PROFESSIONAL MIXER CONSOLE

4/7 channel mic/line mixer

Manufacturer: M.D.G.Pro Audio&Digital Musical Instrument Division

Model: V981800 504CRCR1.3-14D0

Safety Instructions

[CAUTION] To reduce the risk of electrical shock, do not remove the cover (or back). No user serviceable parts inside; refer servicing to qualified personnel.

[WARNING] To reduce the risk of fire or electrical shock, do not expose this appliance to rain or moisture.

[Electrical Hazard Symbol] This symbol, wherever it appears, alerts you to the presence of uninsulated dangerous voltage inside the enclosure, voltage that may be sufficient to constitute a risk of shock.

[Manual Reference Symbol] This symbol, wherever it appears, alerts you to the important operating and maintenance instructions in the accompanying literature. Read the manual.

Detailed Safety Instructions:

  • All safety and operation instructions should be read before the appliance is operated.
  • Retain Instructions: The safety and operating instructions should be retained for future reference.
  • Heed Warnings: All warnings on the appliance and in the operating instructions should be adhered to.
  • Follow Instructions: All operation and user instructions should be followed.
  • Water and Moisture: The appliance should not be used near water (e.g., near a bathtub, washbowl, kitchen sink, laundry tub, in a wet basement, or near a swimming pool etc.).
  • Ventilation: The appliance should be situated so that its location or position does not interfere with its proper ventilation. For example, the appliance should not be situated on a bed, sofa, rug, or similar surface that may block the ventilation openings; or placed in a built-in installation, such as a bookcase or cabinet that may impede the flow of air through the ventilation openings.
  • Heat: The appliance should be situated away from heat sources such as radiators, heat registers, stoves, or other appliances (including amplifiers) that produce heat.
  • Power Source: The appliance should be connected to a power supply only of the type described in the operating instructions or as marked on the appliance.
  • Grounding or Polarization: Precautions should be taken so that the grounding or polarization means of an appliance is not defeated.
  • Power-Cord Protection: Power supply cords should be routed so that they are not likely to be walked on or pinched by items placed upon or against them, paying particular attention to cords and plugs, convenience receptacles, and the point where they exit from the appliance.
  • Cleaning: The appliance should be cleaned only as recommended by the manufacturer.
  • Non-use Periods: The power cord of the appliance should be unplugged from the outlet when left unused for a long period of time.
  • Object and Liquid Entry: Care should be taken so that objects do not fall and liquids are not spilled into the enclosure through openings.
  • Damage Requiring Service: The appliance should be serviced by qualified service personnel when:
    • the power supply cord or the plug has been damaged; or
    • objects have fallen, or liquid has been spilled into the appliance; or
    • the appliance has been exposed to rain; or
    • the appliance does not appear to operate normally or exhibits a marked change in performance; or
    • the appliance has been dropped, or the enclosure damaged.
  • Servicing: The user should not attempt to service the appliance beyond that which is described in the Operating Instructions. All other servicing should be referred to qualified service personnel.

Channel Control Section

This section details the controls for each input channel.

  1. MIC Input Jacks

    Balanced XLR-type microphone input jacks (1: Ground; 2: Hot; 3: Cold).

  2. LINE Input Jacks (TRS)

    Balanced TRS phone-jack line inputs (T: Hot; R: Cold; S: Ground). You can connect either balanced or unbalanced phone plugs to these jacks.

  3. LINE Input Jacks (Unbalanced)

    Unbalanced phone-jack stereo line inputs.

  4. INSERT Jacks

    Each jack provides an insert point between the equalizer and fader of the corresponding input channel. Use to independently connect devices like graphic equalizers, compressors, or noise filters. These are TRS (tip, ring, sleeve) phone jacks carrying both send and return signals (tip = send/out; ring = return/in; sleeve = ground).

  5. GAIN Control

    Adjusts the input signal level. Adjust so the CLIP indicator lights only occasionally and briefly on the highest input transients for the best balance between S/N ratio and dynamic range.

  6. Equalizer (HIGH, MID, and LOW)

    This three-band equalizer adjusts the channel's high, mid, and low frequency bands. The '0' position provides a flat response. Turning right boosts, turning left attenuates. The following table shows EQ details:

    Band Frequency Cut/Boost
    HIGH 12kHz ±15dB
    MID 2.5kHz ±15dB
    LOW 80Hz ±15dB
  7. AUX Control

    Adjusts the level of the signal sent from the channel to the AUX bus.

  8. EFFECT Controls

    Adjusts the level of the signal sent from the channel to the EFFECT bus. Note that the channel fader also affects this level.

  9. PEAK Indicator

    Detects the peak level of the post-EQ signal. Lights red when the level reaches 3 dB below clipping.

  10. PAN Control

    Determines the stereo positioning of the channel signal on the Main L and R buses.

  11. Channel Fader

    Adjusts the level of the channel signal. Use these faders to balance the levels between channels.

Effect and Master Control Section

  1. DELAY Control

    Adjusts the effect speed.

  2. REP Control

    Adjusts the effect depth.

  3. AUX Control

    Adjusts the level of the signals sent to the AUX bus.

