1. Introduction
This manual provides detailed instructions for the proper setup, operation, and maintenance of your PROEL Mi12 12-Channel Mixer with Effect. Please read this manual thoroughly before operating the unit to ensure safe and efficient use. The Mi12 is a compact 12-channel, 2-bus mixer designed for various audio applications, featuring an integrated effects processor.
2. Safety Instructions
- Power Supply: Use only the specified power adapter. Ensure the voltage matches your local power supply.
- Water and Moisture: Do not expose this appliance to rain or moisture. Do not place objects filled with liquids, such as vases, on the apparatus.
- Ventilation: Ensure adequate ventilation. Do not block ventilation openings.
- Heat: Do not place near heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
- Cleaning: Clean only with a dry cloth.
- Servicing: Do not attempt to service this product yourself. Refer all servicing to qualified service personnel.
- Grounding: Do not defeat the safety purpose of the polarized or grounding-type plug.
3. Package Contents
Please check that your package contains the following items:
- PROEL Mi12 12-Channel Mixer
- Power Adapter
- User Manual (this document)
4. Product Overview
The PROEL Mi12 is a versatile 12-channel mixer featuring a compact design and a comprehensive set of controls for various audio mixing tasks. It includes multiple input types, a 3-band EQ on mono channels, two auxiliary sends, and a built-in digital effects processor.
Figure 4.1: Top view of the PROEL Mi12 mixer, illustrating the layout of all channels, controls, and the master section. This image provides a comprehensive look at the user interface, including input gains, EQ sections, auxiliary sends, pan controls, channel faders, the effects processor, and the main mix controls.
The mixer's top panel (Figure 4.1) is divided into several sections:
- Input Channels: Channels 1-4 feature XLR microphone inputs and 1/4" line inputs. Channels 5/6, 7/8, 9/10, and 11/12 are stereo line inputs.
- EQ Section: Each mono channel (1-4) includes a 3-band equalizer (HIGH, MID, LOW).
- Auxiliary Sends: Two auxiliary sends (AUX 1 PRE, AUX 2 POST) per channel for monitoring or external effects.
- Effects Processor (PROFX): A dedicated section with 256 digital effects, including reverbs, delays, and chorus.
- Master Section: Controls for the main mix output, control room output, headphone output, and level meters.
5. Setup
Follow these steps to set up your PROEL Mi12 mixer:
Figure 5.1: Rear panel of the PROEL Mi12 mixer, highlighting the power input (18V) and the main power switch. This view is crucial for initial power connection and understanding the mixer's physical interface.
5.1 Power Connection
- Ensure the mixer's power switch (Figure 5.1) is in the OFF position.
- Connect the supplied power adapter to the 18V DC input on the rear panel of the mixer.
- Plug the power adapter into a suitable AC power outlet.
- Turn the power switch to the ON position. The power indicator LED on the front panel should illuminate.
5.2 Audio Input Connections
- Microphones (Channels 1-4): Connect microphones using balanced XLR-F cables to the MIC inputs. If using condenser microphones, activate the +48V Phantom Power switch located in the master section.
- Line Inputs (Channels 1-4): Connect line-level instruments or devices (e.g., keyboards, guitars with preamps) using balanced 1/4" JACK cables to the LINE inputs.
- Stereo Line Inputs (Channels 5/6, 7/8, 9/10, 11/12): Connect stereo line-level sources (e.g., media players, synthesizers) using 1/4" JACK cables. Use both LEFT and RIGHT inputs for stereo, or only the LEFT input for mono operation.
5.3 Audio Output Connections
- Main Mix Output: Connect the MAIN MIX LEFT and RIGHT outputs (1/4" JACK) to your power amplifier, powered speakers, or recording device.
- Control Room Output: Connect C.ROOM LEFT and RIGHT outputs (1/4" JACK) to your studio monitors.
- Headphone Output: Connect your headphones to the PHONES output (1/4" JACK).
6. Operating Instructions
6.1 Input Channels (1-12)
- GAIN: Adjusts the input sensitivity for the connected microphone or line source. Set this so the PEAK LED flashes only occasionally during the loudest parts of the signal.
- LO CUT (Channels 1-4): Activates a 75 Hz high-pass filter to remove unwanted low-frequency rumble.
