macOS alert tones · Message
Text-Message-Acknowledgement-QuestionMark
1c0643278184
Level measurements
Integrated-20.5 LUFS
Maximum momentary-20.5 LUFS
True peak-6.0 dBTP
RMS-24.1 dBFS
Active RMS-19.4 dBFS
Duration0.500 s
| Maximum short-term | — |
|---|---|
| Loudness range | — |
| Sample peak | -6.0 dBFS |
| Sample crest factor | 18.1 dB |
| True-peak crest factor | 18.1 dB |
| Active duration | 0.170 s |
Level over time
RMS · 10.0 ms · 50 points
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 centroid772 Hz
Peak frequency764 Hz
200 Hz–8 kHz energy100.0 %
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-QuestionMark.caf
- Acquisition
local_installation- Source observed
- 2026-08-09T06:27:15Z
Technical metadata
| SHA-256 | 1c0643278184edebc692efc918998fe5f71cb86f9c773ab00f3b28160b4be9af |
|---|---|
| Analyzed | 2026-08-09T06:27:15Z |
| Codec | PCM signed 16-bit little-endian |
| Sample format | s16 · 16 bit |
| Sample rate | 44100 Hz |
| Channels | 2 · stereo |
| Analysis profile | notification-sound-db-bs1770-v2 |
| FFmpeg | ffmpeg version 8.1.2 Copyright (c) 2000-2026 the FFmpeg developers |