1. Introduction
This manual provides comprehensive instructions for the Behringer XENYX QX1204USB Premium 12-Input 2/2-Bus Mixer. It covers setup, operation, maintenance, and troubleshooting to ensure optimal performance of your audio interface.
The Behringer XENYX QX1204USB is a premium ultra-low noise, high headroom mixer designed for various audio applications. It features XENYX Mic Preamps, studio-grade compressors, a KLARK TEKNIK Multi-FX Processor, and a USB/Audio Interface.
What's in the Box:
- Premium 12 Input 2/2 Bus Mixer
- Xenyx Mic Preamps & Compressors
- Klark Klark Multi Fx Processor
Figure 1: Front view of the Behringer XENYX QX1204USB Mixer, showcasing its control layout.
2. Key Features
- Premium ultra-low noise, high headroom mixer.
- 4 state-of-the-art, phantom-powered XENYX Mic Preamps comparable to stand-alone boutique preamps.
- 4 studio-grade compressors with super-easy "one-knob" functionality and control LED for professional vocal and instrumental sound.
- Ultra-high quality KLARK TEKNIK FX processor with LCD display, dual-parameters, Tap function and storable user parameter settings.
- "Wireless-ready" for high-quality BEHRINGER digital wireless system (not included).
Figure 2: Illustrates the mixer's capability with XENYX Mic Preamps for clear audio input from microphones and instruments.
Figure 3: Visual representation of audio compression, a key feature of the mixer's studio-grade compressors.
Figure 4: The integrated KLARK TEKNIK FX processor offers high-quality effects for enhanced audio.
3. Setup
3.1 Power Connection
Connect the provided power cable to the mixer's power input and then to a suitable AC outlet. Ensure the power switch is in the 'OFF' position before connecting.
3.2 Audio Input Connections
- Microphones: Use XLR cables to connect microphones to the MIC inputs (channels 1-4). Activate +48V phantom power for condenser microphones using the PHANTOM switch.
- Line-Level Devices: Connect instruments or other line-level audio sources to the LINE IN inputs using 1/4" TRS or TS cables. Stereo channels (5/6, 7/8) can accommodate stereo sources.
- USB/Audio Interface: Connect the mixer to your computer using a USB cable for digital audio input and output.
3.3 Audio Output Connections
- Main Outputs: Connect your main speakers or power amplifier to the MAIN OUTPUTS (XLR or 1/4" TRS).
- ALT 3-4 Outputs: Use these outputs for sub-mixes or alternative monitoring.
- Control Room Out: Connect studio monitors for critical listening.
- Headphones: Plug your headphones into the PHONES jack for personal monitoring.
Figure 5: Rear view of the mixer, showing power input, phantom power switch, main outputs, ALT 3-4 outputs, control room outputs, and USB interface.
4. Operating Instructions
4.1 Channel Controls
- GAIN: Adjusts the input sensitivity for each channel. Set it so the CLIP LED flashes only occasionally.
- EQ (Equalizer): Use the HIGH, MID, and LOW knobs to shape the tone of each channel.
- AUX: Controls the amount of signal sent to the auxiliary sends for external effects or monitor mixes.
- PAN: Adjusts the stereo position of the channel signal.
- MUTE: Silences the channel.
- SOLO: Isolates the channel for monitoring through headphones or control room outputs.
- LEVEL Fader: Controls the overall volume of the channel in the main mix.
4.2 Compressor Usage
The QX1204USB features "one-knob" compressors on channels 1-4. Turn the COMP knob clockwise to increase compression. The LED indicates when compression is active.
4.3 FX Processor Operation
The KLARK TEKNIK FX processor offers a variety of effects. Use the PROGRAM knob to select an effect, and the PARAMETER knobs to adjust its settings. The TAP button can be used for tempo-based effects.
4.4 USB Audio Interface
The built-in USB interface allows you to send audio to and from your computer. This is ideal for recording your mix or playing back audio from your computer through the mixer. Ensure proper drivers are installed on your computer if necessary.
Figure 6: The USB Interface allows seamless integration with computer-based recording and playback.
5. Specifications
| Feature | Specification |
|---|---|
| Item Weight | 6.31 pounds |
| Product Dimensions | 12.99 x 10.43 x 3.54 inches |
| Item Model Number | QX1204USB |
| Color | Black |
| Power Source | Corded Electric |
| Number of Channels | 12 |
| Connectivity Technology | USB |
Figure 7: Dimensions of the Behringer XENYX QX1204USB Mixer.
6. Maintenance
- Cleaning: Use a soft, dry cloth to clean the mixer's surface. Avoid abrasive cleaners or solvents.
- Environment: Operate and store the mixer in a clean, dry environment away from extreme temperatures, humidity, and direct sunlight.
- Ventilation: Ensure adequate ventilation around the unit to prevent overheating.
- Servicing: Do not attempt to service the unit yourself. Refer all servicing to qualified service personnel.
7. Troubleshooting
- No Sound: Check all power connections, ensure the mixer is powered on, and verify all input/output cables are securely connected. Confirm channel level faders and the main mix faders are up. Check if any MUTE buttons are engaged.
- Distorted Sound: Reduce the GAIN on the input channels and the main mix. Ensure no CLIP LEDs are constantly lit. Check for proper impedance matching between devices.
- No Effects: Verify the FX SEND and FX RETURN levels are adjusted correctly. Ensure the KLARK TEKNIK FX processor is powered on and an effect is selected.
- USB Connection Issues: Ensure the USB cable is connected properly to both the mixer and your computer. Check your computer's audio settings to confirm the mixer is selected as the input/output device. Install any necessary drivers from the Behringer website.
8. Warranty and Support
For detailed warranty information, product registration, and technical support, please visit the official Behringer website or contact their customer service directly. Retain your proof of purchase for any warranty claims.
