1. Introduction
The LOMEHO AM-GT6 is a versatile 6-channel audio mixer designed for professional sound mixing applications. It features individual 48V phantom power, a 24-bit DSP effects processor with 99 effects, USB playback and recording capabilities, Bluetooth connectivity, and a 7-band graphic equalizer on the main output. This manual provides detailed instructions for setup, operation, and maintenance to help you get the most out of your device.
2. 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.
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.
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 the 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.
3. Product Features
- 6 Mono Channels: For individual microphone or line-level inputs.
- Channel 3-Band EQ: Each channel features High, Mid, and Low equalization.
- Main Output 7-Band EQ: Provides precise frequency control for the overall mix.
- Individual 48V Phantom Power: Supplies power to condenser microphones on each XLR input.
- 24 Bit 99 DSP Effects: Built-in digital effects processor with a wide range of reverbs, delays, and other effects.
- USB Play & Record: Allows direct playback from a USB disk and recording of the main mix to a USB disk.
- Bluetooth Function: Seamlessly connect and stream audio from Bluetooth-enabled devices.
- 2 AUX Outputs: For connecting external effects processors, monitor speakers, or other devices.
- DC 12V Power Supply: Efficient and reliable power source.
4. Panel Overview
The LOMEHO AM-GT6 mixer features a comprehensive layout of controls and connectors. Familiarize yourself with the following diagrams and descriptions.
Front Panel Controls and Connectors:
- LINE IN/MIC Inputs (1-6): Balanced XLR and 1/4" jack inputs for microphones and line-level devices.
- 48V PHANTOM Button: Activates +48V phantom power for condenser microphones on the respective XLR input.
- GAIN Knob: Adjusts the input gain for each channel.
- HIGH EQ Knob: Controls the high-frequency equalization for each channel.
- MID EQ Knob: Controls the mid-frequency equalization for each channel.
- LOW EQ Knob: Controls the low-frequency equalization for each channel.
- AUX1 Knob: Adjusts the send level to AUX1 output.
- AUX2/FX Knob: Adjusts the send level to AUX2 output or internal effects processor.
- PAN Knob: Adjusts the stereo panning for each channel.
- PEAK LED: Indicates when the input signal is clipping.
- CHANNEL Fader: Adjusts the volume level of the corresponding channel.
- USB Socket: For USB disk playback, recording, or connecting to a computer.
- PHONES Jack: 1/4" stereo output for headphones.
- MAIN OUT (L/R) XLR Jacks: Balanced XLR main stereo outputs.
- MAIN OUT (L/R) 1/4" Jacks: Balanced 1/4" main stereo outputs.
- POWER Button: Turns the mixer on/off.
- DSP99-EFFECTS MIXER with USB Display: Digital display for effects, USB/Bluetooth status, and playback information.
- PARAMETER Knob: Selects and adjusts parameters for DSP effects.
- PROGRAM Knob: Selects the DSP effect program.
- FX TO AUX1 Knob: Adjusts the effect send level to AUX1.
- AUX Knob (Master): Adjusts the master volume for AUX outputs.
- PHONES Knob: Adjusts the headphone output volume.
- 7-BAND STEREO GRAPHIC EQUALIZER: Graphic equalizer for the main output.
- MAIN Faders (L/R): Adjusts the master volume for the main stereo outputs.
5. Setup Instructions
5.1 Power Supply
Connect the provided DC 12V power adapter to the mixer's DC IN 12V jack. First, connect the adapter to the mixer, then plug it into an AC outlet. Ensure the power switch is in the OFF position before connecting.
5.2 Microphone Connection (+48V Phantom Power)
Use balanced XLR cables to connect condenser microphones to the XLR inputs (LINE IN/MIC). For dynamic microphones, use either XLR or 1/4" LINE IN inputs.
5.3 AUX Output Connection
The AUX outputs can be used to connect external devices such as equalizers, effects processors, or monitor speakers. Use 1/4" TS cables for these connections.
5.4 USB Disk Formatting and Connection
Ensure your USB disk is formatted to FAT32. NTFS format is not supported. Insert the USB disk into the USB socket on the mixer.
