Notification Sound MeasurementsMeasured levels and spectral characteristics of current OS and app event sounds
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macOS alert tones · Message

Text-Message-Acknowledgement-Exclamation

a1224eabb752

Level measurements

Integrated-24.5 LUFS
Maximum momentary-23.2 LUFS
True peak-12.0 dBTP
RMS-31.0 dBFS
Active RMS-27.4 dBFS
Duration1.047 s
Maximum short-term—
Loudness range—
Sample peak-12.0 dBFS
Sample crest factor19.0 dB
True-peak crest factor19.0 dB
Active duration0.460 s

Level over time

RMS · 10.0 ms · 105 points

Active threshold -58.7 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 0.00 0.26 0.52 0.78 1.05 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 centroid1139 Hz
Peak frequency883 Hz
200 Hz–8 kHz energy99.9 %
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: -82.2 dBFS 31.5 Hz: -78.9 dBFS 40.0 Hz: -75.0 dBFS 50.0 Hz: -74.3 dBFS 63.0 Hz: -73.9 dBFS 80.0 Hz: -72.8 dBFS 100.0 Hz: -75.0 dBFS 125.0 Hz: -77.7 dBFS 160.0 Hz: -76.2 dBFS 200.0 Hz: -73.8 dBFS 250.0 Hz: -72.8 dBFS 315.0 Hz: -72.3 dBFS 400.0 Hz: -68.2 dBFS 500.0 Hz: -65.0 dBFS 630.0 Hz: -59.7 dBFS 800.0 Hz: -35.4 dBFS 1000.0 Hz: -42.5 dBFS 1250.0 Hz: -58.0 dBFS 1600.0 Hz: -38.6 dBFS 2000.0 Hz: -51.7 dBFS 2500.0 Hz: -68.0 dBFS 3150.0 Hz: -78.9 dBFS 4000.0 Hz: -85.4 dBFS 5000.0 Hz: -91.9 dBFS 6300.0 Hz: -94.0 dBFS 8000.0 Hz: -98.0 dBFS 10000.0 Hz: -101.8 dBFS 12500.0 Hz: -104.5 dBFS 16000.0 Hz: -108.1 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 alert tones v26.6.1

Message

Text-Message-Acknowledgement-Exclamation.caf
Acquisition
local_installation
Source observed
2026-08-09T06:27:15Z
Official source ↗

Technical metadata

SHA-256a1224eabb75266ff9ee2837a8da828c390bd8e87fd99c85c52afd20a6d3fdbbb
Analyzed2026-08-09T06:27:15Z
CodecPCM signed 16-bit little-endian
Sample formats16 · 16 bit
Sample rate44100 Hz
Channels2 · stereo
Analysis profilenotification-sound-db-bs1770-v2
FFmpegffmpeg version 8.1.2 Copyright (c) 2000-2026 the FFmpeg developers

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