5
fi
lter
and
full range
output (channels 3 & 4). The high pass
fi
lter will only allow high
frequency information to be passed to the speaker(s) whilst the full range output will
pass all frequencies to the speaker(s). Similarly the low pass
fi
lter will only allow low
frequency information to be passed to the speaker(s).
D. CROSS OVER FREQUENCY CONTROL
The HPF control speci
fi
es which frequencies
above
the set level will be heard (channel 1 &
2). The LPF control speci
fi
es which frequencies
below
the set level will be heard (channel 3 &
4). The frequency ranges from 50hz to 300 Hz.
E. BASS BOOST CONTROL
To provide up to an extra +12 dB of bass boost at 45 Hz. Use this boost to increase bass output
from the ampli
fi
er.
F. SPEAKER TERMINAL OUTPUT
For connection to the speakers. See system wiring overleaf for wiring examples.
G . FUSE
Please ensure the following fuse rating is used when replacing fuses:
FLI UNDERGROUND 720.4 (25 amp x 2)
H. POWER CONNECTIONS
Power connections. See overleaf for details on correct connections.
I. POWER PROTECT LIGHT
When the ampli
fi
er is operating correctly the light will illuminate constant ‘green’. When the ampli
fi
er is in
power protection mode the light will illuminate ‘red’.
Set Up Section
To correctly set the gain control of the ampli
fi
er to match that of the source (headunit) use the following setup
routine:
• Turn the gain control to minimum on the ampli
fi
er.
• Ensure the bass boost is set to 0 dB.
• On the headunit set all crossovers to
fl
at 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 ampli
fi
er until distortion can be heard in any of the speakers or until the
volume reaches an uncomfortable listening level when this is reached turn down the gain control slightly.
• The gain control is now set.
The setting of the crossover will depend on what kind of speaker you are installing. For a
subwoofer
it is
recommended that the crossover select switch is set to
low pass
and the frequency is set to match that of the
speaker speci
fi
cations. For a pair of
full range speakers
it is recommend that the crossover is set to
full
. The
LPF frequency control will then have no effect on the ampli
fi
er output and the speaker will receive a full range
signal.
NOTE: BY USING THE CROSSOVERS CORRECTLY YOU WILL NOT ONLY LENGTHEN THE LIFE
OF YOUR SPEAKERS BUT WILL ALSO GET BETTER PERFORMANCE FROM THEM. TO OPTIMISE
YOUR SETUP SEEK THE ADVISE OF A PROFESSIONAL INSTALLATION ENGINEER OR VISIT YOUR
LOCAL FLI AUDIO DEALER.