5.5 Bluetooth Connection
To connect a Bluetooth device, ensure the mixer is in Bluetooth mode (display shows "BLUE"). If not, long press the "MODE" button to enter Bluetooth waiting state. Pair your device with the mixer.
5.6 General Connection Diagram
The following diagram illustrates typical connections for various audio sources and outputs.
6. Operating Instructions
6.1 Using 48V Phantom Power
- After connecting a condenser microphone to an XLR input, press the "48V PHANTOM" button for that channel. The LED light will turn on, indicating that 48V phantom power is active.
- Phantom power is independent for each channel.
- Note: 48V phantom power is only supplied to the XLR jack, not the LINE jack.
6.2 Using 24 Bit 99 DSP Effects
- Select Effect: Use the "PARAMETER" knob.
- Rotate the "PARAMETER" knob to the desired effect number. The number on the display will flash.
- Press down the "PARAMETER" knob to select this effect. The number will stop flashing and remain steadily lit.
- Adjust Effect Parameters: Use the "PROGRAM" knob to fine-tune the selected effect's parameters (e.g., depth, speed).
- Effect Output:
- Rotate the channel's "FX" knob to adjust the effect volume for that channel's output.
- Rotate the master "EFFECT" knob to adjust the overall effect volume sent to the main output.
- FX to AUX1: The "FX TO AUX1" knob adjusts the effect volume sent to AUX1. Adjust the channel "FX" knob and the "FX TO AUX1" knob (no need to adjust the master "EFFECT" knob).
6.3 Adjusting Headphone Volume
- Adjust the "MAIN" volume fader to set the overall output level.
- Then, adjust the "PHONES" knob to control the headphone volume.
- Note: The headphones will monitor the same sound as the main output.
6.4 Using Bluetooth Function
- Select Bluetooth Status:
- The system defaults to "BLUE" state.
- If not in "BLUE" state, long press the "MODE" button to enter Bluetooth waiting state. The "Bluetooth symbol" on the screen will flash.
- Upon successful connection, the "Bluetooth symbol" will remain steadily lit.
- Volume Adjustment:
- Press down the "CH-4/USB" button.
- Rotate the "CH-4/USB" knob to adjust the channel volume.
- Adjust the "MAIN" volume fader for overall output.
6.5 USB Playback
- USB Disk Format: Ensure your USB disk is formatted to FAT32 (NTFS will not work).
- Playable Formats: MP3, FLAC, WAV, WMA.
- Adjust Volume:
- Rotate the "CH-4/USB" knob to adjust the channel volume.
- Adjust the "MAIN" volume fader for overall output.
6.6 USB Recording
- Record Format: MP3.
- Recording Sample Frequency: 16 Bit 48KHz.
- The USB disk cannot be empty to initiate recording.
- Long press the "REC" button to enter recording mode.
- Long press "REC" again to exit recording. After exiting, the recorded file will be played automatically.
6.7 Using the GAIN Knob
- When the "MAIN" fader is at the "0" position and the channel volume knob provides sufficient output, there is no need to adjust the "GAIN" knob.
- If the output volume is insufficient, adjust the "GAIN" knob.
- The "PEAK" light should not be constantly on. If it is, the signal is distorted. Reduce the GAIN.
- Adjusting "GAIN" will also increase input noise, so use it judiciously.
6.8 Using the AUX Port
AUX outputs are TS (Tip-Sleeve) outputs, meaning only one side (mono) will have sound if connected to a stereo input.
- Connecting Other Devices:
- Equalizer
- Effects processor
- Monitor headphones (will only work on one side)
- Monitor speakers (will only work on one speaker)
- AUX OUT Volume Adjustment:
- Adjust the channel "AUX1/AUX2" knob.
- Adjust the master control "AUX1/AUX2" knob.
- FX to AUX1: To add effects to AUX1, adjust the channel "FX" knob and the "FX TO AUX1" knob. (The master "EFFECT" knob is not needed for this).
