MIDAS DM12 12-Input Analogue Live Performance and Studio Mixer User Manual

1. Introduction

This manual provides essential information for the safe and effective use of your MIDAS DM12 12-Input Analogue Live Performance and Studio Mixer. The DM12 is designed for both live sound reinforcement and studio recording applications, featuring award-winning MIDAS microphone preamplifiers.

Key features include:

• 12 input channels for versatile audio mixing.
• 8 mono input channels equipped with high-quality MIDAS microphone preamplifiers.
• 2 electronically-balanced stereo line input channels utilizing 1/4" TRS connectors.
• 3-band EQ on mono channels with a swept mid-band for precise tonal shaping.
• 2 auxiliary sends with pre/post fader switching for flexible monitoring and effects routing.

2. Important Safety Instructions

Please read and follow all safety instructions to prevent electric shock, fire, or injury.

• Risk of Electric Shock: Do not open the mixer enclosure. There are no user-serviceable parts inside. Refer all servicing to qualified service personnel.
• Grounding: This appliance must be grounded/earthed. Ensure proper grounding to prevent electric shock.
• Power Source: Connect the mixer only to the specified voltage and frequency (100-240V~, 50/60Hz, 40W).
• Water and Moisture: Do not expose this appliance to rain or moisture. Do not use near water.
• Ventilation: Ensure adequate ventilation. Do not block any ventilation openings.
• Heat: Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
• Cables: Protect the power cord from being walked on or pinched, particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.

Figure 2.1: Bottom label with safety warnings and compliance details.

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

3. Product Overview

The MIDAS DM12 mixer features a robust design with intuitive controls for efficient audio management. The front panel provides access to all input channels, equalization, auxiliary sends, and master controls.

Figure 3.1: Front panel overview of the MIDAS DM12 mixer.

3.1. Input Channels (1-8 Mono, 9/10 & 11/12 Stereo)

Each mono input channel (1-8) includes an XLR microphone input, a 1/4" TRS line input, an insert point, gain control, 3-band EQ with swept mid, two auxiliary sends, pan control, mute, PFL (Pre-Fader Listen), and a channel fader. Stereo input channels (9/10 and 11/12) feature 1/4" TRS line inputs, gain control, 2-band EQ, two auxiliary sends, balance control, mute, PFL, and a channel fader.

3.2. Master Section

The master section includes controls for main output levels, monitor output, headphone output, 2-track input/output, and auxiliary master sends. Phantom power (+48V) for condenser microphones is also controlled from this section.

Figure 3.2: Aux Masters section with pre/post fader switching.

Figure 3.3: Channel faders for level control.

4. Setup

Proper setup ensures optimal performance and safety of your DM12 mixer.

4.1. Power Connection

1. Ensure the mixer's power switch is in the OFF position.
2. Connect the supplied AC power cord to the mixer's power inlet and then to a grounded electrical outlet. The mixer operates on 100-240V~, 50/60Hz.
3. The mixer is designed and engineered in England.

Figure 4.1: Rear panel showing power connection and other ports.

4.2. Input Connections

• Microphones: Connect microphones to the XLR inputs on channels 1-8. If using condenser microphones, activate the +48V phantom power switch in the master section.
• Line Level Devices: Connect instruments, keyboards, or other line-level devices to the 1/4" TRS line inputs on channels 1-12.
• 2-Track Input: Use the RCA inputs for connecting playback devices like CD players or media players.

4.3. Output Connections

• Main Output: Connect the main XLR outputs to your power amplifier or powered speakers.
• Monitor Output: Connect the 1/4" TRS monitor outputs to your stage monitors or control room speakers.
• Aux Outputs: Use the 1/4" TRS aux outputs for sending signals to external effects processors or additional monitor mixes.
• Headphones: Connect headphones to the 1/4" TRS headphone jack for personal monitoring.
• Record Out: Use the RCA outputs to connect to a recording device.

