Tillie Doyle
Panning refers to the distribution of sounds across a stereo image. When using headphones, the stereo image is perceived differently compared to speakers due to the elimination of natural crossfeed, where each ear hears not only the speaker closest to it but also the opposite speaker. This difference in stereo perception impacts how sounds are panned, with hard-panned sounds in headphones appearing solely in one ear and centre-panned sounds appearing inside the listener's head. To achieve a similar effect to natural crossfeed with headphones, tools like the SPL Phonitor X headphone amplifier or plugins like Waves NX can be used to simulate a speaker-like listening experience. Additionally, mixers often rely on an imagined soundstage rather than speaker geometry when making panning choices, ensuring compatibility between speakers and headphones. While panning with headphones can be challenging due to the exaggerated stereo spread and mono compatibility issues, understanding these differences and utilizing the appropriate tools can enable effective panning decisions.
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What You'll Learn
Understanding the differences in stereo perception between speakers and headphones
Panning is a technique used in audio mixing to create a stereo image by adjusting the volume levels of a sound source in a stereo field. The stereo image is the perceived spatial location of a sound, which can be placed anywhere along the left-to-right panorama by panning.
When listening to speakers in a room, natural crossfeed occurs, where each ear hears not only the speaker closest to it but also some sound from the opposite speaker. This creates a "phantom center", where centre-panned sounds appear to come from a third speaker floating in front of the listener between the left and right speakers. If the listener is not positioned correctly, the stereo effect is diminished, and the phantom centre image becomes less focused.
Headphones, on the other hand, eliminate natural crossfeed. With headphones, hard-panned sounds are heard solely in one ear, and the centre image appears inside the listener's head. The isolation provided by headphones has been described as creating an unnatural listening environment, but it is important to remember that the stereo image generated by two speakers is also an illusion.
The differences in stereo perception between speakers and headphones can lead to variations in mixing decisions. For example, the stereo spread may be exaggerated when using headphones, and mono compatibility may be overestimated. Additionally, panning choices above 90% L/R can feel awkward with headphones, especially if the volume balance is not perfect. However, experienced mixers visualise an imagined soundstage and make panning choices based on this mental image rather than the physical geometry of the speakers.
In terms of the listening experience, speakers and headphones offer distinct advantages and drawbacks. Speakers enable sound to be perceived as vibrations in the body, providing a visceral, tactile experience, particularly with bass-heavy tracks. Headphones, on the other hand, block the ear canal or cover the earlobe, dampening environmental sounds and potentially impairing safety and postural control. Additionally, studies have shown that listening to emotional stories through headphones increases the listener's feeling of the narrator's presence and their willingness to donate money.
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Using a binaural panner like AMBEO Orbit
AMBEO Orbit is a free binaural panner plugin from Sennheiser that is designed to facilitate mixing immersive binaural content. It is part of Sennheiser's AMBEO range of software and hardware. With AMBEO Orbit, you can gain full flexibility and control over your binaural recordings. The plugin allows you to position additional mono or stereo sources into a 3D sound field, avoiding unwanted coloration. The patented clarity control lets you choose the amount of binaural coloration to apply, and the unique interface for creating binaural room reflections improves spatial accuracy compared to a reverb plugin.
To use AMBEO Orbit effectively, it is important to understand the basics of binaural recording and the differences between stereo and binaural audio. Binaural recording involves capturing sound using two microphones positioned at a specific distance apart, mimicking the distance between human ears. This technique creates a 3D audio effect, simulating a more immersive and realistic listening experience.
When working with AMBEO Orbit, you can start by importing your mono or stereo audio sources into the plugin. The plugin will allow you to position these sources within the 3D sound field, adjusting their placement in terms of left-right, front-back, and up-down dimensions. This process enables you to create a binaural mix that accurately represents the spatial arrangement of the sound sources.
Additionally, AMBEO Orbit's clarity control feature lets you fine-tune the binaural effect. By adjusting the amount of binaural coloration, you can enhance the perception of depth and spaciousness in your mix. The binaural room reflections feature further enhances the spatial accuracy, simulating the acoustic characteristics of a specific room or environment.
Overall, by using a binaural panner like AMBEO Orbit, you can achieve precise control over the placement of sound sources in a 3D space, creating an immersive binaural mix. This tool is particularly useful for applications such as virtual reality, augmented reality, and 3D audio productions, where an accurate representation of sound positioning is crucial for a compelling user experience.
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Panning decisions and gain structure
Panning decisions are influenced by the differences in stereo perception between speakers and headphones. When listening to speakers in a room, natural crossfeed occurs, where each ear hears the speaker closest to it and a bit of the opposite speaker. This creates a “phantom centre”, where centre-panned sounds appear to float in front of the listener between the left and right speakers. Headphones, on the other hand, eliminate natural crossfeed, resulting in hard-panned sounds being heard solely in one ear and the centre image appearing inside the listener's head.
