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

Slow Keys, 1st Key Pressed

e74db3d0cf4a

Level measurements

Integrated-32.5 LUFS
Maximum momentary-32.5 LUFS
True peak-14.6 dBTP
RMS-31.9 dBFS
Active RMS-30.5 dBFS
Duration0.109 s
Maximum short-term—
Loudness range—
Sample peak-14.6 dBFS
Sample crest factor17.3 dB
True-peak crest factor17.3 dB
Active duration0.080 s

Level over time

RMS · 10.0 ms · 11 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 0.027 0.055 0.082 0.109 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 centroid2163 Hz
Peak frequency1798 Hz
200 Hz–8 kHz energy95.6 %
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: -98.5 dBFS 31.5 Hz: -93.3 dBFS 40.0 Hz: -89.9 dBFS 50.0 Hz: -85.2 dBFS 63.0 Hz: -71.9 dBFS 80.0 Hz: -69.7 dBFS 100.0 Hz: -55.6 dBFS 125.0 Hz: -49.9 dBFS 160.0 Hz: -48.2 dBFS 200.0 Hz: -56.4 dBFS 250.0 Hz: -57.4 dBFS 315.0 Hz: -48.0 dBFS 400.0 Hz: -42.0 dBFS 500.0 Hz: -44.7 dBFS 630.0 Hz: -51.0 dBFS 800.0 Hz: -43.3 dBFS 1000.0 Hz: -42.7 dBFS 1250.0 Hz: -39.7 dBFS 1600.0 Hz: -35.2 dBFS 2000.0 Hz: -36.2 dBFS 2500.0 Hz: -35.3 dBFS 3150.0 Hz: -41.7 dBFS 4000.0 Hz: -40.8 dBFS 5000.0 Hz: -39.4 dBFS 6300.0 Hz: -48.1 dBFS 8000.0 Hz: -48.9 dBFS 10000.0 Hz: -51.8 dBFS 12500.0 Hz: -56.1 dBFS 16000.0 Hz: -67.3 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 CoreAudio event sounds v26.6.1

UI feedback

accessibility/Slow Keys, 1st Key Pressed.aif
Acquisition
local_installation
Source observed
2026-08-09T06:27:20Z
Official source ↗

Technical metadata

SHA-256e74db3d0cf4a84c6b6e6c5e1b3590c0e86ec1a942bcd4cd582cabaf86bd582f9
Analyzed2026-08-09T06:27:16Z
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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