Technical Specifications

Features

Four precision diagnostic tools, each engineered to answer a specific question about your mix. No fluff, no opinion — just objective audio analysis that tells you exactly what to fix.

TOOL 1

Spectrum Analysis

Full-frequency visualization with reference comparison

Upload any reference track and your mix side by side. The spectrum analyzer maps energy across the entire audible range — 20Hz to 20kHz — at 1/12-octave resolution. Every frequency band is compared against your reference, with color-coded deviation indicators showing exactly where your mix is too hot, too weak, or dead-on.

Key Metrics

Integrated LUFS

Long-term loudness measurement per ITU-R BS.1770-4. Compare against platform targets (-14 LUFS for Spotify, -16 for Apple Music).

Balance Score (1-10)

Composite score comparing your spectral balance against the reference across all bands. Above 7 indicates professional-level frequency distribution.

Peak & RMS

True peak and RMS levels with sample-accurate detection. Identify inter-sample peaks before they clip on consumer playback systems.

Avg Deviation

Mean frequency deviation across all bands relative to reference. Target: ±1.0dB or better for competitive commercial masters.

Use Cases

Identify low-end buildup below 100Hz that muddies your mix

Spot scooped midrange (500Hz-2kHz) that makes vocals disappear

Detect harsh high-frequency content (8kHz+) causing listener fatigue

A/B compare against chart-topping references in your genre

20Hz — 20kHz · 1/12 Oct Resolution · Multi-Reference
TOOL 2

Variance Map

Band-by-band deviation analysis with severity grading

The Variance Map is Audit Audio's flagship feature. It breaks the frequency spectrum into six critical bands — SUB, LOW, LO-MID, MID, HI-MID, and HIGH — and measures your mix's deviation from the reference in decibels. Each band receives a severity grade: Minor (<1.5dB), Moderate (1.5-3dB), or Critical (>3dB). This gives you a surgical priority list: fix the Critical bands first, then work through Moderate, and the mix tightens up fast.

Key Metrics

Band Deviation (dB)

Per-band deviation from reference, displayed with directional indicators (+ for excess energy, - for deficiency).

Severity Grade

Three-tier classification system. Critical bands demand immediate attention. Moderate bands indicate areas for improvement. Minor deviations are within acceptable tolerance.

Overall Rating (1-10)

Aggregate score based on number and severity of deviation bands. A score of 8+ indicates reference-level consistency across all bands.

Target Tolerance

Configurable tolerance window. Default is ±1.0dB — tighten for mastering-level precision or loosen for rough mix evaluation.

Use Cases

Quickly identify the 1-2 frequency bands causing the biggest problems

Prioritize mix fixes by severity instead of guessing

Track improvement over multiple mix revisions with before/after deviation data

Share variance reports with clients to explain why a mix needs revision

6 Critical Bands · Severity Grading · Export PDF
TOOL 3

Dynamic Range

Crest factor, loudness distribution, and genre matching

Modern streaming platforms normalize everything to LUFS — but genre expectations for dynamic range vary wildly. Electronic music sits tight at DR 6-8, while jazz and classical demand DR 12-16. The Dynamic Range tool measures crest factor, peak-to-loudness ratio (PLR), and loudness range (LRA), then compares your track against genre-specific targets. It also detects inter-sample peaks (ISPs) that survive encoding and cause distortion on streaming platforms.

Key Metrics

DR Value (dB)

Dynamic Range measurement following the Pleasurize Music Foundation standard. Genre-specific: Electronic DR 6-8, Rock DR 8-12, Jazz DR 12-16.

Crest Factor

Ratio of peak to RMS level. Higher crest factor means more dynamic headroom — but too high and your track sounds quiet on streaming.

PLR (Peak-to-Loudness Ratio)

Industry-standard measurement comparing true peak to integrated loudness. EBU R128 recommends PLR of 8-14dB for broadcast.

LRA (Loudness Range)

Measures variation between softest and loudest sections. Higher LRA = more dynamic contrast between verses, choruses, and breakdowns.

Use Cases

Ensure your master hits competitive loudness without crushing dynamics

Match dynamic range to genre expectations for streaming platforms

Detect inter-sample peaks that cause distortion after lossy encoding

Analyze loudness distribution across song sections (verse vs chorus)

DR Meter · True Peak · ISP Detection · Genre Profiles
TOOL 4

Stereo Field

Goniometer, width analysis, and mono compatibility

A wide stereo field sounds impressive — until it collapses to mono on a phone speaker, Bluetooth speaker, or club system. The Stereo Field tool visualizes your spatial image with a real-time goniometer (Lissajous display), measures stereo width per frequency band, and validates mono compatibility. If your sub-bass is wider than 30%, you have a phase problem. If the goniometer shows energy only on the horizontal axis, your mix is effectively mono. The tool tells you exactly what's happening and where.

Key Metrics

Phase Correlation (+1 to -1)

+1.0 = perfectly in phase (mono-compatible). 0 = uncorrelated (safe stereo). -1.0 = perfectly out of phase (complete cancellation in mono). Target: +0.7 and above.

Stereo Width (%)

Overall width measurement from mono (0%) to full stereo (100%). Width measured per band: SUB should be <30%, HIGH can safely reach 80-95%.

Mono Compatibility

Validation check that simulates mono playback. Flags phase cancellation risks with specific frequency band identification.

Anti-Phase (%)

Percentage of signal with negative phase correlation. Values above 5% indicate problematic stereo processing that will cause mono collapse.

Use Cases

Check mono compatibility before sending masters to streaming platforms

Identify over-processed stereo widening that causes phase cancellation

Ensure sub-bass remains mono-centered for club and vinyl playback

Visualize L/R balance and correct channel energy mismatches

Goniometer · L/R Balance · Width by Band · Mono Check
At a Glance

Feature Comparison

CapabilitySpectrumVarianceDynamicsStereo
Reference Track Comparison
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Frequency Band Breakdown
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Severity / Priority Grading—
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LUFS / Loudness Measurement
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Crest Factor & PLR——
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Genre Profile Matching——
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Goniometer / Lissajous Display———
Mono Compatibility Check———
Phase Correlation Meter
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ISP (Inter-Sample Peak) Detection——
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PDF Report Export
Real-Time Analysis
Ready to analyze your mix?

All four tools are available in the beta. Upload a track, load a reference, and get objective answers in seconds.

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