How To Run 2 Mixers At Once

Mixing audio effectively is an art form that requires precision, skill, and a keen ear. Whether you’re a seasoned veteran of the soundboard or just starting out, mastering the ability to run multiple mixers simultaneously can significantly enhance your audio production capabilities. This guide will provide a comprehensive walkthrough of how to run 2 mixers at once, ensuring seamless transitions and exceptional sound quality for your audience.

Before delving into the technical aspects of running 2 mixers, it’s crucial to understand the key benefits it offers. By utilizing multiple mixers, you gain greater control over individual sound sources, allowing for more precise adjustments. This increased flexibility enables you to create unique and complex mixes that would not be possible with a single mixer. Additionally, running 2 mixers provides redundancy in the event of technical difficulties, ensuring that your audio performance goes uninterrupted.

To successfully run 2 mixers at once, meticulous planning and proper signal routing are paramount. Begin by connecting both mixers to a power source and linking them via an appropriate connection. Determine which mixer will serve as the primary source for the main mix and which will handle individual channels or external effects. Utilize submix outputs and aux sends to route specific signals to the second mixer, enabling you to create parallel processing chains or complex effects architectures. Remember to pay attention to signal levels and gain staging to prevent unwanted distortion or noise.

Setting Up the Mixers

To run two mixers at once, the first step is to set them up properly. This involves ensuring that they are both connected to a power source and that the audio cables are properly routed.

Power Connections

Each mixer will need to be connected to a power source. This can be done using the AC adapter that came with the mixer or by plugging the mixer into a power strip. Once the mixers are connected to power, they should be turned on.

Audio Connections

Next, the audio cables will need to be connected. The main output of each mixer will need to be connected to an input on the other mixer. This will allow the audio from one mixer to be sent to the other mixer.

In addition to the main output, each mixer may also have auxiliary outputs. These outputs can be used to send a specific mix of audio to another device, such as a recorder or a PA system.

Once the audio cables are connected, the mixers will be ready to be used together.

Input and Output Configuration

Here is a guide to the most common types of mixers and their input and output configurations:

Mixer Type	Inputs	Outputs
DJ Mixer	2-4 channels with phono/line inputs, microphone input	Master output, booth output
Live Sound Mixer	8-16 channels with XLR/TRS inputs, stereo inputs	Main output, monitor outputs, auxiliary outputs
Studio Mixer	4-8 channels with XLR/TRS inputs, stereo inputs	Main output, monitor outputs, auxiliary outputs

Creating a Master Output

To create a master output, connect the MAIN OUT ports of each mixer to a stereo input channel on the second mixer. This allows the combined signals from both mixers to be routed to a single output. Make sure to adjust the levels on each mixer’s MAIN OUT ports to create a balanced mix.

Connecting Submixes

If you want to create a submix of channels from the first mixer to send to the second mixer, use the AUX SEND outputs on the first mixer. These outputs allow you to create multiple submixes of different channels, which can then be routed to specific channels on the second mixer.

Using Inserts

If you want to add external effects to the submix or master output, use the INSERT ports on the mixers. Insert ports allow you to connect external effects units between the mixer’s input and output stages. This lets you process the signals with effects such as compression, EQ, or reverbs without affecting the other channels on the mixer.

Feature	Purpose
MAIN OUT ports	Connect to the stereo input channel on the second mixer
AUX SEND outputs	Create multiple submixes of different channels
INSERT ports	Connect external effects units between the mixer’s input and output stages

Mixing the Main Signal

To mix the main signal, you’ll need to connect the outputs of both mixers to the inputs of a third mixer. This mixer will be used to blend the signals from the two mixers into a single output. You’ll need to set the gain levels on the third mixer so that the signals from the two mixers are balanced.

Once you’ve connected the mixers, you can start mixing the main signal. Start by adjusting the gain levels on the third mixer until the signals from the two mixers are balanced. Then, adjust the EQ settings on the third mixer to taste. You can use the EQ to adjust the overall tone of the main signal.

Connecting the Mixers

To connect the mixers, you’ll need to use a TRS cable. A TRS cable is a three-conductor cable with a tip, a ring, and a sleeve. The tip and ring carry the balanced audio signals from the mixers, while the sleeve is used for grounding.

Connector	Function
Tip	Balanced audio signal from mixer 1
Ring	Balanced audio signal from mixer 2
Sleeve	Ground

To connect the mixers, insert the TRS cable into the output of the first mixer and the input of the second mixer. Then, insert the other end of the TRS cable into the input of the third mixer.

Adjusting the Gain Levels

Once you’ve connected the mixers, you’ll need to adjust the gain levels on the third mixer. The gain level controls the amplitude of the audio signal. You’ll need to set the gain levels so that the signals from the two mixers are balanced.

