Carvin manual CX672, CX872 & CX1272 Controls, Master Section Features, MIC Channel Features

CX672, CX872 & CX1272 CONTROLS

QUICK START UP

If you’re like most new owners, you’re 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 1/4” speaker jacks on the rear panel to connect up to four 8Ω speaker 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 “snakes” as they are sometimes referred to. This wire is nor-

mally shieldedand of a very light gauge causing a sub- stantial loss of power.

3.SpeakerGuard™ and the “PROTECT” LED

• The protect LED comes on along with the output relays in three

diff erent protection modes: Shorted speaker outputs,

going 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 CONTROL

The 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

three 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 CONTROL

The 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.

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 &

CX672, CX872 & CX1272

Keyboards plug into the LINE input jacks using a shielded cable

with 1/4” 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 “EQ” tone controls— the channel’s Hi, Mid, and Bass and the two master 9 Band Graphic EQ’s to their center position.

•Adjust all the Channel “PAN” 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 JACK

The Line input is a 1/4” 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 INPUT

The 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 SWITCH

The 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 control’s setting, disengage this switch to eliminate over-driving of the input amplifier.

4. CHANNEL LEVEL CONTROL

The Level control adjusts the final volume of the channel before

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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 CONTROL

The 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

2output. The effects control is post-channel level and automatical- ly tracks the channel’s level & tone controls.

8-10. CHANNEL TONE CONTROLS

Each channel features active tone controls LO, MID, and HI. All

12. POWER AMP INPUT SELECTOR

The Power Amp selector selects the inputs to the two graphic EQ’s and the power amplifiers. The out position is the normal stereo power mixer mode. The inputs to the two EQ’s 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 CONTROL

The 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