9
Low
The Low control of the Felix preamplifier is fixed at 125Hz (+-
3dB) corner frequency / 40Hz peak, 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 acoustic instruments (banjo) may react
better to a higher corner / peak frequency, we have added a
Low control range jumper on the main PCB. Moving this
jumper shifts the Low frequency up to 250Hz (+/-3dB) corner
frequency / 80Hz peak.
This is easy to do!
We specifically
designed Felix’s chassis to make it easy to access internal
jumpers. Please refer to the jumper diagram and access
procedure on pages 12 and 13. Bravo to you for reading this
manual. You get an A.
WARNING Make sure to disconnect the power mains before
opening removing the Felix top panel to make jumper
adjustments.
Mid
The mid range section of Felix’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 preamplifier is set with a 2kHz
(+/-3dB) corner frequency/ 12kHz peak, 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
9.5 OUTPUT CONTROLS
Boost
Want Felix 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 – blended
or individual channels, amp out or either ISO out, even the
headphone out.
As you can probably imagine, if you are using a microphone
or a particularly feedback prone pickup system, adding boost
might easily send you in to feedback territory. So start small.
If you need to boost your output, start with a gentle boost
amount and work your way upwards. If you start to hear stage
feedback or are overloading the input at the console, then
you’ll need to back it off. Felix is not responsible for disgruntled
soundpeople you may encounter during the operation of the
boost circuit. He wants to keep those people happy, and you
should too.
Amp / Phones Output Level
This knob sets the output level of the unbalanced Amp and
tuner outputs on the rearpanel and also of the headphone
jack on the right sidepanel. If you are using a stage amp, use
this control as your master level. Correct input gain settings for
your sources, with the signal LED showing mostly green, should
not be adjusted to alter your stage amp level. Rather, use this
control to make master level changes.
If you are using the side panel headphone jack with the MUTE
switch activated, remember that headphone level adjustments
will also affect stage amp level, which could lead to a big nasty
sound on stage when un-muting Felix outputs. Simply make a
note of your stage amp level before making adjustments to this
control while headphone monitoring.
Mix
This control adjusts the mix, or blend, between Ch1 and Ch2.
Before using this control, its important to verify if Felix is
Blend or A/B mode. This setting is toggled via the side panel