  4. EFFECT RTN Fader

    Adjusts the signal level sent from the internal digital effect unit to the MAIN bus.

  5. PHANTOM +48 V Switch

    Toggles phantom power on and off. When ON, the mixer supplies +48V phantom power to all channels with XLR mic input jacks. Turn ON when using one or more phantom-powered condenser microphones.

  6. POWER Indicator

    Lights when the mixer's power is ON.

  7. Level Meter

    LED meter displaying the level of the MAIN OUT signal. The "0" segment corresponds to the nominal output level. The CLIP segment lights red when the output reaches clipping level.

  8. PHONES Control

    Controls the level of the signal output to the PHONES jack.

  9. MAIN OUT Master Fader

    Adjusts the signal level sent to the MAIN OUT jacks.

MP3 Player and Rear Input/Output Section

  1. USB MP3 PLAYER

    • INDICATOR: Normal flashing indicates all songs cycle; quick flashing indicates single cycle.
    • USB JACK: To insert an external USB disk.
    • Play/Pause Control: [▶️] Play/Pause control button.
    • Previous / Volume - Control: Press once for the previous song; press and hold for a few seconds to turn down the volume.
    • Next / Volume + Control: Press once for the next song; press and hold for a few seconds to turn up the volume.
  2. SEND Jacks

    • MON: Impedance balanced phone-jack output for the MON bus. Use for connecting to effect units, cue boxes, or other monitoring systems.
    • FX: Impedance balanced phone-jack output for the FX bus. Use for connecting to external effect units.
  3. PHONES Jack

    Connect a pair of headphones to this stereo phone jack.

  4. TAPE OUT Jacks

    RCA pin jacks connectable to an external recorder (e.g., MD recorder) to record the same signal output via the MAIN OUT jacks.

  5. MAIN OUT Jacks

    Deliver the mixer's stereo output. Connect to power amplifiers for main speakers, or to recording devices to record the stereo output while using the MAIN OUT Master fader for level control.

  6. POWER Switch

    Use this switch to turn the mixer's power ON or OFF. [CAUTION] Note that a small current continues to flow while the switch is in the OFF position. If you do not plan to use the mixer for a while, be sure to unplug the AC adaptor from the outlet.

  7. AC ADAPTOR IN Connector

    Connect the supplied power adaptor to this connector. [CAUTION] Use only the adaptor included with this mixer. Use of a different adaptor may result in fire or electric shock.

Diagrams and Connections

Mixer Layout Diagram

The mixer features numbered controls corresponding to the sections above. Key connectors visible include XLR mic inputs, 1/4" line inputs, INSERT jacks, USB port, headphone jack, RCA tape outputs, MAIN OUTPUT jacks, and AC power input.

Audio Connections

1/4" Jack Plugs

  • Unbalanced Mono 1/4" Jack: Tip = Signal, Sleeve = Ground/Shield.
  • Balanced Stereo 1/4" Jack: Tip = Hot (+ve), Ring = Cold (-ve), Sleeve = Ground/Shield. For connecting balanced and unbalanced plugs, the ring and sleeve must be bridged on the stereo plug.

XLR Connectors

  • Balanced XLR: Pin 1 = Ground/Shield, Pin 2 = Hot (+ve), Pin 3 = Cold (-ve). For unbalanced use, pins 1 and 3 must be bridged.

Insert Send & Return (TRS)

  • Tip = Send (out)
  • Ring = Return (in)
  • Sleeve = Ground/Shield
  • Connect the insert send with the input and the insert return with the output of the effects device.

Headphones 1/4" Connector (TRS)

  • Tip = Left Signal
  • Ring = Right Signal
  • Sleeve = Ground/Shield

Specifications

INPUT CHANNELS 1 THROUGH 7

Parameter Mic Input Line Input
Frequency Response 10 Hz to 200kHz 10 Hz to 130 kHz
Gain Range +14 dB to +60 dB -6 dB to +38 dB
SNR 120 dB E.I.N. 95 dB E.I.N.

STEREO CHANNELS

Parameter Value
Frequency Response 10 Hz to 70 kHz
Gain Range -8 to +15 dB
SNR 96 dB

EQUALIZATION

Band Frequency Cut/Boost
LOW 80 Hz +/-15 dB
MID 2.5kHz +/-15 dB
HI 12 kHz +/-15 dB

MAIN MIX

Output Level
Main Outputs +22 dBu unbalanced
AUX Send +22 dBu unbalanced
Tape Out +22 dBu unbalanced
Phones Output +15 dBu/150

PHYSICAL

Category Details
Dimensions (D x W x H) mm 4 channel: 210 X 250 X 38
7 channel: 330 X 250 X 38
Weight 4 channel: 1.5Kg
7 channel: 3.2Kg

Power Requirements

  • USA/Canada: 120 V~, 60 Hz
  • U.K./Australia: 240 V~, 50 Hz
  • Europe: 230 V~, 50 Hz
  • Japan: 100 V~, 50-60 Hz
  • China: 220 V~, 50-60 Hz
Models: K7 Bluetooth Portable Audio Mixer, K7, Bluetooth Portable Audio Mixer, Portable Audio Mixer, Audio Mixer
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