9
frequency. This is used predominantly to find and remove a
specific problem frequency that may be feeding back through
stage monitors or amps, or to simply cut out a very specific,
narrow unwanted part of an instrument’s frequency range. This
notch uses the same frequency sweep of 20Hz – 1.0kHz.
GAIN
Hz
40
125
20k
1k
0dB
-12dB
NOTCH FILTER
Under normal operation, if you don’t have a use for a notch
filter, we recommend you leave the left side panel DIP switch in
the HPF setting. That way, with the HPF set in its fully counter
clockwise position, this entire filter control is effectively out of
the signal.
Low
The Low control of the Felix 2 preamplifier is fixed at a 125Hz
corner frequency with a gain range of -12 to +12dB. This is a
fixed shelving type control, which means everything below
the 125Hz is boosted or cut. Use this control for cutting and
boosting bass frequencies. It’s all about the bass.
GAIN
Hz
40
125
20k
12k
0dB
-12dB
+12dB
LOW SHELF EQ
Also, because certain instruments may react better to a higher
corner, we have added a Low control range jumper on the main
PCB. Moving this jumper shifts the Low corner frequency up to
250Hz.
This is easy to do!
We specifically designed Felix 2’s
chassis to make it easy to access internal jumpers. Please refer
to the jumper diagram and access procedure on page12. Bravo
to you for reading this manual. You get an A.
WARNING: Make sure to disconnect the power mains
before opening removing the Felix 2 top panel to
make jumper adjustments.
Mid
The mid range section of Felix 2’s equalizer is fully parametric,
which enables you control the mid range gain, frequency and Q
independently. The range of these controls are:
Gain
= +/- 12dB,
Freq range LO setting
= 70Hz – 880Hz
Freq range HI setting
= 670Hz – 8.0kHz
Q
= .5 – 5
The frequency range can be switched between the LO and
HI settings via the left side panel DIP switch locations # 3 & 4.
With these two available ranges, the over all range of the mid
controls is very wide, which enables targeting of specific sonic
areas of a multitude of instrument or pickup types.
GAIN
Hz
20
1k
20k
MID EQ
0dB
-12dB
+12dB
Q
Q factor determines the sharpness of the bandwidth of the
frequency being adjusted. A higher Q factor setting – turning
the Q knob further clockwise - creates a sharper bandwidth
and thus a more targeted, surgical EQ adjustment. Alternately,
a lower Q factor - turning the Q knob further counter clockwise
- creates a broader tonal adjustment.
High
The High control of the Felix 2 preamplifier is set with a 2kHz
corner frequency, with a gain range of -12 to +12dB. This is a
fixed shelving type control, which means everything above
the 2kHz is boosted or cut. Simply put, this is a treble control.
If you think your banjo may be too bright, turn this knob
counterclockwise. If you think your guitar needs a little more
bite, turn this knob clockwise. If you’re not sure, then get down
there and start turning it one way or the other until it sounds
better.
GAIN
Hz
20
2.0k
20k
12k
HIGH SHELF EQ
0dB
-12dB
+12dB
Similar to the Low shelf, we have added a High control range
jumper on the main PCB. Moving this jumper shifts the High
corner frequency down to 1kHz. Please refer to the jumper
diagram and access procedure on page 12.
9.5 OUTPUT CONTROLS AND SETTINGS
Boost
Want to go to eleven? How about twenty? This knob sets the
amount your signal is boosted when you activate the ‘BOOST’
footswitch. Fully counter-clockwise is zero boost added,
fully clockwise adds +10dB of boost. The boost is global, so
it is added to every signal output leaving Felix 2 – blended
or individual channels, amp out or either ISO out, even the
headphone out.
This circuit will be set as global, and the boost will be applied
to both channel’s outputs. However, boost can be defeated on
CH1 by setting the internal jumper J3 to “CHANNEL 1 BOOST
OFF”. This is useful if you are using a microphone in CH1 that
you would rather not boost and create havoc in the monitors.
Amp / Phones Output Level
This knob sets the output level of the unbalanced Amp and
