Carvin cx 1272 owners manual
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CARVIN ENGINEERING DATA CX672 6CH, CX872 8CH & CX1272 12CH STEREO MIXER OPERATING MANU- AL THREE BAND CHANNEL TONE CONTROLS PAD -20dBPAD SWITCH HIMID LOW MICPRE CHANNEL LEVEL CHANNEL EFF SND CHANNEL MONITOR LEVEL LRMONEFF EFFECTSSUMMING AMP EFFECTS SEND 2 LEVEL MAIN RIGHTSUMMING AMPAND LEVEL MAIN LEFTSUMMING AMPAND LEVEL EFFECTS SEND 2 GAIN STAGE NINE BAND GRAPHIC EQUILIZER LEFT LINE OUT RIGHT LINE OUT NINE BAND GRAPHIC EQUILIZER EFFECTS SEND 2 INTERNAL DSP SEND GAIN REDUCTION FOR DSP MONITORSUMMING AMP MONITOR LINE OUT LEFT AMP PATCH RIGHT AMP PATCH DSP RETURN LEFT DSP RETURN RIGHT EFFECTS RETURN LEFT EFFECTS RETURN RIGHT EFF INPUT LEFT TAPE RTN RIGHT TAPE RTN LEFT STEREO RETURN FOR INTERNAL STEREO DSP RIGHT TAPE OUT LEFT TAPE OUT TO INTERNAL POWER AMP PAN DSP TO MONITOR EFF INPUT RIGHT CX 1BLOPart No. CHANNEL line pad (-26dB) 12340 World Trade Drive, San Diego, CA 92128 (619) 487-1600 (800) 854-2235 www.carvin.com Congratulations on the purchase of your CX mixer. Your new CX series mixer demonstrates CARVINÕs commitment to producing the highest quality and most sophisticated engineering in the audio industry today. The CX series mixers were designed to be professional mixers in com- pact units. The CX includes a full function stereo mixer, with two nine band graphic equalizers, a digital signal effects processor and a powerful stereo amplifier. A rack mount version is also available without power amps. Each CX series mixer is surrounded by a strong, lightweight 3/4Ó poplar plywood cabinet covered with Duratuff IIª carpeting making the CX mixer road worthy. CX OVERVIEWThe MIC/LINE input channels feature XLR and 1/4Ó LINE inputs with phantom power for condenser mics. There are 3 bands of EQ, a post fader effect send, and a monitor pre- fader send on each channel. The master section features two 9 band graphic EQs, master stereo main and monitor mix controls, a complete 16 program effects processor with send and return controls, and a stereo external effects return. ÒSHELVINGÓ EQ WITH ACTIVE TONE CIRCUITSThe CX series incorporates 3 bands of EQ per channel. They offer smooth tone curves so your adjustments will sound natural and yet be effective. The high (treble) and low (bass) ÒshelvingÓ type controls cover the complete upper and bottom portions of the audio range. The MID EQ controls are a Òband passÓ type which peak at 2.2k Hz for added presence to your mid range tones. Because CARVIN uses ÒactiveÓ tone circuits, you are able to boost or cut your tones without any signal loss to your sound. RECEIVING INSPECTIONÑread before getting startedINSPECT YOUR MIXER FOR ANY DAMAGE which may have occurred during shipping. If any damage is found, please notify the shipping company and CARVIN immediately. SAVE THE CARTON & ALL PACKING MATERIALS. In the event you have to re-ship your unit, always use the original carton and packing material. This will provide the best pos- sible protection during shipment. CARVIN and the shipping company are not liable for any damage caused by improper packing. SAVE YOUR INVOICE. It will be required for warranty service if needed in the future. SHIPMENT SHORTAGE. If you find items missing, they may have been shipped sepa- rately. Please allow several days for the rest of your order to arrive before inquiring. RECORD THE SERIAL NUMBER on the enclosed warranty card or below on this man- ual for your records. Keep your portion of the card and return the portion with your name and comments to us. INTERNAL SIGNAL ROUTINGYour balanced mic or instrument plugs directly into the high quality XLR Neurtricª connectors and is then routed into the differential circuits for excellent hum and noise cancellation. As your signal continues within the console, a double-sided printed circuit board (FR-4 fire rated) carefully guards the circuit traces with a copper shield running over the traces. This eliminates RF interference and reduces crosstalk substantially. The printed circuit board has plated-through holes which means that every component is soldered securely in three places (bottom, in the hole and on top). This offers unsur- passed component security while reducing circuit resistance for pure dynamic sound. HEADROOMHeadroom is very important when designing a mixerÑespecially for recording. Lack of headroom will cause your sound to become distorted and muddy. This can happen when you turn the volume too high, if the input signal is too hot or if excess bass or treble is added. With most mixers, you have to reduce the input gain to fight headroom problems, but this just increases noise. ThatÕs why we have taken great care in the CX series to make sure that each gain stage is properly designed and