User Guide Prefix Pro Blend Acoustic Guitar System Warning! We strongly recommend that you familiarize yourself with the preamp's controls before you attempt to perform with this system. Failure to do so can produce painful acoustic feedback (see Quick Start on page 3). Please take a few minutes to read this guide and familiarize yourself with the Pro Blend's controls.
Prefix - Stereo Blender Thank you for choosing a Fishman equipped instrument. Our goal is to provide you with the finest acoustic amplification products available-systems that simply let you sound your best. With our long-standing commitment to quality, you can feel confident that your Fishman gear will provide great sound and trouble free performance for years to come. Your satisfaction is very important to us. If you have any questions, please contact us on the web at tech@fishman.
USER GUIDE At the heart of the pickup is a multi-layer sandwich of co-polymer strips. These strips sense motion across the entire length of the saddle for unparalleled performance. Compared ceramic pickups with individual elements, the Acoustic Matrix' "unitary" co-polymer design provides a more natural and balanced response, with sensitivity to both the strings and the soundboard. The transducer is fully enclosed in a shielded foil wrap for dead quiet performance and total EMI noise rejection.
Prefix - Stereo Blender 3. Increase the volume some more and play (on the low E string) the fifth fret A and above. Flip the phase switch to the position that eliminates feedback in this region. 4. Slowly increase the Volume again, until you start to hear a high squeal. 5. Lower the Contour slider all the way down and adjust the Frequency slider until the squealy feedback is eliminated. Raise the Contour slider (if possible) to just below the threshold of feedback. 6.
USER GUIDE 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. Set the Blend slider to the center position and with a small slotted screwdriver and adjust the Trim Control until both the microphone and pickup levels are balanced to your taste. Endpin Jack When you plug into the endpin jack, the Prefix Pro Blend switches on.
Prefix - Stereo Blender CONTROLS Volume Control This is a master volume control for both the pickup and the microphone. Set this as high as possible (without distorting your amp or mixer) for the cleanest signal. Notch and Phase These controls work hand in hand to suppress two adjacent ranges of acoustic feedback. When you set them properly, you can play your instrument as loud as you like, feedback free.
USER GUIDE Lower Feedback Range (E to G#) Upper Feedback Range (A and above) 7
Prefix - Stereo Blender Contour EQ The Contour slider and the Frequency knob make up this EQ. The Frequency knob lets you tune in on the specific range of sounds that you can boost/cut with the Contour (level) slider. With the Contour EQ you can boost or cut a wide range of frequencies, from gutsy low midrange (250 Hz) to brilliant high treble (10 kHz). Often your instrument will benefit from a slight midrange cut.
USER GUIDE SUGGESTED EQ SETTINGS Anti-feedback See Quick Start on Page 3 Brilliance If you are playing through a limited range amplifier (like an electric guitar amp) or have dead strings on the instrument, you can brighten up your sound by setting the Frequency knob all the way to the right and raising the Contour (level) slider to taste. If you plan to play at high stage volume levels, dial in more pickup than microphone to avoid feedback.
Prefix - Stereo Blender Suggested EQ Settings Cont’d ... Mid-Cut You can scoop out harsh midrange by setting the Frequency knob at about 12:00 and the Contour (level) slider cut to taste below the center detent. Often the desired mid-cut will fall into the same frequency range as potential microphone feedback. You can also cut midrange (pickup only) by boosting the BASS and TREBLE sliders to realize an "implied" mid-cut at 800 Hz.
USER GUIDE SPECIFICATIONS Nominal Input Level: -20 dBV Input Overload: (20 Hz - 20 kHz)-2 dBV Pickup Input Impedance: 20 M Ohms Output Impedance: Less than 3.5 k Ohms Nominal Output Level: -12 dBV THD: Less than .04 %, -20 dBV input Signal to Noise Ratio: 77 dB (A weighted referred to nominal -20 dBV input) Current Drain: Less than 4 mA Power Supply: 9V alkaline battery (estimated 140 hours continuous use with low battery indicator at 6.
Limited Warranty The Fishman Prefix Pro Blend is warranted to function for a period of One (1) Year from the date of purchase. If the unit fails to function properly within the warranty period, free repair and the option of replacement or refund in the event that Fishman is unable to make repair are Fishman’s only obligations. This warranty does not cover any consequential damages or damage to the unit due to misuse, accident, or neglect.