To adjust the gain levels, turn the gain knob on the third mixer until the level meters on the mixer reach the desired level. You’ll want to set the gain levels so that the signals from the two mixers are equal in amplitude.

Adjusting the EQ Settings

Once you’ve adjusted the gain levels, you can start adjusting the EQ settings on the third mixer. The EQ settings control the frequency response of the audio signal. You can use the EQ to adjust the overall tone of the main signal.

To adjust the EQ settings, turn the EQ knobs on the third mixer until you achieve the desired sound. You can use the EQ to boost or cut specific frequencies. For example, you can boost the bass frequencies to add warmth to the sound, or you can cut the high frequencies to reduce sibilance.

Routing External Inputs

To connect external inputs to your mixers, you’ll need to use a patch cable to connect the output of the external device to the input channel on your mixer. Once you’ve made the connection, you can use the channel fader to control the volume of the external input.

Here are a few tips for routing external inputs:

Use a high-quality patch cable to ensure a clean and reliable signal.
Make sure the output level of the external device is not too high, as this can cause distortion.
If you’re using multiple external inputs, use a mixer with enough channels to accommodate them.
Use the channel EQ to adjust the sound of the external input to taste.
Use the channel effects to add depth and dimension to the sound of the external input.

The following table provides a summary of the steps involved in routing external inputs to your mixers:

Step	Description
1	Connect the output of the external device to the input channel on your mixer using a patch cable.
2	Use the channel fader to control the volume of the external input.
3	Use the channel EQ to adjust the sound of the external input to taste.
4	Use the channel effects to add depth and dimension to the sound of the external input.

Adjusting Input Levels

Setting appropriate input levels is crucial to ensure a clean and balanced mix when using multiple mixers. Here’s a detailed guide to adjusting input levels effectively:

**1. Calibrate Your Mixers:** Ensure that both mixers are calibrated to the same input sensitivity. This can be done by connecting a reference signal to both mixers and adjusting their input gains until they produce the same level on their output meters.

**2. Gain Staging:** Set the input gain for each channel on the first mixer to around 50%. This provides enough headroom for the signal to avoid clipping while allowing you to make adjustments as needed.

**3. Monitor Output Levels:** Use the output meters on both mixers to monitor the signal levels. Aim for a signal that sits comfortably below 0dB to avoid distortion.

**4. Use Send/Return Loops:** If available, utilize send/return loops to connect the two mixers. This allows you to send a signal from the first mixer to the second for processing and then return the processed signal to the first mixer.

5. Avoid Overloading Inputs

Check the input meters on both mixers to ensure signals are not exceeding the recommended levels.
If inputs are overloading, reduce the gain on the first mixer or use an attenuator to lower the signal level.
Monitor the output levels to ensure they remain within an acceptable range.

6. Table: Input Level Settings

Mixer 1	Mixer 2
Calibrated to 0dBVU	Calibrated to -10dBV
Channel Gain: 50%	Channel Gain: 60%
Output Level: -6dB	Output Level: -3dB
Send Level: -10dB	Return Level: 0dB

Monitoring the Mix

1. Use Separate Headphone Outputs

Each mixer should have its own dedicated headphone output. This allows you to monitor both mixes independently, without having to switch between inputs.

2. Set Up Cue Systems

Cue systems allow you to preview each channel before sending it to the main mix. This is especially useful when mixing multiple sources, as it helps you stay organized and avoid mistakes.

3. Use a Splitter Box

If your mixers don’t have separate headphone outputs, you can use a splitter box to create multiple headphone feeds from a single source.

4. Calibrate Your Headphones

Make sure your headphones are calibrated to the same volume levels. This ensures that you’re hearing both mixes accurately.

5. Position Your Headphones

Wear your headphones comfortably and make sure they’re isolating the sound from outside noise.

6. Take Breaks

Give your ears a break every hour or so to avoid fatigue and damage.

7. External Monitoring Options

In addition to headphones, you can also use external speakers or monitors to monitor your mix. External monitors provide a wider stereo field and more accurate frequency response.

Troubleshooting Common Issues

If you are experiencing issues running two mixers at once, here are some common problems and their solutions:

Power Supply

Ensure that both mixers are connected to separate, reliable power sources. A faulty or shared power supply can lead to erratic behavior.

Grounding

Check that both mixers are properly grounded. Inadequate grounding can cause noise and interference.

XLR Cable Quality

Inspect the XLR cables used to connect the mixers. Damaged or low-quality cables can cause signal degradation.

Master/Slave Configuration

If using a master/slave setup, ensure the master mixer is controlling the slave. Incorrect configuration can result in synchronization issues.