balanced for more headroom along the entire audio path. TOROID SUPPLYA big feature in the CX power supply is the precision wound Toroid transformer (not available from our competitors) that offers lighter weight with massive current capabil- ity for the power amp. The toroid based power supply also offers unsurpassed rejection of noise and hum while providing precision voltage for all preamp stages. Now you can go anywhere and never worry about inconsistent sound due to fluctuating voltages. CARVIN has spared no expense to achieve the best possible quality & performance. For your records, you may wish to record the following information. Serial No._____________________ Invoice Date_______________ CX672 / CX872 / CX1272 / CX1272R 76-01272 0798 CX672, CX872 & CX1272 SPECIFICATIONS: Frequency Response:Mic or Line Inputs: 20Hz-20KHz ±2dB Total Harmonic Distortion:Less than .1% Equivalent Input Noise:150 ohm source: -110dBu Output Noise:-90dBu Master Line Out (all levels minimum) Output Power:(Power Mixers Only) CX872 & CX1272 :8½: 175/175 w, 4½: 250/250 w 2½: 375/375 w, less than 1% THD Output Headroom:+20dB 1/4Ó unbalanced Maximum Gain:Mic in to Master Line Out: 70dB Crosstalk:Adjacent chÕs: -60db at 1KHz Common Mode Rejection:-80db at 1KHz Phantom Power:All XLR Mic in channels Channel EQ.:3 band active, LOW: 80Hz ±12dB MID: 2.2KHz ±12dB HI: 11.5KHz ±12dB Graphic EQ.:9 Band Oct. Intervals ±12dB Mic Input:Balanced XLR input Line Input:Unbalanced 1/4Ó Phone Jack Power Consumption:700VA Size:11ÓH x 19.5ÓW x9ÓD Rack Model: 8.75ÓH x 19ÓW x 7.75ÓD CX672, CX872, CX1272 BLOCK DIAGRAM
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QUICK START UPIf youÕre like most new owners, youÕre probably in a hurry to plug your CX mixer in and use it. Here are some brief instructions to get you going quickly. With the mixer unplugged and the unit turned off, complete the following procedures: 1.CONNECTING AC POWER TO YOUR MIXER ¥ Check the rear panel to make sure the mixer has the correct AC Line Voltage. (120VAC or 240 VAC) ¥ Use only a grounded (3 prong) power outlet to prevent a shock hazard. This gives the quietest grounding for your mixer. 2.CONNECTING SPEAKERS (Powered Models Only) ¥ Use the 1/4Ó speaker jacks on the rear panel to connect up to four 8½speaker systems per jack (daisy chain). The speaker cables are to be non-shielded with a minimum size of 16 gauge. NOTE: Do not run your speakers through microphone wire, gui- tar cables, or multi-conductor microphone junction boxes or ÒsnakesÓ as they are sometimes referred to. This wire is nor- mally shielded and of a very light gauge causing a sub- stantial loss of power. 3.SpeakerGuardª and the ÒPROTECTÓ LED ¥ The protect LED comes on along with the output relays in three diff erent protection modes: Shorted speaker outputs, Speaker Impedance below minimum rating, and when the amplifier exceeds maximum operating temperature. ¥ In event the LED comes on, turn off the amplifier and Identify and correct any speaker cable or speaker jack shorts and make sure the total speaker Impedance for each output is 2 ohms or greater. Also make sure the fan is not blocked and check that cool air can circu late around the rear of the mixer. 4.CONNECTING INPUTS TO YOUR MIXER ¥ For low level balanced devices such as microphones, plug into the balanced MIC inputs using a shielded microphone cable with XLR ends. ¥ For high level unbalanced devices such as instruments & Keyboards plug into the LINE input jacks using a shielded cable with 1/4Ó phone ends. Set the GAIN switch so the level con- trol is not over sensitive. 5.TURNING YOUR MIXER ON ¥ Adjust all channel and master level controls to their off positions ¥ Adjust all ÒEQÓ tone controlsÑ the channelÕs Hi, Mid, and Bass and the two master 9 Band Graphic EQÕs to their center position. ¥ Adjust all the Channel ÒPANÓ controls to their center position. ¥ Set the power amp switch (located next to main volume) out for stereo mode ¥ Turn the mixer on by the rear panel power switch and watch for the power LED to come on. Your mixer is now ready to operate. MIC CHANNEL FEATURES 1. LINE INPUT JACKThe Line input is a 1/4Ó phone jack designed for unbalanced line and instrument level inputs. Examples of these inputs would be instru- ments such as a guitar, a keyboard, an unbalanced mic, or a pre-amp output. The line input can be used at the same time the mic input is being used. 2. XLR MICROPHONE INPUTThe XLR Mic input is designed for balanced low impedance (micro- phone) input signals. The differential balanced input amplifier reduces the common noise picked up on the microphone cables. The XLR connector is wired as per the industry standard, pin 1 is ground, pin 2 is non-inverting (positive), and pin 3 is inverting (neg- ative). Phantom power is available on every XLR input jack when the phantom power switch in the master section is pressed. This feature allows condenser microphones to be run directly from the mixer. Note: When using phantom power, make sure the phantom power is switched off before connecting or disconnecting microphones to the mixer. It is recommended to allow 5 seconds for the phantom power to discharge before making any microphone connections. Also, to avoid hearing a pop, turn down the master volume when turning on the phantom power. 