B-AMP Bergantino Owner's Manual - page 10
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The VHPF (turn Bass/Filters knob to adjust frequency) allows frequencies above the displayed
frequency to pass while cutting frequencies below. Factory default is 40Hz. Turning this knob
adjusts the cut-off frequency from 32Hz – 80Hz in 2Hz increments. Use this control to clean up
the very low end of the bass frequencies, which can often muddy the low-end program
information and needlessly stress your speaker system and waste amplifier headroom.
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To help minimize needless stress on speakers and maximize amplifier and overall
system headroom, it is advisable to set this control at 40Hz (factory default setting) or
higher, if further low frequency attenuation is needed.
The Variable Feedback filter is intuitively designed to help you identify and sweep the note
frequencies from E1 (41Hz) – G3 (196Hz) in single note (1/2 step) increments, and adjust the
gain from OFF to -6db to -12dB in level to help eliminate or minimize problem feedback issues
with electro-acoustic instruments.
To use, try to identify the note on your instrument that is feeding back the strongest from the
location in which you will be playing (very important as feedback is affected by the
proximity of the instrument to the boundaries and sound source in which it is near). While
muting your instrument or amp, press and release the filter knob and then turn the L/Mid or
H/Mid knob to the
note (i.e.
E1) that is feeding back the strongest. Turn the TRBL knob CCW
to set the cut level between -6db and -12db, then un-mute the amp or instrument and go back
to the same location you will be playing from and see if the feedback has been eliminated or
reduced. You may need to try this a few times and adjust the amount of cut in gain
accordingly.
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The green Filters LED indicates that either one or both of the filters are engaged.
While in the Filter screen, you can return to the home screen by pressing any of the tone
controls, or if left idle for 10 seconds, the LCD display will return to the home screen
automatically.
11. Mem1/LMID Control: This control has multiple functions:
As a Tone Control, turning the control Left or right from the home screen will decrease or
increase the level of the Lo-Mid frequencies in 1dB increments, from -9db to +9db. The level in
dB will be shown above on the LCD display.
Push and hold this control for 2 seconds, and you will be able to adjust the center frequencies
of all 4 tone controls. The frequency range of the LMID control is from 150Hz to 800Hz,
variable in 50Hz increments. You can return to the home screen by pressing any of the tone
controls, or if left idle for 5 seconds, the LCD display will return to the home screen
automatically.
If a tone setting has been previously stored in this location, when quickly pushed and released,
that tone setting will be loaded into the DSP’s tone filters, including the state of the bright