Front Panel

1. Input gain: Channel A
2. Low Cut filter: Channel A
3. Low/High X-over Frequency: Channel A
4. Low/High - Low/Mid crossover Frequency: Channel A
5. Low/Mid - Mid/High crossover Frequency: Channel A
6. Low output gain: Channel A
7. Low output phase switch: Channel A
8. Mid or Low-mid output gain: Channel A
9. Mid or Low-mid output phase switch: Channel A
10. High output gain: Channel A
11. High output phase switch: Channel A
12. Mono/Stereo mode indicators
13. Input gain: Channel B
14. Low Cut filter: Channel B
15. Low/High - Mid/High crossover Frequency: Channel B
16. Low/High - Low/Mid crossover Frequency: Channel B
17. Low or Mid output gain: Channel B
18. Mid/High - High-mid/High crossover frequency: Ch B
19. Low or Mid output phase switch: Channel B
20. Low output gain: Channel B
21. Low output phase switch: Channel B
22. Mid or High-mid output gain: Channel B
23. Mid or High-mid output phase switch: Channel B
24. High output gain: Channel B
25. High output phase switch: Channel B
26. Power switch

Rear Panel

27. Voltage selector
28. IEC mains inlet
29. High output: Channel B
30. High-mid or Mid output: Channel B
31. Low or Mid output: Channel B
32. Low output: Channel B
33. Crossover frequency multiplier: Channel B
34. Input: Channel B
35. Mode selector buttons
36. Mono Normal/Summed switch
37. High output: Channel A
38. Low-mid or Mid output: Channel A
39. Low output: Channel A (or LF Sum both channels)
40. Crossover frequency multiplier: Channel A
41. Input: Channel A

Configuration

The connection and operating mode depends upon the type of amplifier configuration (bi-amp, tri-amp or quad-amp)

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.