To address these differences, mixers often rely on an imagined soundstage, visualising the left-to-right panoramic positions of instruments in their minds before making panning choices. This approach ensures that panning decisions are based on the desired soundstage rather than the geometry of the speakers. A technique known as LCR (Left-Centre-Right) mixing is commonly used to standardise panning decisions across speakers and headphones. In LCR mixing, channels are assigned to fully-left, fully-right, or centre positions, simplifying the panning process and ensuring consistency across playback systems.
When it comes to gain structure, it is important to consider the level changes that occur during panning. Centre-panned sounds, for example, will increase in level due to the combined output of the left and right channels. To compensate for this, mixing consoles and DAWs (Digital Audio Workstations) utilise pan laws that automatically lower the level of a signal when it is panned to the centre. These pan laws can vary, typically ranging from -2.5 dB to -4.5 dB, and can be adjusted within the DAW's preferences to suit the user's needs.
Additionally, it is recommended to check the levels of instruments during the panning process. Perceptual and subjective level changes may occur in relation to the rest of the track, and it is beneficial to gain stage the entire track after applying panning adjustments. Checking the mono compatibility of the mix is also crucial, as panning decisions made on headphones may not translate accurately to speaker playback. By converting the entire track to mono, you can identify any radical level changes and make necessary adjustments to ensure a cohesive and balanced sound.
In conclusion, when making panning decisions and considering gain structure, it is important to visualise the desired soundstage, utilise techniques like LCR mixing, pay attention to level changes, and verify mono compatibility. These practices will help ensure that your mix translates well across different playback systems and provides a satisfying listening experience.
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LCR (left-centre-right) mixing
LCR mixing can also add excitement to your mix. For example, instead of a lead guitar that's panned slightly off-centre, you could pan it directly to the centre or hard left or right. This extreme positioning can be more dramatic for the listener. It can also make your mix less cluttered, as there is less audio energy in large portions of the left-right spectrum.
LCR mixing is particularly useful when working with a large number of tracks, as it can help to open up the mix and create space. It can also be beneficial when mixing in mono, as it forces you to make decisions about which sources are most important and ensure they fit well together.
However, one criticism of LCR panning is that the hard panning creates a false sense of separation, which can cause problems when listening to the mix in mono. Additionally, when using headphones to pan, it is important to check for mono compatibility, as headphones can exaggerate the stereo spread and create an unnatural listening environment.
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Checking for mono compatibility
- Make your master output mono and connect a mono cable from your interface to an amplifier or powered speaker. You can also use a tool like PreSonus Monitor Station V2 to quickly sum your audio output into mono.
- Check how your track sounds in both mono and stereo while using mid/side processing. If you want a specific element to be wide and mono-compatible, make that element mono and add stereophonic layers.
- To ensure that your mix is mono-compatible, pan the elements of your song while listening in mono. This will help you hear how loud each element is in mono and allow you to fine-tune the mix.
- Use a stereo vectorscope display for your DAW, such as Flux Audio's Stereo Tool, to help identify potential mono-compatibility problems.
- If you are using headphones, be aware that panning mono sources hard left or right can be distracting and make it tricky to blend the sounds in your mix.
- When panning a mono track off-centre, be aware that its level in the mono balance will be reduced by a maximum of around 3dB. Ensure that the balance continues to function correctly in mono.
- Compare your mix against commercial productions in mono. Conventions on stereo imaging vary, so this can help you understand how your mix will sound in mono.
- Use a dedicated centre monitor to check your mixes in mono. This will give you a more accurate representation of how your mix will sound in mono.
- If you are using stereo speakers, plug one ear and move around a bit to simulate a mono listening experience. You can also step outside the control room to get a useful mono check.
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Frequently asked questions
Panning is a technique used in audio engineering to create the illusion of sound sources being at different positions in the stereo field.
Headphones eliminate natural crossfeed, meaning each ear only hears the sound from one speaker. This can make it challenging to achieve the desired panning effects, as the stereo image is perceived differently compared to speakers.
One challenge is that headphones can exaggerate the stereo spread, making it difficult to accurately judge mono compatibility. Additionally, hard-panning (100% L/R) can feel unnatural unless there is an even volume balance between the left and right channels.
Yes, there are plugins like Waves NX and CanOpener that simulate a studio environment or acoustic room space, providing a more accurate representation of the stereo field. Additionally, the SPL Phonitor X headphone amplifier offers crossfeed and angle controls to mimic the experience of listening to speakers.
To create the effect of a sound approaching from behind, you can try using a binaural panner like AMBEO Orbit or Oculus Spacializer. You can also experiment with automating a high cut along with stereo width or using reverb and EQ adjustments.
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