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-Heart

84644f45cb13

Level measurements

Integrated-25.3 LUFS
Maximum momentary-21.4 LUFS
True peak-6.0 dBTP
RMS-25.1 dBFS
Active RMS-23.5 dBFS
Duration0.858 s
Maximum short-term—
Loudness range—
Sample peak-6.0 dBFS
Sample crest factor19.1 dB
True-peak crest factor19.1 dB
Active duration0.590 s

Level over time

RMS · 10.0 ms · 86 points

Active threshold -51.3 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 0.214 0.429 0.643 0.858 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 centroid1378 Hz
Peak frequency883 Hz
200 Hz–8 kHz energy100.0 %
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: -107.3 dBFS 31.5 Hz: -103.9 dBFS 40.0 Hz: -102.1 dBFS 50.0 Hz: -101.4 dBFS 63.0 Hz: -97.9 dBFS 80.0 Hz: -95.8 dBFS 100.0 Hz: -92.5 dBFS 125.0 Hz: -86.4 dBFS 160.0 Hz: -84.0 dBFS 200.0 Hz: -80.7 dBFS 250.0 Hz: -77.2 dBFS 315.0 Hz: -76.2 dBFS 400.0 Hz: -73.5 dBFS 500.0 Hz: -70.4 dBFS 630.0 Hz: -65.7 dBFS 800.0 Hz: -32.3 dBFS 1000.0 Hz: -45.9 dBFS 1250.0 Hz: -36.4 dBFS 1600.0 Hz: -31.4 dBFS 2000.0 Hz: -49.6 dBFS 2500.0 Hz: -65.2 dBFS 3150.0 Hz: -48.1 dBFS 4000.0 Hz: -63.9 dBFS 5000.0 Hz: -77.9 dBFS 6300.0 Hz: -81.6 dBFS 8000.0 Hz: -81.5 dBFS 10000.0 Hz: -69.9 dBFS 12500.0 Hz: -84.9 dBFS 16000.0 Hz: -96.9 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-Heart.caf
Acquisition
local_installation
Source observed
2026-08-09T06:27:15Z
Official source ↗

Technical metadata

SHA-25684644f45cb13ade3e608b287ea23d0e7584baa21574313513a4ee02407acccd7
Analyzed2026-08-09T06:27:15Z
CodecPCM signed 16-bit little-endian
Sample formats16 · 16 bit
Sample rate44100 Hz
Channels1 · mono
Analysis profilenotification-sound-db-bs1770-v2
FFmpegffmpeg version 8.1.2 Copyright (c) 2000-2026 the FFmpeg developers

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