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

AttachmentBegin

b8154f154649

Level measurements

Integrated-31.3 LUFS
Maximum momentary-31.3 LUFS
True peak-7.4 dBTP
RMS-31.0 dBFS
Active RMS-28.6 dBFS
Duration0.086 s
Maximum short-term—
Loudness range—
Sample peak-8.3 dBFS
Sample crest factor22.6 dB
True-peak crest factor23.6 dB
Active duration0.050 s

Level over time

RMS · 10.0 ms · 9 points

Active threshold -60.0 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 0.022 0.043 0.065 0.086 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 centroid12235 Hz
Peak frequency16278 Hz
200 Hz–8 kHz energy30.0 %
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: -155.6 dBFS 31.5 Hz: -152.7 dBFS 40.0 Hz: -152.0 dBFS 50.0 Hz: -151.5 dBFS 63.0 Hz: -109.1 dBFS 80.0 Hz: -92.3 dBFS 100.0 Hz: -80.5 dBFS 125.0 Hz: -64.8 dBFS 160.0 Hz: -59.9 dBFS 200.0 Hz: -60.3 dBFS 250.0 Hz: -63.5 dBFS 315.0 Hz: -77.9 dBFS 400.0 Hz: -89.0 dBFS 500.0 Hz: -88.2 dBFS 630.0 Hz: -90.8 dBFS 800.0 Hz: -77.8 dBFS 1000.0 Hz: -72.1 dBFS 1250.0 Hz: -63.6 dBFS 1600.0 Hz: -59.7 dBFS 2000.0 Hz: -58.7 dBFS 2500.0 Hz: -57.9 dBFS 3150.0 Hz: -51.6 dBFS 4000.0 Hz: -55.6 dBFS 5000.0 Hz: -45.1 dBFS 6300.0 Hz: -41.8 dBFS 8000.0 Hz: -39.4 dBFS 10000.0 Hz: -45.2 dBFS 12500.0 Hz: -41.3 dBFS 16000.0 Hz: -34.5 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

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

Technical metadata

SHA-256b8154f15464967e625a2051d30292859508140fba1fd58d8bdcbefa7d165400c
Analyzed2026-08-09T06:27:21Z
CodecPCM signed 24-bit big-endian
Sample formats32 · 24 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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