the head-unit and carefully re-check the steps 2.6.1 to 2.6.5
The same applies, if the LED does not light-up at all.
3.1 Input Sensitivity Setting („LEVEL“)
To obtain the best sound quality and dynamics from your car-audio system,
it is essential to set the correct input sensitivity on the amplifier. This setting has
direct influence on the signal to noise ratio and the maximum distortion free
power output.
„Level“ Adjustment Tips
Turn the "LEVEL" control knob counter-clockwise to its minimum position.
Set the volume control of the head-unit to approximately 3/4 of full volume.
While playing a dynamic track, slowly increase the "LEVEL" control of the am-
plifier, until you reach the first signs of distorted sound. Slowly turn back the
"LEVEL" control, until the distortion disappears. This is the correct input sen-
sitivity setting.
Considering the 4-channel model EA490 this procedure has to be carried out
twice, once for the front channels and once for the rear channels. In case you
12
2.6.2 Connect the loudspeaker wires.
Use speaker cable of mini-
mum 1,5 mm
2
- preferably 2,5 mm
2
cross section. When stripping wires for
connection, remove approximately 8 mm of the insulation. Insert the bare
ends into the speaker terminal output section on the amplifier. Be sure to fol-
low correct polarity ("
" to "
"; "
" to "
" ). Tighten the allen screws of
the amplifier.
2.6.3 Run the positive power cable („+12 V“) directly from the
positive terminal of the car battery to the amplifier.
To protect
your car audio system against shorting and your entire car against electri-
cal fire hazards, you must insert a main-fuse (holder) within the first 30 cm of
the battery. Do not insert the fuse until the wiring is completed!
Now you route the ground cable to the amplifier.
A very close
point of the chassis ground to the amplifier is preferable. The ground cable
should have the same cross-section as the positive ("+12V") power cable! The
contact-point on the car chassis must be solid and clean, i.e. free from rust or
paint etc. A bad ground contact not only brings an increased risk of interfe-
rences but also drastically reduces the voltage resulting in reduced power out-
put and high distortion already at low listening levels.
2.6.5 Close the electrical circuit by inserting the main fuse.
After turning-on the head-unit, the mode/operating LED of the power ampli-
fier should light-up green. If the LED is red, the installation is faulty! Turn off
SETTINGS
EA2190490 Manual neu 31.07.2000 19:02 Uhr Seite 12
