Notification Sound MeasurementsMeasured levels and spectral characteristics of current OS and app event sounds
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macOS VoiceOver event sounds · UI feedback

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c9a8d1263b76

Level measurements

Integrated-22.2 LUFS
Maximum momentary-21.2 LUFS
True peak-7.2 dBTP
RMS-19.8 dBFS
Active RMS-19.7 dBFS
Duration0.165 s
Maximum short-term—
Loudness range—
Sample peak-7.2 dBFS
Sample crest factor12.6 dB
True-peak crest factor12.6 dB
Active duration0.160 s

Level over time

RMS · 10.0 ms · 17 points

Active threshold -56.1 dBFS
Short-window RMS level over time Each point is the channel-combined RMS of a non-overlapping frame. Values below −80 dBFS are pinned to the chart floor for display; the canonical JSON retains measured values, and digital silence remains null. 0 -20 -40 -60 -80 0.000 0.041 0.082 0.124 0.165 RMS (dBFS) Time (seconds)

Each point is the channel-combined RMS of a non-overlapping frame. Values below −80 dBFS are pinned to the chart floor for display; the canonical JSON retains measured values, and digital silence remains null.

Frequency characteristics

Spectral centroid674 Hz
Peak frequency764 Hz
200 Hz–8 kHz energy99.3 %
Third-octave band energy Frequency is shown on the horizontal axis and band energy on the vertical axis. Values below −120 dBFS are pinned to the chart floor for display. 0 -20 -40 -60 -80 -100 -120 31.5 63 125 250 500 1k 2k 4k 8k 16k 25.0 Hz: -59.8 dBFS 31.5 Hz: -57.1 dBFS 40.0 Hz: -56.3 dBFS 50.0 Hz: -57.8 dBFS 63.0 Hz: -56.8 dBFS 80.0 Hz: -57.8 dBFS 100.0 Hz: -56.2 dBFS 125.0 Hz: -54.5 dBFS 160.0 Hz: -55.5 dBFS 200.0 Hz: -53.5 dBFS 250.0 Hz: -45.9 dBFS 315.0 Hz: -33.5 dBFS 400.0 Hz: -30.6 dBFS 500.0 Hz: -35.5 dBFS 630.0 Hz: -37.0 dBFS 800.0 Hz: -28.6 dBFS 1000.0 Hz: -29.7 dBFS 1250.0 Hz: -51.5 dBFS 1600.0 Hz: -71.4 dBFS 2000.0 Hz: -78.0 dBFS 2500.0 Hz: -72.2 dBFS 3150.0 Hz: -73.6 dBFS 4000.0 Hz: -90.1 dBFS 5000.0 Hz: -90.0 dBFS 6300.0 Hz: -90.0 dBFS 8000.0 Hz: -89.1 dBFS 10000.0 Hz: -87.9 dBFS 12500.0 Hz: -87.5 dBFS 16000.0 Hz: -85.3 dBFS Band energy (dBFS) Frequency (Hz)

Frequency is shown on the horizontal axis and band energy on the vertical axis. Values below −120 dBFS are pinned to the chart floor for display.

Current source occurrences

macOS VoiceOver event sounds v26.6.1

UI feedback

Back.aiff
Acquisition
local_installation
Source observed
2026-08-09T06:27:27Z
Official source ↗

Technical metadata

SHA-256c9a8d1263b762f65b72367a5fe05479083f506809125cc4410f8485759910165
Analyzed2026-08-09T06:27:21Z
CodecPCM signed 16-bit big-endian
Sample formats16 · 16 bit
Sample rate44100 Hz
Channels2
Analysis profilenotification-sound-db-bs1770-v2
FFmpegffmpeg version 8.1.2 Copyright (c) 2000-2026 the FFmpeg developers

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