User manual FISHMAN PREFIX PLUS ACOUSTIC GUITAR SYSTEM

[. . . ] The PREFIX PLUSTM can be plugged into any instrument-level audio input with excellent results. 2 ONBOARD ACOUSTIC GUITAR SYSTEM PREAMP FUNCTIONS BATTERY COMPARTMENT Pull the small tab at the top of the PREFIX PLUSTM toward you. The body of the preamp will swing out, revealing the BATTERY COMPARTMENT. Insert a fresh 9V alkaline battery. ENDPIN JACK The PREFIX PLUSTM has no ON/OFF switch. It is turned on only when an instrument cable is plugged into the endpin jack. [. . . ] BRILLIANCE CONTROL This is a resonant style boost/cut filter. When boosted, the BRILLIANCE control can add presence to your sound or brighten up dead strings. PHASE SWITCH The PHASE switch compensates for acoustic phase differences that often occur between instrument and speaker. It can be used as a tone filter at low volume levels or a feedback filter at high levels. The PHASE switch can correct any electrical phase difference between the PREFIXTM system and an outboard instrument microphone. Flip the PHASE switch several times and use your ear to find the optimum setting. The best position for the PHASE switch may change, depending on the sound system and/or venue acoustics. 4 ONBOARD ACOUSTIC GUITAR SYSTEM SUGGESTED EQ SETTINGS MID CUT You can scoop out harsh midrange by setting the FREQUENCY slider slightly above center with the CONTOUR Level cut to taste below the center detent. You can also cut midrange by boosting the BASS and TREBLE sliders to realize an "implied" midcut at 800 Hz. 5 FISHMAN PREFIXTM PLUS FINGERSTYLE This setting will add fullness to the bass and definition to the treble. 6 ONBOARD ACOUSTIC GUITAR SYSTEM CUT THROUGH For cutting through a live band mix at high volumes. 7 FISHMAN PREFIXTM PLUS WHAT IS PHASE? Phase is the relationship between two signals or soundwaves originating from the same instrument. For our purposes, phase relationships are expressed as being either "in phase" or "out of phase". In phase tends to enhance, while out of phase tends to suppress the natural characteristics and acoustic tendencies of an instrument. A simple way to determine the quality of phase (in or out) of two sounds is to compare phase switch settings at low volumes. IN PHASE In phase is when the waveforms of two sounds originating from the same instrument are similarly aligned in time. Similar phase is like looking at yourself in a mirror: your reflection directly follows your movement. OUT OF PHASE Out of phase is when the waveforms of two sounds originating from the same instrument are aligned such that the upper peak of one wave occurs at the same moment in time as the lower peak of the other. Out of phase is like looking at yourself in a live video monitor; the image you see is similar, but the perspective is shifted. When you move to the right, the image appears to move to your left. Continued . . . 8 ONBOARD ACOUSTIC GUITAR SYSTEM PHASE, Continued from Page 8 WHAT IS THE PHASE SWITCH FOR? The phase switch is useful for two reasons: 1. Due to the interactive and changing nature of phase, acoustic amplification depends on maintaining optimum phase relationships between amplified instruments, sound systems and venues. Since an industry standard for polarity has not been established for all sound equipment, the phase switch can compensate for any unintentional differences that might occur between instrument and sound system. APPLICATIONS In any situation where the instrument faces a loudspeaker, there will be an interactive phase relationship between the two. This usually occurs with stage amps, side fill and floor monitors at close distances. · LOW VOLUME AMPLIFICATION At low volumes, when an instrument and speaker are at similar levels and are in phase, the sound is full and solid, with the lower frequencies emphasized. When a mic'ed instrument and speaker are out of phase at low levels, the bass frequencies cancel out to some extent. The resulting sound is somewhat unnatural and unbalanced compared to in phase. · HIGH VOLUME LEVELS At high volume levels, when an instrument and speaker are in phase, the sound pressure from the speaker will excite the instrument's sound chamber, creating a feedback loop at the instrument's lowest octave. This "cavity resonance" feedback can be dealt with by putting the instrument and speaker out of phase or by adding equalization. [. . . ] FISHMAN retains the right to make such determination on the basis of factory inspection. Products returned to FISHMAN for repair or replacement must be shipped in accordance with the Return Policy, as follows. This warranty remains valid only if repairs are performed by FISHMAN. This warranty gives you specific legal rights and you may also have other rights which may vary from state to state. RETURN POLICY To return products to FISHMAN TRANSDUCERS, you must follow these steps. . . [. . . ]