5. Operating the Mixer

This section outlines the basic operation of the MIDAS DM12 mixer.

5.1. Powering On/Off

1. Before powering on, ensure all channel faders and the main mix fader are at their lowest setting.
2. Turn on any connected source devices (microphones, instruments).
3. Flip the power switch on the rear panel to the ON position.
4. Turn on your power amplifiers or powered speakers last.
5. To power off, reverse the sequence: turn off amplifiers/powered speakers first, then the mixer, then source devices.

5.2. Channel Operation

• Gain Control: Adjust the GAIN knob for each channel to achieve an optimal input level. The PEAK LED should flash only occasionally.
• Equalization (EQ): Use the TREBLE, MID (with FREQ sweep), and BASS knobs to shape the tone of each channel.
• Aux Sends: Adjust the AUX 1 and AUX 2 knobs to send a portion of the channel signal to the auxiliary outputs. Use the PRE/POST switches in the master section to determine if the aux send is affected by the channel fader (POST) or not (PRE).
• Pan/Balance: Use the PAN knob (mono channels) or BAL knob (stereo channels) to position the signal within the stereo field.
• Mute: Press the MUTE button to silence a channel.
• PFL (Pre-Fader Listen): Press the PFL button to monitor the channel's signal before the fader, typically through headphones.
• Channel Fader: Adjust the channel fader to control the level of the signal sent to the main mix.

5.3. Master Controls

• Main Mix Fader: Controls the overall output level of the main stereo mix.
• Aux Masters: Adjust the AUX 1 and AUX 2 master knobs to control the overall level of the auxiliary sends.
• Monitor/Phones: Adjust the MONITOR and PHONES level knobs to control the output level to your monitor speakers and headphones, respectively.
• 2-Track Level: Controls the playback level of the 2-track input.

6. Maintenance

Regular maintenance helps prolong the life and performance of your DM12 mixer.

• Cleaning: Use a soft, dry cloth to clean the exterior of the mixer. Do not use abrasive cleaners or solvents.
• Dust: Keep the mixer free from dust. Use a soft brush or compressed air to clean around knobs and faders.
• Storage: When not in use for extended periods, store the mixer in a cool, dry place, preferably covered to protect it from dust.
• Fuses: If the mixer does not power on, check the fuse located near the power inlet on the rear panel. Replace with a fuse of the same type and rating (T 1.6 A H 250V).

7. Troubleshooting

This section provides solutions to common issues you might encounter.

• No Sound Output:
  • Check all power connections and ensure the mixer is turned on.
  • Verify that the main mix fader and individual channel faders are raised.
  • Ensure no MUTE buttons are engaged on channels or master outputs.
  • Check connections to your power amplifier or powered speakers.
  • Confirm input sources are active and connected correctly.
• No Signal from a Specific Channel:
  • Check the input cable connection for that channel.
  • Adjust the channel's GAIN knob.
  • Ensure the channel's MUTE button is not engaged.
  • If using a condenser microphone, verify +48V phantom power is active.
• Hum or Noise:
  • Ensure all equipment is properly grounded.
  • Check for faulty cables or connections.
  • Reduce gain levels if distortion occurs.
  • Separate audio cables from power cables to minimize interference.
• Distorted Sound:
  • Reduce the GAIN on the input channel.
  • Check that the PEAK LED on the channel is not constantly lit.
  • Lower the main mix fader or the input level to your amplifier.

If you continue to experience issues, please contact MIDAS customer support.

8. Specifications

9. Warranty

MIDAS products are designed and manufactured to the highest standards. For detailed warranty information, please refer to the warranty card included with your product or visit the official MIDAS website. Keep your proof of purchase for warranty claims.

10. Support

For technical support, service, or further inquiries regarding your MIDAS DM12 mixer, please visit the official MIDAS website or contact their customer service department. Contact information can typically be found on the manufacturer's website or in the product packaging.