Installation manual

14
15
The XOM mix control blends the higher tone sounds of both the
UST and AST.
BALANCE ADJUSTMENT OF THE PICKUP’S INPUT GAIN
The A6T has a dedicated input gain balance control located at the
backside of the preamp. The control is accessed through a small
hole with a screwdriver or may have a shaft sticking out from the
back that can be adjusted with fingers (see pictures). This control
is used to set the basic balance of the UST and AST so the pickups
can have equal output signal strength. This works in conjunction
with the XOM circuit. The control is set at the factory at a approxi-
mately 50 / 50 equal blend.
When using the XOM control and the sound is not balanced – for
example, if the UST side sounds louder than the AST – OR – the
AST side sounds loud or distorted – the input gain control can be
adjusted to get a more balanced mix.
As the control is at the back of the preamp (inside the guitar),
the strings will need to be loosened to get access the back of the
preamp.
With the back, or bottom, of the A6T preamp up (so you are looking
at the bottom) turning the input gain control counter-clockwise will
blend more of the UST pickup into the mix. Turning the input gain
control clockwise will blend more of the AST into the mix.
To check this, play the system through an amp system and listen to
sound of both sides of the mix control. Most likely the UST can have
a little hotter output (louder) than the AST.
6. N DEP (NOTCH DEPTH ROTARY CONTROL)
7. N FREQ (NOTCH FREQUENCY ROTARY CONTROL)
The two rotary controls are for feedback control. Feedback is the
undesirable sound that sometimes occurs at medium to loud volume
levels and sometimes when standing close to the speaker that is
reproducing the guitar sound.
The N DEP (notch depth) and N FRE (notch frequency) can help
control feedback.
The N DEP at “0” is off; at “-6” it cuts the level of the N FRE by six
decibels; and “- 15” by fifteen decibels.
The N FRE indicates a range of frequencies that can be affected
from 100 Hz to 330 Hz.
Set up by first turning the N DEP off to the full counter clock-wise
position “0”. Set the rest of the controls to suit your taste taking care
that as you do this control any initial feedback by turning down the
volume control. Once you set your sound turn the volume control up.
As you reach a feedback threshold and hear feedback, turn the N
DEP up half way and using the N FRE find the frequency where the
feedback is reduced. Once this is found you can move the N DEP
either way to make this effect stronger or weaker.
The Notch Depth and Frequency should be used sparingly as they
will affect the tone.
Once you experiment with the settings of these controls you will find
more about how they work.
8. PHASE (PHASE BUTTON)
The PHASE button controls the phase of the pickup in relationship to
the phase of the speaker(s) that are being used with the system.
Pushing this button in will put the pickup “out of phase” with the
speaker(s). When the button is out the pickup are “in phase.”
Input
Gain Control