ARVOMIC 4-Channel Audio Mixer (ARMX-4) User Manual

1. Introduction

Thank you for choosing the ARVOMIC 4-Channel Audio Mixer (ARMX-4). This professional mixing console is designed to provide high-quality audio processing for various applications, including small stages, home studios, gigs, and DJ parties. It features a compact design, robust construction, and a comprehensive set of functions to meet your audio mixing needs. Please read this manual thoroughly before operating the device to ensure proper use and to maximize its performance and longevity.

2. Safety Information

To prevent electric shock, fire, or damage to the unit, please observe the following safety precautions:

• Do not expose this unit to rain or moisture.
• Do not remove the cover. There are no user-serviceable parts inside. Refer all servicing to qualified personnel.
• Ensure the power supply voltage matches the requirements specified on the unit.
• Protect the power cord from being walked on or pinched, particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.
• Unplug the unit during lightning storms or when unused for long periods.
• Avoid placing the unit near heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
• Do not block any ventilation openings. Install in accordance with the manufacturer's instructions.

3. Package Contents

Please check that all items are included in the package:

• ARVOMIC 4-Channel Audio Mixer (ARMX-4)
• Power Adapter
• User Manual (this document)

If any items are missing or damaged, please contact your retailer.

4. Product Features

• 4-Channel Mixing Console: Compact design with professional mixing capabilities.
• Low-Noise Preamps: Professional and discrete mic preamps with 2 mono XLR and 1/4" LINE connected jacks, plus stereo input jacks.
• +48V Phantom Power: Enables safe charging and use of condenser microphones.
• 3-Band EQ: Musical 3-band equalizer on each channel for detailed sound character adjustment.
• 16 DSP Digital Effects: Built-in effects for dynamic and personalized mixes.
• USB/Flash/MP3 Reader: Allows streaming music and recording to a USB stick or computer.
• Bluetooth Functionality: Wirelessly stream music from smartphones and other devices. (Note: USB and Bluetooth functions cannot be used simultaneously.)
• FX Output Jack: Connect external compressors, equalizers, or processors for additional audio processing.
• Precise Level Control: Well-designed faders and knobs for accurate level/volume adjustments.
• Sturdy Construction: Elegant design with a white control board and durable metal construction.

5. Controls and Functions

Familiarize yourself with the various controls and connections on your ARMX-4 mixer.

Figure 5.1: Front Panel Overview of the ARMX-4 Mixer with key controls labeled.

5.1 Input Channels (Channels 1-4)

• MIC / LINE Input (XLR/1/4" Combo Jack): Connect microphones (XLR) or line-level instruments (1/4" TS/TRS). Channels 1 and 2 feature combo jacks. Channels 3/4 are stereo 1/4" LINE inputs.
• PAD Button (26dB): Attenuates the input signal by 26dB for very loud sources.
• HPF Button (80Hz): Activates a High-Pass Filter at 80Hz to reduce unwanted low-frequency rumble.
• GAIN Knob: Adjusts the input sensitivity for each channel. Set this to achieve a strong signal without clipping.
• 3-Band EQ (HIGH, MID, LOW):
  • HIGH: Adjusts treble frequencies (10kHz).
  • MID: Adjusts mid-range frequencies (2.5kHz).
  • LOW: Adjusts bass frequencies (100Hz).
• FX Knob: Controls the amount of signal sent from the channel to the internal DSP effects processor.
• PEAK LED: Illuminates when the input signal is too high, indicating potential clipping. Adjust GAIN down if this LED lights up frequently.
• LEVEL Knob: Adjusts the overall output level of the individual channel to the main mix.

5.2 Master Section

• FX SEND Jack: Output for sending signal to an external effects processor.
• PHONES Jack: 1/4" stereo output for connecting headphones.
• STEREO OUT (L/R) Jacks: XLR outputs for connecting to a power amplifier, powered speakers, or recording device.
• USB TO PC / Bluetooth Interface: Allows connection to a computer for audio interface functionality or wireless Bluetooth streaming.
• Digital Display: Shows current DSP effect number or USB/Bluetooth status.
• PREV/NEXT/P/P/MODE Buttons: Control USB/Bluetooth playback and DSP effect selection.
• 16 DSP Effects Knob (PROGRAM): Selects one of the 16 built-in digital effects.
• PARAMETER Knob: Adjusts a specific parameter of the selected DSP effect (e.g., delay time, reverb decay).
• MAIN METERS (LED): Displays the main stereo output level. Aim for levels around 0dB to avoid clipping.
• PHANTOM (+48V) Button: Activates phantom power for condenser microphones connected to XLR inputs.
• MAIN Fader: Controls the overall output volume of the main stereo mix.
• PHONES Level Knob: Adjusts the volume of the headphone output.
• STEREO Fader: Controls the level of the USB/Bluetooth/MP3 input.

