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ENGLISH
GENERAL FUNCTION EXPLANATION - CON’T
TRI-ON Auto Sensing Function Switch
All XC7 ampli
fi
ers feature an automatic turn-on circuit called TRI-ON that will activate the
ampli
fi
er without the need for a connection to the REM terminal. The switch has three
positions - SIG, OFF and DC.
SIG - Signal Detect Mode
In this setting, the ampli
fi
er will monitor Channel 1 input for the presence of an audio
signal. The signal needs to be moderately loud in order for the ampli
fi
er to activate.
NOTE: in some applications where the speaker level input adapters are used and a
speaker is still connected, the voltage produced from speaker moving when a door is
closed may be adequate to trick the amp to turn on. This is the least desirable setting.
OFF - Remote Turn-On Connection Mode
In this mode, the ampli
fi
er turns on when a 12V signal is connected to the REM terminal.
This is the preferred method of turning on the ampli
fi
er.
DC - DC Voltage Detection Mode
In this mode, the ampli
fi
er will monitor Channel 1 input for the DC offset voltage produced
by a BTL type ampli
fi
er. To check for the presence of BTL, you can monitor the DC
voltage on the speaker wires of the signal source. When you turn on the source, you
should see 5-6 Volts DC (or more) on the wires when referenced to the chassis ground.
Remote Turn-On Connection
When +12V is applied to this terminal, the ampli
fi
er will turn on. When installing the
ampli
fi
er with an after market source unit, this wire is typically Blue with a White stripe.
Some OEM source units have a wire that behaves similarly.
Crossover Frequency Control
This adjustment allows the use to alter the -3dB frequency of the crossover. This setting is
adjustable from 50Hz to 250Hz.
Infrasonic Filter Frequency Control
This control allows you to adjust a high-pass
fi
lter built in to the ampli
fi
er. This can be used
to limit driver excursion when a subwoofer is used a vented enclosure with a high tuning
frequency. The control is adjustable from 10Hz to 50Hz and has a slope of -12 dB/Octave.
Phase Control
This analog control allows you to alter the phase of the output of the amp with respect
to the input signal. This is used to allow the installer to ensure that the output of the
subwoofer blends seamlessly with the midbass/midrange drivers being used in the
system. To adjust, turn the control until your system produces maximum acoustical output
at the crossover point.
Bass EQ Level Control
This control allows you to add up to 12dB of boost, centered at 45Hz to the audio signal.
Be judicious with the use of this control, as it can dramatically increase the current
requirements of your ampli
fi
er, drive the ampli
fi
er into clipping and potentially cause
damage to your speakers.
