VKTECH MD44 4-Channel Audio Interface

1. Introduction

The VKTECH MD44 is a professional 4-channel audio interface designed for high-quality audio recording, monitoring, and live streaming. Featuring 24-bit/192kHz audio resolution, a loopback function, and 48V phantom power, this portable USB 2.0 sound card is suitable for studio recording, singing, instrument recording, and various audio production needs. It offers versatile input options for microphones and instruments, ensuring clear and accurate sound capture.

2. Key Features

• High-Quality Recording: Achieves studio-level 24-bit/192kHz audio resolution for pristine sound quality, capturing every detail with accuracy. Features low-noise microphone pre-amplifiers for three-dimensional transparency.
• Compatibility: Compatible with popular recording software (e.g., Studio One, Adobe Audition, SAM) and uses universal drivers for Windows, offering flexibility in sound production.
• Loopback Functionality: Mixes all audio signals from various channels with computer audio into two device channels, sending it back to the computer. Provides zero-latency monitoring for clear performance feedback.
• Versatile Input Options: Equipped with 4 preamplifiers and 4 instrument/microphone inputs (combo XLR/6.5mm jacks). Supports high and low impedance input mode switching. Left and right channel inputs reflect spatial positioning.
• Flexible Power Options: Connects directly to PCs or iOS devices via USB 2.0 for both recording and power. Can also be powered by a standard 5V 2A USB power adapter or an external USB mobile power source (not included).
• 48V Phantom Power: Provides 48V phantom power for condenser microphones.
• Reverb Adjustment: Features a self-reverberation adjustment knob (FX Level Knob) for microphone delay trim and simulation of multiple scene effects.
• Monitoring: Real-time headset monitoring with independent volume control for 6.5mm and 3.5mm monitor output connectors.
• Outputs: Analog RL line output and two headphone outputs. Supports stereo/mono output switching.

Overview of key features including HD recording, 48V phantom power, and reverb adjustment.

3. Setup Guide

3.1. Package Contents

Before you begin, please ensure all items are present in the package:

• MD44 Sound Card x 1
• USB Cable x 1
• USB Power Cable (Type-C) x 1
• User Manual x 1

Included accessories with the MD44 Audio Interface.

3.2. Powering the Device

The MD44 audio interface offers flexible power options:

• Via USB 2.0: Connect the provided USB cable from the MD44's PC USB interface to your computer (PC or iOS device). This connection provides both power and data transfer.
• External 5V USB Power: When not connected to a computer, or for stable power supply, use a standard 5V 2A USB power adapter or an external USB mobile power source (not included) connected to the 5V DC input port.

Power supply scenarios for the MD44, including USB and external 5V options.

3.3. Connecting Inputs and Outputs

Refer to the diagrams below for proper connection of your audio equipment.

Front and rear overview of the MD44 Audio Interface.

Front Panel Connections:

• MIC/LINE/XLR Input Connectors (1L, 2R, 3L, 4R): Connect microphones (XLR recommended for optimal sound) or instruments (6.5mm jack for guitar/MIDI keyboard).
• Headphone Jacks: Two outputs for monitor headphones.

Front panel connections for microphones, instruments, and headphones.

Rear Panel Connections:

• PC USB Interface: Connect to your computer for data and power.
• 5V Power Input: For external power supply.
• Accompaniment Input Jack: For external audio input.
• Linear Output Port (LINE OUTPUT): Connect to external speakers or other audio devices.
• Listening Output Port (MONITOR OUT): Connect to studio monitor speakers.

Rear panel connections for PC, speakers, and power.

3.4. Software Installation

The MD44 audio interface uses universal drivers for Windows, meaning no proprietary driver installation is typically required. It is compatible with popular recording software such as Studio One, Adobe Audition, and SAM. Ensure your Digital Audio Workstation (DAW) software is updated and configured to recognize the MD44 as its audio input/output device.

Connection configurations for mobile devices and computers.

4. Operating Instructions

4.1. Front Panel Controls

Detailed view of the MD44 front panel controls.

