W) x 5-1/8 (D) x 2-3/8 (H) inches
Weight ...........................................450 g / 1 lb (including battery)
Accessories....................................Owner’s Manual
NOTES,” and “Information”)
Dry Battery 9 V type (6F22/9 V)
Options..........................................AC Adaptor PSA-Series
* 0 dBu = 0.775 Vrms
* In the interest of product improvement, the specifications and/or appearance of this unit are subject
to change without prior notice.
For EU Countries
This product complies with the requirements of European Directive 89/336/EEC.
For the USA
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the
FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential
installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee
that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
– Reorient or relocate the receiving antenna.
– Increase the separation between the equipment and receiver.
– Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
– Consult the dealer or an experienced radio/TV technician for help.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and
(2) This device must accept any interference received, including interference that may cause undesired operation.
Unauthorized changes or modification to this system can void the users authority to operate this equipment.
This equipment requires shielded interface cables in order to meet FCC class B Limit.
For Canada
This Class B digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations.
Cet appareil numérique de la classe B respecte toutes les exigences du Règlement sur le matériel brouilleur du Canada.