BOSSCO GEB-7 User manual

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Owner's Manual
DCAC
AC & BATTERY
POWERED
FET

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Thank you, and congratulations on your choice of BOSS GEB-7 Bass Equalizer.
Before using this unit, carefully read the sections entitled: “USING THE UNIT SAFELY”
and“IMPORTANTNOTES”(separatesheet).Thesesectionsprovideimportantinformation
concerningtheproperoperationoftheunit.Additionally,inordertofeelassuredthatyou
havegained agood graspof everyfeature providedby yournew unit,this manualshould
be read in its entirety. The manual should be saved and kept on hand as a convenient
reference.
©1995 BOSS Corporation
All right reserved. No part of this publication may be reproduced in any form without the
written permission of BOSS Corporation.

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FEATURES
• The BOSS GEB-7 is a 7-band equalizer designed specifically for electric bass.
• Since it allows for a broad range of frequency settings, even five string basses can be
accommodated.
• TheunitisdesignedtoprovidetheoptimumQ(equalizer'sbandwidth)forbassforeach
center frequency. While making it easy to obtain the most delicate of nuances, it also
allows for radically unique settings as well.
• The GEB-7 allows you to adjust the output level of the equalized sound so it matches
the level of the input sound.

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PANEL DESCRIPTIONS 1. AC Adaptor Jack
Acceptsconnection ofan ACAdaptor (op-
tionally available BOSS PSA-Series). By
usinganACAdaptor,youcanplaywithout
being concerned about how much battery
power you have left.
* You may find that it is a good idea to keep a
battery installed in the unit even while using
an adaptor. That way your playing won’t be
disrupted even if the adaptor is accidentally
disconnected.-
* If you are going to use an AC adaptor, be sure
to use the specified unit (BOSS PSA-Series).
Use of any other adaptor may result in dam-
age, malfunction or electric shock.
Also, if you are not going to be using it for an
extended period of time, disconnect the AC
adaptor from the AC outlet.
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3
4
5
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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.
Ifthisindicatorgoesdimornolongerlights
while an effect is ON, the battery is near
exhaustion and should be replaced imme-
diately.
3. OUTPUT Jack
The output jacks are used to connect the
unit to amplifiers or other devices.
4. Pedal Switch
This switch turns the effects ON/OFF.
5. Thumbscrew
This thumbscrew is loosened to open the
pedal, allowing battery replacement. For
instructions on how to replace the battery,
please refer to “CHANGING THE BAT-
TERY”.
6. INPUT Jack
This jack accepts input signals (coming
from a bass guitar, some other musical
instrument, or another effects unit).
* The INPUT jack also serves as the power
switch.Poweris turnedonwhenever aplugis
insertedintotheINPUTjack, andisturnedoff
when the plug is disconnected. When not
using the unit, you should disconnect any
cord connected to the INPUT jack.

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Equalizer Control knobs
These knobs allow you to boost or cut the
center frequency of 50, 120, 400, 500,
800, 4.5 k or 10 kHz within +/-15 dB.
Level Control Knob
This knob allows you to adjust the output
level of the effect sound to minimize the
level difference between the effect and
direct sounds.
+15
-
15
0
800 4.5k 10k50040012050 Level
Equalizer Control Knobs
Level Control Knob

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MAKING THE CONNECTIONS
AC Adaptor (PSA-Series ; Optional)
Electric Bass
Amplifier
OUT 9V DC / 200mA

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* Inserting a plug into the INPUT Jack will automatically switch the unit on.
* 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.
* Ifthere arebatteriesintheunitwhileanACadaptorisbeing used,normaloperationwillcontinue
should the line voltage be interrupted (power blackout or power cord disconnection).
* Once the connections have been completed, 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.
* Whenoperatingon batterypoweronly, theunit’sindicator willbecomedim whenbatterypower
gets too low. Replace the battery as soon as possible.
* The CHECK indicator shows whether the effect is being applied or not. It does not indicate
whether the power to the device is on or not.

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OPERATING THE UNIT
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31. 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. AdjustthetoneusingtherelevantEqual-
izer Control Knobs.
4. Adjust the output level using the Level
Control Knob, to minimize the level
differencebetweentheeffectanddirect
sounds.

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Thumbscrew
Pedal
Spring Base
Coil Spring
Guide
Bush
Hole
Battery
Housing
Battery Snap Cord
Battery Snap
9V Battery
CHANGING THE BATTERY
Whenthe 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.
1. Loosen the thumbscrew at the front of the
pedal,thenliftthepedalupwardstoopenthe
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 con-
nected to it.
3.Connectthesnapcordtothenewbattery,and
place the battery inside the battery housing.
* Be sure to carefully observe the battery+s
polarity (+ versus -).
4.Slipthecoilspringontothespringbaseonthe
back of the pedal, then close the pedal.
*Carefullyavoidgettingthesnapcordcaught
in the coil spring.
5.Finally, insert the thumbscrew into the guide
bush hole and fasten it securely.

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FREQUENCY RESPONSE
100 1k 10k
FREQUENCY(Hz)
-15
0
+15
LEVEL(dB)
10

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SAMPLE SETTING
Standard Rock Heavy Metal
Slapping Play Bass Amplifier Simulation
+15
-
15
0
800 4.5k 10k50040012050 Level
+15
-
15
0
800 4.5k 10k50040012050 Level
+15
-
15
0
800 4.5k 10k50040012050 Level
+15
-
15
0
800 4.5k 10k50040012050 Level

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SETTING MEMO
+15
-
15
0
800 4.5k 10k50040012050 Level
+15
-
15
0
800 4.5k 10k50040012050 Level
+15
-
15
0
800 4.5k 10k50040012050 Level
+15
-
15
0
800 4.5k 10k50040012050 Level

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SPECIFICATIONS
GEB-7 : Bass Equalizer
Nominal Input Level ................. -20 dBu
Input Impedance ...................... 1 MΩ
Nominal Output Level .............. -20 dBu
Output Impedance ................... 1 kΩ
Recommended Load Impedance.. 10 kΩor greater
Residual Noise Level................. -100 dBu (IHF-A, Typ.)
Variable Range ......................... Equalizer Control : +/-15 dB
Level Control : +/-15 dB
Controls.................................... Pedal Switch
Equalizer Control Knobs (50, 120, 400, 500, 800, 4.5 k, 10 kHz)
Level Control Knob
Indicator................................... CHECK Indicator (serves also as battery check indicator)
Connectors ............................... INPUT Jack
OUTPUT Jack
AC Adaptor Jack (DC 9 V)
Power Supply ........................... DC 9 V: Dry Battery 9 V type (6F22/9 V), AC Adaptor
Current Draw ........................... 16 mA (DC 9 V)
* Expected battery life under continuous use :
Carbon : 12 hours
Thesefigureswillvarydependingontheactualconditionsofuse.

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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...................................... 440 g / 1 lb (including battery)
Accessories ............................... Owner’s Manual
Dry Battery 9 V type (6F22/9 V)
Leaflet (“USINGTHEUNITSAFELY,”“IMPORTANTNOTES,”and“Information”)
Options .................................... AC Adaptor PSA-Series
* 0 dBu = 0.775 V rms
* In the interest of product development, the specifications and/or appearance of this unit are
subject to change without prior notice.
This product complies with the requirements of
European Directive 89/336/EEC.
For EU Countries

16 2601720402