3. +20DB GAIN SWITCHThe gain switch increases the input sensitivity on both the line and mic input jacks by 20dB. After determining the input is too low for mixing with the level control, turn down the level control, press in the gain switch, and adjust the level again. If distortion is heard regardless of the channel level controlÕs setting, disengage this switch to eliminate over-driving of the input amplifier. 4. CHANNEL LEVEL CONTROLThe Level control adjusts the final volume of the channel beforegoing to the Pan control. Here is where the individual channel vol- umes are adjusted to make up the desired mix heard at the main outputs. A general rule to prevent distortion with in the mixer is to always keep the MAIN master level the same or higher than the channel LEVEL. 5. MONITOR LEVEL CONTROLThe Mon level control adjusts the volume of the channel going to the monitor mix. Here is where the individual channel monitor volumes are adjusted to make up the desired mix heard at the monitor out- put. The monitor level control is pre-channel level and pre-channel tone controls. This means it is unaffected by adjustments in channel level and tone controls. The purpose for this is so the main mix adjustments for tone and level can be made without disturbing the monitor mix. 6. CHANNEL PAN CONTROL The Pan control adjusts where the channel is heard in the stereo field of the stereo main outputs. If it is turned to the extreme left, then the channel will only be heard in the left main output and sim- ilarly only in the right main output if turned to the extreme right. In the center position the channel is heard equally in both the left and right main outputs. A good starting point for the pan is in the cen- ter position. Then if stereo placement is needed, a quarter turn to the desired side from the center position gives a smooth placement in the stereo field, or if desired a full turn to one side gives a hard placement. 7. CHANNEL EFFECTS 1&2 LEVEL CONTROLThe EFF 1&2 control adjusts the volume of the channel going to the internal effects Send 1 master control, and directly to the EFF SND 2 output. The effects control is post-channel level and automatical- ly tracks the channelÕs level & tone controls. 8-10. CHANNEL TONE CONTROLSEach channel features active tone controls LO, MID, and HI. Allthree function as boost (clockwise) & cut (counter-clockwise) con- trols where the center 0 position is neutral. The LO and HI controls are shelving type tone controls with corner frequencies at 80Hz and 11.5k Hz respectively. The MID control is a band pass type centered around 2.2kHz. It is suggested the channel tone controls start out in their center 0 positions. A good setting for added dynamics is to set the LO & HI at +3, and the MID at -3. MASTER SECTION FEATURES 11. MAIN MASTER LEVEL CONTROLThe Main control is the master volume control for all channels receiving the signals from the channel pan controls. The Main feeds the Graphic EQ, the main line out jacks and the internal power amplifier(s). If the power amp switch is out, then the Main control sends a stereo mix from all channels to both power amps. If the power amp switch is pushed in, then the Main controls sends a mono mix from all channels to the left power amp only, and the master MONITOR level sends the channel MON to the right power amp only. 12. POWER AMP INPUT SELECTORThe Power Amp selector selects the inputs to the two graphic EQÕs and the power amplifiers. The out position is the normal stereo power mixer mode. The inputs to the two EQÕs are the main left and right signals. In the push in position the main left/right signals are combined to pro- duce one mono signal (still controlled by the MAIN control). This mono signal becomes the input signal to the left EQ (top EQ) and the left power amp. Also, in the in position the output of the monitor jack and control knob becomes the input signal for the right EQ and right power amp. 13. MONITOR MASTER LEVEL CONTROLThe Monitor master level control is the master volume for the mon- itor mix heard in the monitor output. This volume receives its sig- nals from the channel monitor level controls. If the power amp CX672, CX872 & CX1272 CONTROLS 1 2 3 6 5 4 7 8-10 CX672, CX872 & CX1272