Fishman PREFIX PLUS-T - SCHEMA User manual
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USER GUIDE
PREFIX PLUS-T
Welcome
Thank you for making Fishman a part of your acoustic experience. We are proud
to offer you the finest acoustic amplification products available; high-quality
professional-grade tools to empower you to sound your very best. We are
confident Prefix Plus-T will both enhance and inspire your music making.
3
Quick Start
Before you begin, set the controls as shown:
1. Plug in • Use a ¼-inch instrument cable.
2. Tune up • Press the Tuner button. When
engaged, Tuner
mutes the output. Press again
to exit Tuner.
3. Turn up • Raise the Volume.
4. Pickup tone • Adjust tone controls.
4
Controls
Volume • For the cleanest signal, set the volume knob as high as possible,
without causing distortion or feedback.
Bass • Boost here to add depth and weight to the sound of the guitar.
Middle • Turn the middle knob all the way left for a smooth “scooped out”
tone at high volume levels. Raise the middle knob to the right of center to add
midrange “bite” to the sound.
Treble • Boost to cut through the mix. Cut to mellow and subdue the sound.
Brilliance • This slider can add shimmer and sparkle to your sound. It zeros in
on crisp high frequency tones, the realm of harmonics and acoustic string sound.
Lower the brilliance slider to reduce finger noise and fret buzz.
Notch • Tune the notch filter to remove low-end feedback. Raise the volume
until feedback occurs, then slowly turn the notch to the right until the feedback is
eliminated.
5
Tu n e r
Depress the Tuner button to turn the circuit on and off. This digital chromatic
tuner accommodates all standard and alternate tunings and mutes the output
when engaged. It can be activated without an instrument cable connected, in
which case it will turn itself off after three minutes.
Note: the tuner is calibrated to A=440.
6
Phase
Use the Phase switch to improve bass response at low volume and suppress
feedback at high volume. If feedback occurs, push the Phase switch. If feedback
recurs when you change your location, press switch again.
7
Power
Plug in the guitar, and the Prefix Plus-T switches on. The Battery LED will flash
once at power-up to tell you the preamp is on.
Low Battery Indicator
When the Battery indicator lights steadily, it is time to change the battery. To
conserve power, unplug the instrument and turn off the tuner when not in use.
Replace the battery by flipping open the preamp body using the latch located at
the top of the preamp. Be sure to observe the correct polarity during this instal-
lation.
8
Sample Settings
Fingerstyle “Scooped” Mid
This will add fullness to the bass This setting emphasizes extreme bass
and definition to the treble. and treble
9
Strummer Cut Through the Mix
A good setting for strumming chords. When you need to be heard through a
loud band.
10
Electrical Specifications
Nominal Input Level: -20dBV
Input Impedance: 20MOhm
Output Impedance: Less than 3.5kOhm
Nominal Output Level: -12dBV
THD: Less than .04 %, -20dBV input
Noise Floor: -97dBV
Dynamic range: 104dB
Battery Life: 150hrs. (tuner off)
Notch Filter Range: 30Hz – 300Hz (-15dB)
Bass control frequency: 60Hz
Treble control frequency: 10kHz
Contour control frequency: 250Hz – 3kHz; Q = 0.5
Brilliance control frequency: 10kHz; Q = 0.5
All specifications subject to change without notice.
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