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P
REFIX
™ P
RO
B
LEND
Notch and Phase
These controls work hand in hand to eliminate low frequency feedback. When you set them
properly, you can play your instrument as loud as you like, without feedback.
For best results, tune the Notch filter first.
Notch
Use the Notch to scoop out the lowest range of feedback, which usually starts at the open low
E string and continues up to about the forth fret G# on the same string. This "cavity
resonance" feedback can usually be eliminated by setting the Notch control between 12:00
and 2:00 on the dial.
You may need to initially coax out low frequency feedback by raising your volume, flipping the
phase switch and moving closer to your speakers. Note that in the fully counter-clockwise
position, the Notch is effectively off.
Phase Switch
Use the phase switch to control the upper range of low frequency feedback, sometimes call
"top resonance". This feedback usually starts at the fifth fret A on the low E string and
continues up to about the twelfth fret E on the same string. Flip the Phase switch back and
forth until you find the position that subdues this range of feedback.
Note: If, after setting the phase switch, you move your position a few feet, be prepared to flip
the switch again to keep feedback at bay.
Bass
A boost/cut shelving tone control. 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.
Treble
This is a boost/cut shelving tone control. Treble affects the pickup signal only. 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.
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SUGGESTED EQ SETTINGS
ANTI-FEEDBACK
Refer to page 3.
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.
F
ISHMAN
P
REFIX
™ S
ERIES
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