Owner's Manual AC DC AC & BATTERY POWERED FET 1
Thank you, and congratulations on your choice of BOSS LMB-3 Bass Limiter Enhancer. To ensure proper operation, and years of trouble-free service, please take the time to read 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.
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. POWER SUPPLY ADDITIONAL PRECAUTIONS The power requirement for this unit is indicated on its nameplate (rear panel). Ensure that the voltage in your installation meets this requirement. Protect the unit from strong impact. If the unit is to remain unused for an extended period of time, unplug the power cord.
PANEL DESCRIPTIONS 1. AC Adaptor Jack 1 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. 2 3 4 5 4 6 * 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.
2. CHECK Indicator 5. Thumbscrew 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. If this indicator goes dim or no longer lights while an effect is ON, the battery is near exhaustion and should be replaced immediately. This thumbscrew is loosened to open the pedal, allowing battery replacement. For instructions on how to replace the battery, please refer to “CHANGING THE BATTERY”. 3.
ENHANCE Knob LEVEL Knob This knob adjusts the intensity of the enhance effect that makes the sound clearer and sharper. Rotating the knob clockwise emphasizes the effect. ENHANCE Knob CHECK LEVEL ENHANCE RATIO THSHD LMB-3 LMB-3 MIN MAX LMB-3 LMB-3 LMB-3 LMB-3 LMB-3 LMB-3 MIN MAX 1:1 ∞:1 MIN MAX RATIO Knob THRESHOLD Knob 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.
MAKING THE CONNECTIONS AC Adaptor (PSA-Series ; Optional) OUT 9V DC / 200mA Electric Bass Amplifier * Inserting a plug into the Input Jack will automatically switch the unit on. * Before connecting or disconnecting any patch cords, be sure all the volume controls in your system are set to minimum. This will help prevent any damage to system components.
OPERATING THE UNIT 1. When you have made the necessary connections, set the knobs as shown in the illustration. CHECK LEVEL ENHANCE RATIO THSHD LMB-3 LMB-3 LMB-3 that the CHECK Indicator lights.) LMB-3 2. Depress the pedal switch to turn the effect on. (Make sure LMB-3 LMB-3 LMB-3 LMB-3 1:1 ∞:1 MIN MAX MIN MAX MIN MAX LEVEL ENHANCE RATIO THSHD 5 4 3 3. Adjust the Threshold Level (the level at which compression starts) using the THRESHOLD Knob. 4.
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.
b Threshold Level a Ratio = a : b Input Level (dBm) 10 Output Level (dBm) Output Level (dBm) The following figure shows how the output signal is affected by the settings of the RATIO and THRESHOLD knobs.
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. 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. Thumbscrew Pedal Spring Base 2. Remove the old battery from the battery housing, and remove the snap cord connected to it. 3.
SAMPLE SETTING Enhancer Limiter CHECK THSHD LEVEL LMB-3 LMB-3 LMB-3 LMB-3 MIN MAX MIN MAX LMB-3 Finger Picking THSHD LEVEL LMB-3 LMB-3 THSHD LMB-3 LMB-3 LMB-3 LMB-3 ∞:1 RATIO LMB-3 LMB-3 LMB-3 MIN MAX MIN MAX MIN MAX LMB-3 1:1 ENHANCE LMB-3 MIN MAX LMB-3 LMB-3 12 ∞:1 CHECK RATIO LMB-3 ENHANCE LMB-3 MIN MAX 1:1 Slapping Play CHECK LEVEL MIN MAX LMB-3 LMB-3 LMB-3 LMB-3 ∞:1 THSHD LMB-3 1:1 RATIO LMB-3 MIN MAX LMB-3 LMB-3 MIN MAX ENHANCE LMB-3 RATIO LM
SETTING MEMO CHECK THSHD LEVEL LMB-3 LMB-3 MIN MAX THSHD LEVEL ENHANCE LMB-3 LMB-3 MIN MAX LMB-3 LMB-3 LMB-3 RATIO THSHD LMB-3 LMB-3 LMB-3 MIN MAX MIN MAX LMB-3 LMB-3 ∞:1 LMB-3 LMB-3 ∞:1 LMB-3 LMB-3 1:1 1:1 CHECK RATIO LMB-3 MIN MAX LMB-3 MIN MAX LMB-3 LMB-3 LMB-3 LMB-3 MIN MAX CHECK MIN MAX THSHD LMB-3 LMB-3 ENHANCE ∞:1 RATIO LMB-3 LEVEL 1:1 ENHANCE LMB-3 MIN MAX LMB-3 LMB-3 MIN MAX LMB-3 RATIO LMB-3 ENHANCE LMB-3 LMB-3 LEVEL CHECK MIN MAX 1:
SPECIFICATIONS LMB-3 : Bass Limiter Enhancer Nominal Input Level ................. -20 dBm Input Impedance ...................... 1 MΩ Nominal Output Level .............. -20 dBm Output Impedance ................... 1 kΩ Recommended Load Impedance 10 kΩ or greater Residual Noise Level ................. -86 dBm (IHF-A, Typ.) Controls .................................... Pedal Switch, LEVEL Knob, ENHANCE Knob, RATIO Knob, THRESHOLD Knob Indicator ...................................
Dimensions ............................... 70 (W) x 125 (D) x 55 (H) mm 2-3/4 (W) x 4-15/16 (D) x 2-3/16 (H) inches Weight ...................................... 430 g / 15 oz (including battery) Accessories ............................... Owner’s Manual, Dry Battery 9 V type (6F22/9 V), Roland Service Options .................................... AC Adaptor PSA-Series * 0 dBm = 0.
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