Active Crossovers User Manual
Contents
1. CITRONIC Active Crossovers CX23 170 929 CX34 170 932 User Manual SE T ES w OOOO OOO 0 ie INPUT LOW CUT _LOW HIGH Low OUTPUT INPUT LOW CUT _LOW HIGH Low OUTPUT INPUT LOW CUT LOW MID LOW OUTPUT MID H MID OUTPUT aan leer XOVER FREG mr O FOO Oh nO CEO Ch Oh Bae nea ow rot OO TET MO cure Low Low GUT LOW LOW MID LOW AEID WIGH SAID LOW OUTPUT Features Linkwitz Riley crossover filters Mono Stereo operating modes Switchable Phase Invert Switchable Butterworth 40Hz low cut Balanced or unbalanced XLR connections www citronic com Introduction Thank you for choosing a Citronic active crossover This product has been designed to give accurate control for a multi amplifier sound reinforcement system In order to achieve the best results from this equipment and avoid damage through misuse please read and follow these instructions and retain for future reference Warning To prevent the risk of fire or electric shock do not expose any part of the unit to rain or moisture If liquids are spilled on the surface stop using immediately allow unit to dry out and have checked by qualified personnel before further use Avoid impact extreme pressure or heavy vibration to the unit There are no user serviceable parts inside the crossover refer all servicing to qualified service personnel Safety Check that the supplied mains lead is in good condition and the supply voltage is2. ain 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 frequency 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 fr
3. correct Ensure signal leads are of good condition and connected to appropriate inputs outputs Do not allow any foreign particles to enter the console through control apertures or connector apertures Placement e Keep out of direct sunlight and away from heat sources Keep away from damp or dusty environments When rack mounting avoid placing heavy units above the unit and ensure all connectors are accessible Cleaning Use a soft cloth with a neutral detergent to clean the casing as required Use a soft brush to clear debris from the control surface Do not use strong solvents for cleaning the unit Front Panel ax RO OOO 12 68 412 A na 98 6 00 n2 et fete 3 ae GB 6 e K INPUT ow nu LOW HIGH Lov Suteu ___ wen ou OUTPUT _ Eeo n INPUT LO tow T LOW HIGH Low OUTPUT sist ouTPUT IN LOW MID LOW OUTP V i 1D HIGH MID OUTP AMENN 1519 ADA ANADAN AQI Tr 26 a XOVEF ae FF a XOVER OONAN POWER CRC io OO D o Ei Q AO OO Oy oy O EN E pur a hn wc ey h HeH HIGH oureur aa INPUT emer CUT a LOW MID HIGH MID tow OUTPUT LOW MID er HIGH aaa HIGH MID OUTPUT HIGH OUTPUT Input gain Channel A Low Cut filter Channel B Low Cut filter Channel A Low High Mid High crossover Frequency Channel B Low High X over Frequency Channel A Low High Low Mid crossover Frequency Channel B Low High Low Mid crossover Frequency Channel A Low or Mid output gain Channel B Lo
4. inets with separate low frequency and high frequency speaker components woofers and tweeters but can be inefficient because it operates on the high energy output from an amplifier and dissipates much energy as heat Active crossovers operate before the amplifier s stage where the signal is typically less than a Volt affording accurate and efficient separation of the component frequencies Essentially an active crossover splits each audio signal into 2 3 or even 4 sets of frequencies feeding each into a separate amplifier which in turn powers a specific soeaker component This allows each speaker component to handle just the type of sound it produces most efficiently avoiding wasting energy from the amplifier Configuration e The CX23 can be configured as a 2 way stereo or 3 way mono crossover e The CX34 can be configured as a 2 way stereo 3 way stereo or 4 way mono crossover The connection and operating mode depends upon the type of amplifier configuration bi amp tri amp or quad amp BI AMP SYSTEM TRI AMP SYSTEM QUAD AMP SYSTEM 2 amplifiers 3 amplifiers 4 amplifiers HIGH ES LOW 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 c
5. om 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 SPECIFICATIONS ee Cx34 Cx23 Power supply 115 230Vac selectable 50 60Hz IEC Input impedance balanced 40kO 50kQ 2 5Ke 2 5kg Ensure mains voltage is correct check selector and connected properly Ensure front panel power switch and mains outlet switch are on Power is on but no audio output Output is very low level Note for further troubleshooting refer equipment to qualified service personnel for testing Citronic 2011
6. onnected 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 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 Operation 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 g
7. w Mid Mid High crossover Frequency Channel A Mid High High mid High crossover frequency Ch B Low output gain Channel A Low or Mid output phase switch Channel B Low output phase switch Channel A Low output gain Channel B Mid or Low mid output gain Channel A Low output phase switch Channel B 1 2 2 4 5 6 7 8 9 Mid or Low mid output phase switch Channel A Mid or High mid output gain Channel B High output gain Channel A Mid or High mid output phase switch Channel B High output phase switch Channel A High output gain Channel B Mono Stereo mode indicators High output phase switch Channel B Input gain Channel B Power switch Rear Panel Voltage selector Mode selector buttons IEC mains inlet Mono Normal Summed switch High output Channel B High output Channel A High mid or Mid output Channel B Low mid or Mid output Channel A Low or Mid output Channel B Low output Channel A or LF Sum both channels Low output Channel B Crossover frequency multiplier Channel A Crossover frequency multiplier Channel B Input Channel A Input Channel B What is an Active Crossover A crossover is a device for separating the high frequencies from the low frequencies in a sound reinforcement system Passive crossovers exist in speaker cabinets to split the high and low frequencies of an amplifier output and feed into the appropriate speaker components This is usually necessary in cab
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