User manual FENDER 3018 POWER AMPLIFIER

[. . . ] Sound-wise, the Acoustic MatrixTM exhibits a sensitivity and dynamic range that far surpasses all other known pickups. The Acoustic MatrixTM transducer is a fully EMI shielded, multi-layer sandwich of co-polymer strips that run the length of the pickup. This design allows the pickup to sense the motion of the entire saddle length, providing superb string to string balance, as well as sensitivity to both the strings and the soundboard of the instrument. THE MICROPHONE The microphone, in conjunction with PHASE, NOTCH and CONTOUR controls (see page 6), will provide very high level sound reproduction before feedback. [. . . ] The pickup signal will add significant attack and definition to your sound. FUNCTIONS Battery Compartment Pull the small tab at the top of the ProblendTM toward you. The body of the preamp will swing out, revealing the BATTERY COMPARTMENT. Install a fresh 9V alkaline battery. Microphone Trim Control A small circular potentiometer is located on the side of the preamp that faces the back of the guitar. This control can be accessed by opening the battery compartment. Use this control to fine tune the microphone volume, in relation to the pickup volume. To adjust the microphone trim control, set the BLEND slider to the center position and, with a slotted jewelers screwdriver, turn the potentiometer until both the microphone and pickup levels are balanced to your taste. POWER The PrefixTMProBlend has no ON/OFF switch. To turn on the power, plug an instrument cable into the endpin jack. To conserve the battery, remove the instrument cable from the endpin jack when the unit is not being used. It is a good idea turn down your amp or mixer's input before you plug into this input. Doing so will protect your speakers (and your ears) from loud pops and thumps. 4. This control affects the pickup signal only. In the center position the bass control does not affect the circuit. Contour EQ With this you can boost or cut a wide range of frequencies from gutsy low midrange (250 Hz) to squeaky-clean highs (10 kHz). Contour affects both the pickup and microphone signals. The CONTOUR level slider controls the amount of boost or cut applied to the selected Contour FREQUENCY. The center detent yields a flat response. The Contour FREQUENCY slider determines the frequency band that is boosted or cut by the CONTOUR Level control. The frequency is variable between 250 Hz and 10 kHz. BRILLIANCE If you play through an electric guitar amplifier, or use dead strings on the instrument, you can brighten up your sound by setting the Contour FREQUENCY slider at 4:00 and raising the contour LEVEL to taste. If you plan to play at high stage volume levels, dial in more pickup than microphone with the Blend control to avoid feedback. Treble This is a boost/cut shelving tone control. In the center position the treble control does not affect the circuit. Blend balances the microphone and pickup signals. This control can be used as a feedback "escape hatch" if you ever need to instantly shut off the microphone during a performance. 5 6 P REFIX TM P RO B LEND F ISHMAN P REFIX TM S ERIES WHAT IS PHASE?Phase is the relationship between two signals or sound waves originating from the same instrument. [. . . ] USING THE PHASE SWITCH TO REDUCE FEEDBACK. Inverting the PHASE switch will put the mic'ed instrument and speaker out of phase with each other, cancelling the low frequency feedback. If you move from your position on stage more than a few feet, you may have to invert the PHASE switch again to maintain an out of phase relationship between the mic'ed instrument and speaker. Continued . . . Here's why: A typical guitar has a cavity resonance of about 100 Hz. This is the frequency that generally feeds back when a mic'ed guitar and speaker are in phase. [. . . ]