User manual FISHMAN LOUDBOX

[. . . ] Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A groundingtype plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. [. . . ] In general, boost bass at low volumes and flatten it out (or cut) at higher levels. With the dial set at 12:00, the control is effectively out of the circuit. TM Mid A resonance style filter, ±12dB @ 1. 2kHz. This control affects how well the instrument blends in or stands out in the mix. At loud volumes a midrange cut will achieve a more natural sound. With the dial set at 12:00, the control is effectively out of the circuit. High Shelving treble, ±12dB @ 10kHz. Boost highs to add "air" to the sound of the instrument. With the knob set at 12:00, the control is effectively out of the circuit. Brilliance A Resonance style tone circuit, ±12dB @ 10kHz. Add presence and "zing" to high frequencies. With the knob set at 12:00, the control is effectively out of the circuit. Anti-Feedback A Fixed level, variable frequency notch filter -14dB @ 20 - 400Hz. If you encounter low frequency feedback, sweep this control to isolate and eliminate it. Many guitars will benefit with the Anti Feedback knob set at about 11:00. The Anti Feedback filter is off at 7:00 position. 6 Phase Use the phase switch in conjunction with the Anti Feedback filter to eliminate acoustic feedback About Acoustic Feedback Feedback usually occurs in the lowest octave of your instrument, generally around two notes about a half step apart. Like blowing air across a bottle, the lower type of feedback (cavity resonance) starts when the resonant air chamber inside your instrument is excited by the sound pressure coming out of the speakers. We have found that it is effective to tune out an instrument's cavity resonance feedback with the Anti Feedback (notch filter) in the Loudbox. For acoustic guitar this occurs at G# on the low E-string, or at about 100Hz. Turn the Anti Feedback knob to about 11:00 to dial out this resonance. Note that the circuit can be effectively defeated by moving the dial to the OFF (7:00) position. The higher range of feedback (top resonance) usually starts about a half or whole step above cavity resonance of the instrument. Top resonance feedback happens when the resonant frequency of the soundboard of your instrument is excited by the sound pressure coming off the speakers. For acoustic guitar this occurs at A and above on the low E-string. Push the Phase switch in and out until you find the position that subdues top resonance feedback. Reverb This is a classic spring style reverb that we have meticulously voiced for acoustic instruments. Mute Silences the speaker and the XLR output for tuning or during breaks. Engage the mute switch when you change instruments to avoid loud electronic "pops". [. . . ] Contact Fishman Transducers Factory Service via email (tech@fishman. com) to obtain a Return Authorization number (RA number). Products returned without an RA number will be refused. Pack the amplifier in its original shipping carton. If you do not have the carton, request one from us when you get your RA number. [. . . ]