6. Setup Guide

Follow these steps to set up your ARMX-4 mixer:

1. Placement: Place the mixer on a stable, flat surface, ensuring adequate ventilation around the unit.
2. Power Connection: Ensure the mixer's power switch is OFF. Connect the provided power adapter to the DC IN jack on the rear panel of the mixer, then plug the adapter into a suitable AC power outlet.
3. Output Connections: Connect the STEREO OUT (L/R) XLR jacks to your power amplifier, powered speakers, or recording interface.
4. Input Connections:
   • Microphones: Connect microphones to the MIC/LINE XLR inputs (Channels 1-2). If using condenser microphones, activate the +48V PHANTOM power.
   • Line-Level Instruments: Connect instruments like keyboards or guitars (with a DI box) to the 1/4" LINE inputs.
   • Stereo Sources: Connect stereo devices (e.g., CD player, external audio interface) to the 1/4" LINE inputs of Channel 3/4.
5. Headphones: Connect your headphones to the PHONES jack for monitoring.
6. Initial Settings: Before powering on, ensure all GAIN knobs are at their minimum, and all LEVEL faders/knobs (including MAIN and PHONES) are at their minimum.
7. Power On: Turn on the mixer's power switch. Then, turn on your connected amplifier or powered speakers.

7. Operating Instructions

7.1 Basic Mixing

1. Set Input Gain: While the source is playing (e.g., speaking into a microphone), slowly increase the GAIN knob for that channel until the PEAK LED flashes only occasionally. This ensures a strong signal without distortion.
2. Adjust Channel Level: Slowly raise the channel's LEVEL knob to bring the sound into the main mix.
3. Adjust Main Output: Gradually raise the MAIN fader to achieve the desired overall volume from your speakers. Monitor the MAIN METERS to ensure levels stay below clipping (0dB).
4. Use EQ: Adjust the HIGH, MID, and LOW EQ knobs on each channel to shape the tone of the sound.
5. Monitor with Headphones: Adjust the PHONES Level knob to set your headphone volume.

7.2 DSP Effects

Figure 7.1: Close-up of the DSP Effects section, showing the program display and control knobs.

The ARMX-4 features 16 built-in DSP effects:

1. Select Effect: Turn the PROGRAM knob to cycle through the 16 effects. The selected effect number will be shown on the digital display.
2. Adjust Effect Parameter: Use the PARAMETER knob to fine-tune the selected effect. For example, on a delay effect, this might adjust the delay time.
3. Apply to Channels: Use the FX knob on each individual channel to send a portion of that channel's signal to the DSP effects processor.
4. Adjust Overall FX Level: The overall level of the effects return is controlled by the dedicated FX return level (often integrated with the main stereo fader or a separate knob, depending on the specific model variant).

7.3 USB & Bluetooth Functionality

Figure 7.2: The USB and Bluetooth interface, showing connectivity options and controls.

The mixer supports USB/flash drive playback/recording and Bluetooth streaming. Note: USB and Bluetooth functions cannot be used simultaneously.

• USB Playback/Recording: Insert a USB flash drive into the USB port. Use the PREV/NEXT/P/P/MODE buttons to navigate and control playback. The mixer can also record directly to the USB drive. When connected to a PC via USB, the mixer acts as an audio interface for recording and playback.
• Bluetooth Streaming: Press the MODE button until the display shows "BLUE" or a Bluetooth icon. On your smartphone or Bluetooth-enabled device, search for "ARMX-4" (or similar name) and pair. Once connected, you can stream audio wirelessly to the mixer. Use the built-in controls (PREV/NEXT/P/P) to play/pause/skip tracks.
• Adjust USB/Bluetooth Level: Use the STEREO fader/knob to control the volume of the USB/Bluetooth input in the main mix.

8. Maintenance

• Cleaning: Use a soft, dry cloth to clean the exterior of the mixer. Do not use liquid cleaners or aerosols, as they may damage the finish or internal components.
• Storage: When not in use, store the mixer in a cool, dry place away from direct sunlight and extreme temperatures.
• Ventilation: Ensure that the ventilation openings are not blocked to prevent overheating.
• Cable Management: Avoid bending or crimping cables excessively, especially the power cord.

9. Troubleshooting

10. Specifications

Figure 10.1: Dimensions of the ARMX-4 Mixer (approx. 19.2 cm x 16.3 cm x 4.5 cm).

11. Warranty and Support

This product is covered by a standard manufacturer's warranty. For specific warranty terms and conditions, please refer to the documentation provided with your purchase or contact your retailer. For technical support, troubleshooting assistance, or inquiries about replacement parts, please contact the customer service department of your retailer or the manufacturer directly.