The most likely frequency to feedback on a guitar or acoustic bass
may be centred around 250-260Hz, which may have the notch filter
applied. The most likely guitar string to start resonating into
feedback is the 5th (“A”)
An audience in an enclosed performance space will soak up a lot of
sound reflections and discourage feedback as if MABS, or Mobile
Acoustic Baffles! Check that a power amp output or headphone
output is not plugged into EDB-2 VAP inputs
20.2 UNEVEN STRING AMPLIFICATION, HARSH or BOOMY
SOUND?
Use Notch Filter or EQ controls to hone in on and cut troublesome
frequencies
If driving the valve or another device into clipping or distortion, back
off gain or valve blend and increase Master accordingly
Under saddle pickups may not be fitted or seated correctly and
evenly on the instrument. Contact a professional luthier in order to
have the installation checked and put right
If a contact pickup is in use, change its placement in order to get the
best sound by locating the sweet spot and avoiding honks,
resonances and hollowness
If a microphone is in use, change its position to obtain the best
balance and overall sound. Guitars often “mic up” best with
P. 83
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