Signal Levels

Adjust the input and output levels of both mixers to prevent clipping or distortion.

FX Send/Return

Check that any FX send/return loops are properly connected and configured. Misconnections or incorrect settings can disrupt the signal flow.

Cross-Talk

Minimize cross-talk by ensuring that the input and output channels are not adjacent. Also, use balanced connections to reduce signal leakage.

Feedback

If experiencing feedback, identify the source by muting individual channels. Once identified, adjust the gain or EQ settings to eliminate the feedback path. To further mitigate feedback, consider using a feedback suppressor or notch filter.

Optimizing Mixer Performance

When running multiple mixers at once, it’s crucial to optimize performance for a seamless and efficient operation. Here are some key considerations:

Maximizing Workflow

Organize the mixers strategically to facilitate smooth workflow. Position them close enough for easy access while maintaining adequate space for movement and cable management.

Load Balancing

Distribute the workload evenly between the mixers. Avoid overloading one mixer while another remains underutilized. This ensures optimal performance and reduces the risk of technical issues.

Amplification Configuration

Configure the amplification system to match the output capabilities of the mixers. Ensure the speakers are compatible with the power output of each mixer to avoid distortion or damage.

Input and Output Connections

Check all input and output connections to ensure they are secure and properly labeled. Use high-quality cables and connectors to minimize signal loss and interference.

Signal Level Monitoring

Monitor the signal levels on both mixers regularly. Adjust the input and output levels to maintain optimal signal strength and avoid distortion or feedback.

Ground Loops

Ground loop is a potential issue when operating multiple mixers. Ensure proper grounding of all electrical devices to minimize noise and interference.

Power Source

Use a dedicated power source for each mixer. Avoid sharing outlets or using extension cords, as this can result in power fluctuations or overload.

Cooling and Ventilation

Provide adequate ventilation and cooling for the mixers to prevent overheating and ensure their longevity. Keep them away from heat sources and allow for proper airflow.

Technical Support

Have a backup plan and contact information for technical support in case of unexpected issues. This will minimize downtime and ensure a smooth event.

Additional Tips

Here are some additional tips to further optimize mixer performance:

Tip
Use a mixing console with enough channels for all input sources.
Experiment with different signal routing options for optimal sound quality.
Utilize effects pedals or outboard gear to enhance the mix and create desired sonic textures.
Record the mix for reference and future editing or troubleshooting.

Advanced Techniques for Using Two Mixers

1. Separate EQ Ranges

Assign different EQ frequency ranges to each mixer to create a more balanced sound. For example, use one mixer for low frequencies and the other for high frequencies.

2. Utilize Multiband Compression

Apply multiband compression to different frequency ranges on each mixer to control dynamics and enhance specific elements of the mix.

3. Create Stereo Enhancements

Use one mixer to pan the main mix and the other to create stereo-widening effects, such as delays or reverbs.

4. Process Stems Separately

Split the track stems into two groups and process them on separate mixers for more precise control over individual elements.

5. Parallel Processing

Duplicate a signal path on one mixer and process it differently on the other mixer, creating parallel effects that can enhance the mix.

6. Balanced Level Control

Use the master faders on both mixers to ensure a balanced overall level and prevent overloading.

7. Monitoring and Mixing

Utilize headphones or studio monitors connected to both mixers to monitor the individual mixes and make adjustments.

8. Spatial Mixing

Create spatial depth by panning tracks and effects on different mixers to enhance the illusion of width and depth.

9. Group Similar Elements

Group similar tracks, such as vocals or guitars, and process them on the same mixer for cohesive control.

10. Aligning Phases

Aligning phases between the two mixers is crucial to prevent frequency cancellations. Use phase meters or flip the polarity switches on one mixer to align the signals. This ensures a coherent and balanced sound image.

Mixer 1	Mixer 2
EQ Range: Low Frequencies	EQ Range: High Frequencies
Multiband Compression: Bass	Multiband Compression: Vocals
Panning: Main Mix	Panning: Stereo Widening

Operating two mixers simultaneously is a valuable skill, allowing you to manage more input sources and achieve complex audio mixes. To efficiently run two mixers, follow these steps:

Connect the Mixers: Use a patch cable to connect the output of Mixster A to the input of Mixer B.
Sync the Clocks: Ensure both mixers are using the same clock source. This prevents audio dropouts and phase misalignments.
Route the Audio: Assign the audio sources to the appropriate channels on both mixers. This may involve using submixes or auxiliary sends.
Adjust Levels: Set the input levels on Mixer B to match the output levels of Mixer A. This avoids overloading or under-utilizing the inputs.
Mix and Monitor: Use the faders and EQ controls on both mixers to balance and process the audio. Monitor the output using headphones or speakers.