01
Phase Correlation
Measures the statistical relationship between the left and right channels, from strongly opposing to strongly similar.
Check if your mix works in mono. Analyze phase correlation, left/right balance and stereo width, find sections with potential cancellation, and switch instantly between Stereo and Mono while listening.
Load a stereo audio file. The checker measures channel relationships across the track and builds a timeline of correlation, stereo width and mono-sum level change.
A mono compatibility checker helps you inspect what happens when the left and right channels of a stereo mix are combined. It does not decide whether a mix is good or bad. Instead, it exposes measurable channel relationships that can make mono playback different from stereo playback.
This tool combines a phase correlation meter, L/R balance measurement, stereo width analysis and a window-by-window comparison between stereo energy and the mono sum.
You can then listen to the same passage in Stereo and Mono without loading a second file or changing your DAW routing.
Measures the statistical relationship between the left and right channels, from strongly opposing to strongly similar.
Compares RMS energy in the left and right channels to reveal persistent channel-level imbalance.
Compares Mid and Side energy to describe how much side-channel information exists relative to the center.
Finds windows where summing the channels changes measured energy enough to make the section worth checking by ear.
The phase correlation meter compares the two stereo channels. A value near +1 means the channels are strongly similar. Values around zero indicate a less directly correlated stereo relationship. Negative values indicate opposing channel behavior that deserves attention when the signal is summed to mono.
Negative correlation does not automatically mean that the entire mix is unusable. Stereo effects, ambience and deliberately decorrelated material can change the reading. That is why the numerical analysis is paired with instant Stereo/Mono listening.
A phase checker can identify where cancellation is more likely. It cannot know the musical importance of the sound being affected.
The most useful mono compatibility test is not just a number. It is the ability to compare what you hear with what the channel measurements are showing.
In Stereo mode, the original left and right channels are sent to their respective output channels. In Mono mode, this tool creates a normalized sum of left and right and sends that same mono signal to both outputs.
Listen for sounds that become substantially quieter, lose spatial character or change in tonal balance. The timeline can help you jump to passages where the measured mono sum changes more strongly.
Stereo width is not a single physical dimension hidden inside an audio file. This stereo width analyzer uses a practical Mid/Side measurement: Mid represents information shared by the channels, while Side represents their difference.
The displayed Width Index is based on the RMS relationship between Side and Mid. A larger number means the file contains more side energy relative to its mid energy; it does not mean that a wider result is automatically better.
A wide mix can remain usable in mono, while another mix may contain specific opposing components that cancel more strongly. Correlation, Mid/Side balance and actual Stereo/Mono listening provide different pieces of the picture.
Start with the full-track correlation value, but do not stop there. A whole-song average can hide short sections where the relationship between channels changes substantially.
Use the timeline to locate those sections, select Stereo and listen to the original presentation, then switch to Mono at the same playback position. If a section is flagged because the summed level falls, listen for the actual musical consequence rather than assuming that every numerical flag requires correction.
L/R Balance answers a different question: whether one channel carries consistently more RMS energy. The Width Index describes Side versus Mid energy. Together these measurements make the tool more useful than treating a single phase-correlation number as the entire stereo analysis.
Not reliably from a finished stereo mix alone. The analyzer can detect a section where channel cancellation causes the mono sum to lose measurable energy, but it does not have access to the individual vocal, guitar, synth, reverb or other source tracks that created the mix.
For that reason, flagged passages are described as potential cancellation areas. The tool gives you a timestamp and measurable reason to inspect the section; listening tells you which audible element actually changed.
If your question is broader than stereo compatibility and you want to inspect spectral balance, dynamics and peaks, use the Mix Analyzer .
Stereo compatibility is one part of technical mix analysis. Use the next tool according to the specific question you want to answer.
Load the stereo mix, run the analysis and play it through the built-in player. Switch between Stereo and Mono while listening to the same passage. Use the correlation and cancellation timeline to locate sections that deserve closer comparison.
Correlation describes the statistical relationship between the left and right channels. Values toward +1 indicate stronger similarity, values around zero indicate less direct correlation, and negative values indicate increasingly opposing channel behavior.
No. A negative reading is a reason to inspect the relevant passage, especially in mono, rather than an automatic verdict on the mix. The audible consequence depends on what material is creating the channel difference.
This tool derives its Width Index from the RMS relationship between Side and Mid signals. More Side energy relative to Mid produces a larger value. It is a descriptive measurement, not a target score.
When left and right contain opposing waveform components, summing those channels can partially cancel them. The amount depends on their amplitude and phase relationship at that moment.
Not from a finished stereo file alone. It can identify sections with measurable channel opposition or mono-sum loss, but determining which musical element changed requires listening or access to the individual mix tracks.
The page can recognize a mono file, but stereo correlation, L/R balance and stereo width analysis require two distinct channels. For this tool, use the stereo version of your mix.
This implementation uses browser file access and Web Audio processing. The page code does not contain a request that sends the selected audio file to a server.
Use Ronter Audio Lab to investigate your mix, or contact Ronter Sound when your project needs professional recording, mixing or audio production work.
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