- EQ (HIGH, MID, LOW - Channels 1-4): These knobs adjust the treble (12 kHz), midrange (2.5 kHz), and bass (80 Hz) frequencies of the input signal. Use them to shape the tone of your instrument or vocal.
- AUX 1 PRE: Sends a portion of the channel signal to the AUX 1 output, independent of the channel fader. Typically used for monitor mixes.
- AUX 2 POST / FX: Sends a portion of the channel signal to the AUX 2 output and the internal effects processor, after the channel fader. Typically used for effects sends.
- PAN (Mono Channels) / BAL (Stereo Channels): Adjusts the position of the channel signal within the stereo field (left to right).
- PEAK LED: Illuminates when the input signal is too high, indicating potential clipping. Reduce the GAIN if this LED lights up frequently.
- Channel Fader/Level: Controls the overall volume of the channel sent to the main mix.
6.2 Effects Processor (PROFX)
The Mi12 features a digital effects processor with 256 effects (16 presets x 16 variations).
- PRESETS: Turn this knob to select one of the 16 effect types (e.g., Hall, Room, Vocal, Plate Reverbs, Delays, Chorus).
- VARIATION: Turn this knob to select one of the 16 variations for the chosen effect preset.
- FX TO AUX 1: Controls the amount of the effect signal sent to the AUX 1 output.
- FX TO MAIN: Controls the amount of the effect signal sent to the main stereo mix.
- TAP: Press this button to set the tempo for delay effects.
6.3 Master Section
- MAIN MIX Fader: Controls the overall output volume of the main stereo mix.
- MAIN MIX Meters: LED meters display the output level of the main mix. Aim for levels around 0 dB during normal operation, avoiding consistent red (clip) indications.
- C.ROOM / PHONES Level: Adjusts the volume for the Control Room outputs and the Headphone output.
- PHANTOM ON/OFF: Activates or deactivates +48V phantom power for condenser microphones connected to XLR inputs. Ensure this is OFF before connecting/disconnecting microphones.
7. Maintenance
- Cleaning: Disconnect the mixer from power before cleaning. Use a soft, dry cloth to wipe the surface. Do not use liquid cleaners or solvents.
- Storage: When not in use for extended periods, store the mixer in a cool, dry place, away from direct sunlight and extreme temperatures.
- Dust Protection: Cover the mixer with a dust cover when not in use to prevent dust accumulation on controls and connectors.
8. Troubleshooting
- No Sound Output:
- Check all power connections and ensure the mixer is turned ON.
- Verify that the MAIN MIX fader is up and not muted.
- Check individual channel faders and GAIN controls.
- Ensure output cables are correctly connected to your amplifier/speakers and that they are powered on.
- Distorted Sound:
- Reduce the GAIN control on the input channel if the PEAK LED is constantly lit.
- Lower the channel fader or MAIN MIX fader if the main meters are consistently in the red.
- Check for faulty cables or connections.
- Effects Not Working:
- Ensure the AUX 2 POST / FX knob on the desired channel is turned up.
- Check the FX TO MAIN knob in the effects section.
- Verify that an effect preset and variation are selected.
9. Specifications
| Feature | Specification |
|---|---|
| Model Number | Mi12 |
| Number of Channels | 12 |
| Input Connectors (Mic) | Balanced XLR-F |
| Input Connectors (Line) | Balanced Jack |
| Mic Input Sensitivity | From -10 to -50 dB |
| Mono Line Input Sensitivity | From +20 to -40 dB |
| Stereo Line Input Sensitivity | +4 / -10 dB |
| Effects Processor | 256 effects (16 presets x 16 variations): Hall, Room, Vocal, Plate Reverbs, Stereo/Mono Tap Delay, Rev + Delay, Rev + Tap Delay, Rev + Chorus |
| Connectivity Technology | Auxiliary, USB (Note: USB functionality not detailed in product description, assume for general connectivity) |
| Power Source | Corded Electric (18V DC) |
| Item Weight | 3.18 Kilograms |
| Product Dimensions | 32 x 25 x 8 cm |
| Manufacturer | Proel |
10. Warranty and Support
PROEL products are designed and manufactured to the highest quality standards. For information regarding warranty terms and conditions, please refer to the warranty card included with your product or visit the official PROEL website. For technical support or service inquiries, please contact your authorized PROEL dealer or distributor.
