AVSL Citronic CX34 - Manual (Page 5)

5 170.929UK, 170.932UK User Manual
Connection
In all configurations, the output(s) (left and right or mono) from the signal source (usually the main mixing
console) are connected to the input(s) of the crossover. All connections are balanced (or unbalanced, if
preferred) and should be connected using good quality XLR leads.
In a bi-amped system, the LOW (or LF SUM) outputs are connected to the inputs of the power amplifier which
will drive the sub cabinets and the HIGH outputs are connected to the inputs of the power amplifier which will
drive the mid-top cabinets.
In a tri-amped system, the LOW (or LF SUM) outputs are connected to the inputs of the power amplifier which
will drive the sub cabinets, the MID outputs are connected to the power amplifier which will power the main
drivers of the mid-top cabinets and the HIGH outputs are connected to the inputs of the power amplifier
which will drive the high frequency drivers in the mid-top cabinets.
In a quad-amped system, the LOW (or LF SUM) output is connected to the input of the power amplifier which
will drive the sub cabinets, the LOW-MID output is connected to the power amplifier which will power the
dedicated mid-range cabinets, the HIGH-MID outputs are connected to the power amplifier which will power
the main drivers of the mid-top cabinets and the HIGH outputs are connected to the inputs of the power
amplifier which will drive the high frequency drivers in the mid-top cabinets
Operation
Connect the crossover to mains power via the supplied IEC lead, ensuring the supply voltage is correct. There
may be slight variations from these set-ups but all follow the same basic principles.
It may help to know the frequency responses of all speaker components in the system or alternatively,
crossover setup can be done by ear. The main parameters are the crossover frequencies and gain amounts for
each output. Select the MODE that the crossover is to be used from the buttons on the rear panel. Each mode
gives controls different parameters, so care must be taken to read the control’s function printed on the front
panel for the given mode. If tri-amped or quad-amped systems are used, the Crossover frequency multiplier
should be pressed in for MID/HIGH or HIGH-MID/HIGH crossover points. This causes the frequency control to
operate at a much higher frequency (10x) which is more suited to the division between mid and high drivers.
With all amplifiers switched off, turn down all GAIN controls and switch on the crossover. Switch on amplifiers
and turn up the volume of each output. Play the signal from the sound source (mixer) through the crossover
and gradually increase the gain controls of each section. Gradually rotate the XOVER FREQ (crossover
frequency) control for LOW/HIGH or LOW/MID or LOW/LOW-MID until the desired bass character is achieved.
This is the control that determines the highest frequencies that will be fed into the sub cabinets. Lower
crossover settings will need higher gain settings to compensate for frequencies that are not fed into the sub
cabinet (filtered out).
Repeat the crossover frequency setting process for LOW-MID, MID, HIGH-MID and HIGH frequencies (where
appropriate) adjusting the crossover frequencies to suit each driver and gains to balance the range of
frequencies. Occasionally, frequencies from some cabinets in stereo setups can have opposing phase
characters. Also, some drivers may sit physically further back from others. This can cause cancellation of
frequencies. To deal with this, the Citronic crossovers have Phase switches, which can be pressed in to invert
the phase of the signal (push becomes pull and vice versa). This can be tested by trial and error to hear if
pressing the switch in has a beneficial effect to the volume level of that particular frequency. To further help
avoiding phase cancellation, the LOW can be “summed” to a mono signal (LF SUM), eradicating differing
signals in the lower registers of a stereo signal.
Remember to turn down amplifiers and switch off prior to powering down the crossover to avoid loud noises
in the sound system.