In-Dash
tm
FOUR.1
i
Owner’s Enjoyment Manual
9. Input Gain Control:
These potentiometers are
used to increase the amount of signal voltage to your power
amplifiers. With these controls you can provide up to 13
volts (peak) to your amplifier’s inputs. Check with your
amplifier manufacturer’s specs to determine exactly how
much voltage they can really handle. If you are using
AudioControl components after your FOUR.1
i
, they can
handle the maximum output of the FOUR.1
i
. More info on
this in the section on “Level Matching” - page 11.
10. Output Jacks:
Next to the inputs are the outputs
which should be connected to the front and rear amplifiers,
if applicable. A pair of EQLs and a 3XS would work wonder-
fully here.
11. Balanced Output Selector:
This control allows
you to send either a balanced or an unbalanced signal
downstream to the next component in line. If the next
component in line has balanced inputs (like most AudioCon-
trol products) the signal will be protected from radiated
noise (up to 55db).
12. Illumination Selection:
These jumpers let you
change the backlight illumination to green or amber. Given
our devotion to protect the rainforest, we have shipped the
FOUR.1
i
in the green mode.
13. Ground Isolation Selector:
This feature allows
you to change the power supply ground for different sys-
tems. When the FOUR.1
i
is shipped from the factory, the
selector is in the fully isolated position (which is generally
the best). Alas, not every manufacturer (or installer) devotes
so much time into getting their grounds right. Therefore, we
have provided other ground isolation options to help if you
have ground loop noise (alternator whine) in your system.
Experiment with different settings if you run into this type
of problem. To change the settings, turn the system off,
carefully move the black jumper from the center two pins
(Isolated) and move it to either the top two pins (Ground) or
the bottom two pins (200ohm).
If you don’t feel comfortable with everything you have
read up to this point, run, don’t walk, to your nearest autho-
rized AudioControl dealer and have them install it. Life is
too short to be tearing your hair out over your car audio
system.
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