User manual ROLAND LMB-3 MANUAL 2

[. . . ] Contact qualified service personnel as soon as possible. To avoid the risk of electric shock, do not open the unit. PLACEMENT Do not subject the unit to temperature extremes (eg. , direct sunlight in an enclosed vehicle). Avoid using or storing the unit in dusty or humid areas, or areas that are subject to high levels of vibration. CHANGING BATTERY Remove the battery whenever the unit is to remain unused for an extended period of time. 3 PANEL DESCRIPTIONS 1 2 1. AC Adaptor Jack Accepts connection of an AC Adaptor (optionally available BOSS PSA-Series). [. . . ] 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 LEVEL Knob ENHANCE Knob CHECK LEVEL LMB-3 LMB-3 LMB-3 LMB-3 ENHANCE Knob This knob adjusts the intensity of the enhance effect that makes the sound clearer and sharper. Rotating the knob clockwise emphasizes the effect. THSHD LMB-3 LMB-3 ENHANCE RATIO RATIO Knob This knob controls the compression ratio of the limiter. That is, it adjusts how much the limiter should compress those signals above the threshold level. MIN MAX 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. 6 * If this knob is rotated completely counterclockwise, no sound will be heard. LMB-3 LMB-3 * When it is set to "1:1", no limiter effect will be 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". 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. 7 OPERATING THE UNIT 1. When you have made the necessary connections, set the knobs as shown in the illustration. LEVEL LMB-3 LMB-3 LMB-3 LMB-3 LMB-3 CHECK ENHANCE RATIO THSHD LMB-3 LMB-3 LMB-3 2. Depress the pedal switch to turn the effect on. (Make sure that the CHECK Indicator lights. ) MIN MAX MIN MAX 1:1 :1 MIN MAX 3. Adjust the Threshold Level (the level at which compression starts) using the THRESHOLD Knob. CHECK LEVEL LMB-3 4. Adjust the compression ratio using the RATIO Knob. Adjust the intensity of the enhance effect using the ENHANCE Knob. ENHANCE RATIO THSHD LMB-3 MIN MAX MIN MAX 1:1 :1 MIN MAX 6. Adjust the LEVEL Knob so there will be no volume difference between the effect and straight bass sounds. 8 LMB-3 6 LMB-3 5 4 3 LMB-3 LMB-3 LMB-3 LMB-3 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. When the input signal has reached the Threshold Level, the signal 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. 9 The following figure shows how the output signal is affected by the settings of the RATIO and THRESHOLD knobs. Output Level (dBm) Output Level (dBm) 1:1 2:1 Threshold Level b Threshold Level a Ratio = a : b :1 Input Level (dBm) Input Level (dBm) 10 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. [. . . ] Pedal Switch, LEVEL Knob, ENHANCE Knob, RATIO Knob, THRESHOLD Knob Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CHECK Indicator (serves also as battery check indicator) Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . INPUT Jack, OUTPUT Jack, AC Adaptor Jack (9 V DC) Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 V DC : Dry Battery 9 V type (6F22/9 V), AC Adaptor Current Draw . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ]