macOS system sounds · System alert
Purr
3770ff805cf8
Level measurements
Integrated-31.4 LUFS
Maximum momentary-28.6 LUFS
True peak-10.7 dBTP
RMS-33.9 dBFS
Active RMS-30.4 dBFS
Duration0.758 s
| Maximum short-term | — |
|---|---|
| Loudness range | — |
| Sample peak | -10.8 dBFS |
| Sample crest factor | 23.1 dB |
| True-peak crest factor | 23.2 dB |
| Active duration | 0.340 s |
Level over time
RMS · 10.0 ms · 76 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 centroid698 Hz
Peak frequency797 Hz
200 Hz–8 kHz energy96.0 %
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 system sounds v26.6.1
System alert
Purr.aiff
- Acquisition
local_installation- Source observed
- 2026-08-09T06:27:14Z
Technical metadata
| SHA-256 | 3770ff805cf82b7808db972a257e7c9ccca0065ab7cd8eaf148a8df33baeb903 |
|---|---|
| Analyzed | 2026-08-09T06:27:14Z |
| Codec | PCM signed 24-bit big-endian |
| Sample format | s32 · 24 bit |
| Sample rate | 48000 Hz |
| Channels | 2 |
| Analysis profile | notification-sound-db-bs1770-v2 |
| FFmpeg | ffmpeg version 8.1.2 Copyright (c) 2000-2026 the FFmpeg developers |