Signal Connections
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SIGNAL CONNECTIONS
Review the systems diagram section and choose the best variation for your vehicle. This should
give you a good idea of how many RCA cables you will need. Choosing the correct length and style of RCA
patch cables is very important. Better RCA cables have either multiple layers of shielding or twisted pair
wiring and gold plated terminals for better noise reduction and outstanding contacts. Be extra careful when
running your RCA patch cables. Car environments are notorious for poorly insulated wires. This means that
hiss, engine noise, and fan noise can be easily picked up through RCA cables if ran incorrectly. As a
precaution, avoid placing your RCA cables near large wire looms and electronic fans whenever possible.
Starting at the source, connect the patch cables to the RCA output. Run the cables to the location
of the AEX250X / AEX350X. Connect your patch cables to the inputs. Be sure to check for correct balance on
both the radio and crossover.
Now it's time to run the output connections. Be careful to link the outputs via RCA patch cables to
the correct amplifiers. Avoid entanglement between the RCA cables and the power wires. Once again, check
for correct balance on both the radio and crossover. You may now reconnect your battery and install a 3 amp
fuse into the fuse holder.
CROSSOVER
Determining the best crossover points for your speakers is critical. The size of the speaker, it's
power handling characteristics, and frequency range need to be taken into consideration as with the location
of the speaker in order to choose the correct crossover point.
LEVEL ADJUSTMENTS
Before you switch on the radio, you have to complete some very important adjustments in order to
fine tune your system. These are the level controls. Follow the steps below starting with the preliminary
adjustments.
PRELIMINARY ADJUSTMENTS
1. Adjust the input level of the AEX250X / AEX350X to 2/3 maximum.
2. Preset the subwoofer, mid and high pass output level of the AEX250X / AEX350X to slightly above
minimum gain.
3. Change the equalizer switch to the off position. Set the equalizer bands to flat zero.
4. Set the input levels of the amplifiers to 1/4 maximum.
5. Activate the radio power. Set the tone controls, balance, and fader controls to the center or flat position.
6. Adjust the volume of your radio to 3/4 of maximum volume. Listen carefully to make sure the music is not
clipping.
7. Start the output level adjustments by adjusting the weakest part of your system first. This may be the
subwoofer, mid or high-pass, depending on the system. Turn the level control up until audible distortion is
heard then turn it down until it is not audible. Make a note that most amplifiers will not accept more than 8
volts of input, so the output levels should seldom be over 3/4 maximum output. Adjusting the level above
3/4 can lead to the amplifier clipping and damaging your speakers and or amps.
8. Take a few minutes now to listen to the system to determine if the settings are satisfactory. Adjust the
volume knobs to several different levels and fine tune your settings. You should do this using music tracks
you know well.
9. Change the EQ defeat switch back to the EQ setting.
ADJUSTING AND TUNING
