BOSSCO LMB-3 Manuel utilisateur

Owner's Manual

DCAC

AC & BATTERY

POWERED

FET

Thank you, and congratulations on your choice of BOSS LMB-3 Bass Limiter Enhancer.

Toensureproperoperation,andyearsoftrouble-freeservice,pleasetakethetimetoread

through this Owner’s Manual before starting out.

FEATURES

• The BOSS LMB-3 is a limiter/enhancer specifically designed for electric bass.

• The LMB-3 allows you to create a well-balanced sound by controlling the volume

difference of the sound or to avoid sound distortion.

• By adjusting the THRESHOLD level and RATIO knobs, the intensity of the limiter can

be spontaneously controlled.

• Using the Enhance effect, you can make the sound clearer and sharper.

written permission of BOSS Corporation.

IMPORTANT NOTES

When using an AC adaptor, use only the specified device (PSA Series). Use of any other

AC adaptor could result in damage, malfunction or electric shock.

ADDITIONAL PRECAUTIONS

Protect the unit from strong impact.

Should a malfunction occur, or if you sus-

pect there is a problem, discontinue use

immediately. Contact qualified service

personnel as soon as possible.

To avoid the risk of electric shock, do not

open the unit.

CHANGING BATTERY

Removethebatterywhenevertheunitisto

remain unused for an extended period of

time.

POWER SUPPLY

The power requirement for this unit is

indicated on its nameplate (rear panel).

Ensure that the voltage in your installation

meets this requirement.

If the unit is to remain unused for an ex-

tended period of time, unplug the power

cord.

PLACEMENT

Do not subject the unit to temperature

extremes (eg., direct sunlight in an en-

closed vehicle). Avoid using or storing the

unit in dusty or humid areas, or areas that

are subject to high levels of vibration.

PANEL DESCRIPTIONS 1. AC Adaptor Jack

Acceptsconnection of anAC Adaptor (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.

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.Power isturned onwhenever aplug is

insertedintotheINPUTJack,andisturnedoff

when the plug is disconnected. When not

using the unit, you should disconnect any

cord connected to the INPUT Jack.

ENHANCE Knob

This knob adjusts the intensity of the enhance

effectthatmakesthesound clearer and sharper.

Rotating the knob clockwise emphasizes the

effect.

RATIO Knob

This knob controls the compression ratio of the

limiter. That is, it adjusts how much the limiter

shouldcompressthosesignalsabovethethresh-

old level.

*Whenitissetto“1:1”,nolimitereffectwillbe

obtained.

THRESHOLD Knob

This knob controls the threshold level (the level

at which the compression effect will kick in).

Rotating the knob counterclockwise lowers the

threshold level.

For a detailed explanation about the Ratio and

Threshold Level, see “ABOUT THE LIMITER'S

ACTION”.

LEVEL Knob

This knob adjusts the level of the effect sounds.

Set the knob so there is no volume difference

between the effect and straight guitar sounds.

* If this knob is rotated completely counter-

clockwise, no sound will be heard.

CHECK

ENHANCE

LEVEL

MIN MAX 1:1

∞

RATIO THSHD

MIN MAXMIN MAX

LEVEL Knob

ENHANCE Knob

THRESHOLD Knob

RATIO Knob

AC Adaptor (PSA-Series ; Optional)

Electric Bass

Amplifier

OUT 9V DC / 200mA

MAKING THE CONNECTIONS

* Inserting a plug into the Input Jack will automatically switch the unit on.

*Beforeconnectingordisconnectinganypatchcords,besureallthevolumecontrolsinyoursystem

are set to minimum. This will help prevent any damage to system components.

CHECK

ENHANCE

LEVEL

MIN MAX 1:1∞:1

RATIO THSHD

MIN MAXMIN MAX

OPERATING THE UNIT

1.Whenyouhavemadethenecessaryconnections,setthe

knobs as shown in the illustration.

2.Depressthepedalswitchtoturntheeffecton.(Makesure

that the CHECK Indicator lights.)

3. Adjust the Threshold Level (the level at which compres-

sion starts) using the THRESHOLD Knob.

4. Adjust the compression ratio using the RATIO Knob.

5. Adjust the intensity of the enhance effect using the

ENHANCE Knob.

6. Adjust the LEVEL Knob so there will be no volume

difference between the effect and straight bass sounds.

CHECK

ENHANCE

LEVEL

MIN MAX 1:1∞:1

RATIO THSHD

MIN MAXMIN MAX

6543

ABOUT THE LIMITER'S ACTION

The LMB-3’s limiter will function differently depending upon how you set the Ratio and

Threshold Levels. The RATIO and THRESHOLD knobs work as described below.

RATIO : The compression ratio for the input signal is called Ratio. For instance,

when the Ratio is set to “2:1”, an input signal that is 6 dB louder than the

Threshold Level will be compressed to one half, or 3 dB When it is set to

“∞:1”, any input signal above the Threshold Level will be compressed to

the Threshold Level, then output.

THRESHOLD : The Threshold Level is the level at which compression starts to work.

Whenthe input signalhas reached theThreshold Level, thesignal will be

compressed at the compression ratio set with “RATIO”, then output.

When the input signal is lower than the Threshold Level, it will be output

without compression.

The following figure shows how the output signal is affected by the settings of the RATIO

and THRESHOLD knobs.

Threshold Level

Ratio = a : b

Input Level (dBm)

Output Level (dBm)

1:1

2:1

∞

Threshold Level

Input Level (dBm)

Output Level (dBm)

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