• Gain Knobs (GAIN 1-4): Adjust the input level for each channel. Monitor the signal indicator lights (SIG) next to each knob to prevent clipping (PK).
• +48V Phantom Power Switches: Activate phantom power for condenser microphones connected to channels 1-2 and 3-4.
• High Impedance Switch (HI-Z): Engages high impedance mode for instruments like electric guitars or basses.
• Low-Cut High-Pass Filters: Reduces unwanted low-frequency noise.
• MIX Knob: Adjusts the balance between direct input signal and playback from your computer.
• MON Button: Activates direct monitoring.
• LOOPBACK Button: Engages the loopback function, mixing all audio signals into two channels for return to the computer.
• FX Level Knob: Adjusts the level of the reverb effect.
• MONITOR Knob: Controls the overall output volume for monitor speakers.
• Headphone Knob: Controls the volume for the headphone outputs.

4.2. Recording and Monitoring

• Input Level Adjustment: Use the GAIN knobs to set appropriate input levels. The SIG indicator lights will illuminate when a signal is present, and the PK (peak) light will indicate if the signal is too hot and clipping. Adjust gain to avoid clipping.
• Phantom Power: For condenser microphones, ensure the +48V switch is engaged. For dynamic microphones, keep it off.
• Instrument Input: When connecting an electric guitar or bass, engage the HI-Z switch for proper impedance matching.
• Direct Monitoring: Press the MON button to enable zero-latency direct monitoring, allowing you to hear your input signal without delay.
• Headphone Monitoring: Connect your headphones to either the 6.5mm or 3.5mm jack and adjust the Headphone Knob for comfortable listening.
• Reverb Effect: Use the FX Level Knob to add and adjust the built-in reverb effect to your input signals.

The MD44 facilitates easy recording for musicians and vocalists.

Independent gain control for each of the four input channels.

5. Maintenance

• Cleaning: Use a soft, dry cloth to clean the exterior of the device. Avoid using liquid cleaners or solvents, as they may damage the finish or internal components.
• Storage: Store the audio interface in a cool, dry place away from direct sunlight and extreme temperatures.
• Cable Care: Handle all cables with care. Avoid bending or twisting them excessively, which can lead to damage.
• Dust Protection: Keep the device free from dust, especially around ports and ventilation openings, to ensure proper operation and longevity.

6. Troubleshooting

6.1. Common Issues and Solutions

• No Sound Output:
  • Check all cable connections (USB, speakers, headphones).
  • Ensure the MD44 is selected as the default audio output device in your computer's sound settings and your DAW.
  • Verify that the MONITOR and Headphone knobs are turned up.
  • Check if the power indicator is on.
• Input Signal Too Low or Distorted:
  • Adjust the GAIN knob for the respective channel.
  • If using a condenser microphone, ensure +48V phantom power is engaged.
  • For microphones, it is recommended to use a Canon head (XLR) input. If using a 6.5mm access for a microphone, the sound may appear too small.
  • If connecting an electric guitar or bass directly to the mixer input, consider using a DI box (Direct Injection box) or guitar speaker between the instrument and the mixer for optimal signal.
  • Ensure the correct impedance setting (HI-Z) is selected for instruments.
• Only One Input Channel Working in DAW:
  • This is often a software configuration issue. Check your DAW's audio settings to ensure all four input channels of the MD44 are enabled and correctly assigned to tracks.
  • Verify that the input monitoring is enabled for the desired tracks in your DAW.
• No Loopback Functionality:
  • Ensure the LOOPBACK button on the front panel is engaged.
  • Check your recording software settings to ensure it is capturing the stereo mix from the MD44.

7. Specifications

8. User Tips

• For the best microphone sound quality, always use the XLR (Canon head) input rather than the 6.5mm jack.
• If you are connecting an electric guitar or bass directly to the interface and experiencing signal issues, consider using a DI (Direct Injection) box to optimize the signal for recording.
• When recording multiple channels in your DAW, double-check your software's input routing settings to ensure each channel of the MD44 is recognized and assigned correctly. This can resolve issues where only one input appears to be working.
• Experiment with the FX Level knob to find the right amount of reverb for your vocals or instruments.

9. Warranty and Support

For warranty information and technical support, please refer to the documentation provided at the time of purchase or contact your retailer. Keep your proof of purchase for any warranty claims.