7. Technical Specifications
| Category | Parameter | Value |
|---|---|---|
| Mic Input (Channels 1-5) | Configuration | Electronically balanced, discrete input |
| Frequency Response | 10 Hz to 200 kHz | |
| Gain Range | +14 dB to +60 dB | |
| Line Input | Configuration | Electronically balanced |
| Frequency Response | 10 Hz to 130 kHz | |
| Gain Range | -6 dB to +38 dB | |
| Stereo Channel | Frequency Response | 10 Hz to 70 kHz |
| Gain Range | Line: -8 to +15 dB / Mic: +13 to +60 dB | |
| Equalization | LOW | 50 Hz, +/-15dB |
| MID | 700 Hz, +/-15dB | |
| HI | 10 kHz, +/-15dB | |
| Main Section Outputs | Main Outputs | +28 dBu balanced / +22 dBu unbalanced |
| AUX Send | +22 dBu unbalanced | |
| EFF Send | +22 dBu unbalanced | |
| Tape Out | +22 dBu unbalanced | |
| Phones Output | +15dBu/150 | |
| Physical Dimensions (H x W x D) | 4 channel model | 197 x 250 x 55 mm |
| 7 channel model | 317 x 250 x 55 mm | |
| Weight | 4 channel model | 1.5 kg |
| 7 channel model | 2.35 kg | |
| Built-in Battery | No | |
| High-concerned chemical | None | |
| Type | Mixers | |
| Origin | Mainland China |
8. Troubleshooting
8.1 Bluetooth Connection Issues
Problem: An unknown device is always connected via Bluetooth, or you wish to disconnect/unauthorize a device.
Solution: To disconnect or unpair a device, you typically need to do this from the connected device itself (e.g., your phone or computer). On the mixer, long-pressing the "MODE" button will put it into pairing mode, allowing you to connect a new device, which might override a previous connection. If a device is persistently connected, ensure no other Bluetooth devices in the vicinity are automatically pairing with the mixer.
8.2 Signal Distortion (PEAK LED)
Problem: The PEAK LED on a channel is constantly lit.
Solution: This indicates that the input signal is too strong and causing distortion. Reduce the GAIN knob for that specific channel until the PEAK LED only flashes occasionally or not at all.
8.3 USB Disk Not Working
Problem: USB disk is not recognized or files cannot be played.
Solution: Ensure the USB disk is formatted to FAT32. NTFS format is not supported. Also, verify that the audio files are in a supported format (MP3, FLAC, WAV, WMA).
9. User Tips
- Phantom Power Usage: Remember that 48V phantom power is exclusively for XLR inputs and condenser microphones. Do NOT activate it when using dynamic microphones or LINE inputs to avoid potential damage.
- USB Compatibility: Always format your USB drives to FAT32 for proper functionality. Note that USB microphones are not compatible with the mixer's USB interface.
- Bluetooth Pairing: If you're having trouble connecting via Bluetooth, long-press the "MODE" button on the mixer to ensure it's in pairing mode (the Bluetooth symbol will flash).
- Screen Protection: The display screen may have a protective film; gently peel it off for better visibility.
- Mono AUX Output: Be aware that the AUX outputs are TS (Tip-Sleeve) and will provide a mono signal. If connecting to a stereo input, you will only get sound on one side.
- Gain Staging: Adjust your GAIN knobs carefully. Too much gain can lead to distortion (indicated by the PEAK LED), while too little can result in a weak signal. Aim for a strong signal without clipping.
10. Warranty and Support
10.1 Warranty Information
The manufacturer warrants the mechanical and electronic components of this product to be free of defects in material and workmanship for a period of one (1) year from the original date of purchase. This warranty does not cover defects due to normal wear and tear, improper handling, misuse, neglect, or unauthorized modifications. Any repair or opening of the unit by unauthorized personnel will void the warranty.
Warranty services will be furnished only if the product is accompanied by a copy of the original retail dealer's invoice. Products deemed eligible for repair or replacement under warranty will be serviced within 30 days of receipt.
10.2 Further Support
For additional information, detailed diagrams, or specific troubleshooting not covered in this manual, please refer to the official user manual PDF available online. You can access it via this link: LOMEHO AM-GT6 User Manual (PDF).
