FLI TRAP 10A, Instruction & Installation Manual

Set Up Section
Gain Control Setting

To correctly set the gain control of the amplifier to match that of the source (headunit) use the

following setup routine:

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Turn the gain control to minimum on the amplifier.

On the headunit set all crossovers to flat and both bass and treble to zero.

Turn up the source (headunit) to approx 3/4 volume.

Very slowly turn up the gain on the amplifier until distortion can be heard in any of the 

speakers or until the volume reaches an uncomfortable listening level when this is reached 

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turn down the gain control slightly.

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The gain control is now set.

Crossover Setting

All FLI active enclosures come with a built in Frequency Control. This will allow you to set the

frequency at which the amplifier filter will take affect.It is variable from 50 Hz - 250 Hz. 50 Hz will

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produce only low frequencies, very deep bass. Whilst 250 Hz will produce low and higher punchy

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bass frequencies. In the correct set up the bass should not be overly prominent, although some

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users may wish to have a bigger bass presence.

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To set this correctly follow the following routine:

Firstly set the gain control correctly as described above.

Play a known piece of dynamic music through the entire system.

Use the Frequency Control to blend the frequencies from the subwoofer into the rest of the

vehicle so that the bass coming from the enclosure disappears' or blends in with the rest of 

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the car speakers.

The crossover is now set. 

Troubleshooting

Before removing the amplifier, refer to the list below and follow the suggested procedures.

If in any doubt get help from a car audio installation expert or FLI dealer.

Amplifier Will Not Power Up. Power On Indicator Not Illuminated

Check for good ground connections. Ensure its connected directly to bare metal and not a 

painted surface. 

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Using a multimeter check that the remote terminal has at least 10V DC.

Using a multimeter check that the battery voltage on the positive terminal is at least 12V DC..

Check all fuses.

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Fuse Blown

Check both positive supply and ground for shorts.

Check that the positive wire is connected to the positive terminal on the amplifier.

Check that the negative wire is connected to the ground terminal on the amplifier. 

FL250 - Ensure that the a 20 amp fuse is fitted

FL500 - Ensure that the a 25 amp fuse is fitted

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