User manual GALLIEN-KRUEGER MB2 500

[. . . ] MB2 500 OWNER'S MANUAL MB² SERIES Congratulations!Your purchase of a new Gallien-Krueger MB² Series amplifier is surely the result of much careful consideration on your part. For our part, we at Gallien-Krueger are pleased that you chose us, and are determined that you will be a satisfied customer. In choosing a MB² Series amplifier, you now own an amplifier with many unique features which will allow you to create your own distinct sound. [. . . ] -10 dB Pad/Clip indicator: Input attenuator button. This button is generally set to the out position except in cases where the clip LED flashes more than occasionally. It may be necessary to "pad" the input if you are using a bass with active electronics or very high output. The pad button light flashes red when the input is being overdriven. If the -10dB is pressed and the clip indicator still flashes frequently, reduce the volume on your bass. Mute: Set this switch to "on" when tuning or unplugging your bass. No signal will be sent to the speakers or the P. A. Gain: Sets the preamp gain after the input stage. It is used in conjunction with the input pad to optimize the amplifier's headroom. Contour: As part of the amps active equalization the contour control decreases the mid-range frequencies while boosting low and high frequencies. Treble: Boost and cut at 7 kHz +14 dB shelving type. Use this control to add or remove edge and definition. A "Q Optimized, " band pass type, this works on lower string harmonics and effects the punch of your sound. Low-Mid: Boost and cut at 250Hz +6dB/-10 dB. A "Q optimized" band pass type, this works for main body of your sound. Bass: Boost and cut a 60Hz +10 dB, shelving type. This is used to control the low end push. technology which adds "growl" as it is turned up. GIVE: This button activates the Boost and Master B volume control. . This can also be activated using the foot switch (included). Master B: This is the master volume control when boost is activated. Master: This is the master volume control when the boost is inactive. [. . . ] The Contour control tunes between two different shaping circuits, with greatly different responses. With the control all the way up, the low end is slightly boosted, the mids are dropped and the high end is pushed up. 11 . "G. I. V. E. " Technology: As in all GK pre-amps, the MB² Series pre-amp incorporates what we call G. I. V. E (Gate Induced Valve Effect) Technology. We use field effect devices with the gate biased in a way that emphasizes the optimum harmonic content of the signal. [. . . ]