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ACOUSTIC GUITAR SYSTEM
3
QUICK START
To successfully combine microphone and pickup signals, it is best to start by
presetting the microphone EQ to control feedback, then mixing in the pickup.
The PREFIX™ ONBOARD BLENDER™ features three ways to control feedback;
a PHASE switch, NOTCH filter and semi-parametric CONTOUR controls.
Follow these steps to achieve a strong, feedback-free microphone response.
1. Before plugging in, set all controls as follows:
• NOTCH and VOLUME fully counter-clockwise
• All EQ sliders at center position
• BLEND slider at MIC position
2. Plug in the instrument (see THE PREAMP section) with your amplifier set as
desired.
3. Slo
wly increase the VOLUME until the guitar and speaker are approximately
the same level. Play the lower strings and flip the PHASE switch. Leave the
switch in the position that sounds the deepest and clearest. (See page 8)
4. Slo
wly increase the volume until the instrument starts to rumble or howl with
low to mid level feedback (100-200 Hz).
5. Adjust the NOTCH filter until the feedback is eliminated.
6. Slo
wly increase the VOLUME again, until you hear a squeal (high frequency
feedback).
7. Lower the CONTOUR Level all the way down. Slowly adjust the Contour
FREQUENCY slider until the feedback is eliminated. Raise the CONTOUR
Level slider (if possible) to just below the threshold of feedback.
8. Gradually mix in the pickup signal by adjusting the BLEND slider.
The pickup signal will add significant attack and definition to your sound.
9. Adjust the BASS and TREBLE controls as desired.
Please note that these controls will affect pickup signal only.
10. Double check the PHASE switch position until you find the clearest response.
11. Play your guitar as loud as you want.
See diag
ram on page 6