Audio Lab · Reproducible demonstration

Auto EQ · OFF / POST

The same original source, the same chain. A has Auto EQ off; B applies Auto EQ after Impact. All other stages are identical.

Audio files load only on request. Headphones and a comfortable playback level are recommended.

A · Integrated loudness—
B · Integrated loudness—

Measured average spectrum

A · OFFB · POST
Numerical spectrum values

Raw values. B−A includes all chain interactions. In matched mode, the plot adds the matching gain shown below.

HzA · dBFSB · dBFSB−A · dB
22-49.82-50.18-0.37
28———
34-40.08-40.41-0.33
43-32.61-32.94-0.33
53-31.49-31.81-0.32
66-32.8-33.14-0.34
81-31.44-31.71-0.28
101-30.35-30.56-0.21
125-33.12-33.19-0.07
155-32.88-32.740.14
193-35.76-35.290.47
239-35.91-35.380.53
297-36.5-35.810.68
369-38.74-37.840.9
458-41.79-41.10.68
568-40.98-40.150.83
705-47.43-46.331.09
874-46.55-45.051.5
1085-52.34-50.611.73
1346-51.79-49.931.86
1671-58.28-54.623.66
2073-58.68-55.573.11
2573-63.15-60.352.8
3193-60.3-57.562.74
3962-57.51-54.892.62
4916-55.0-52.812.19
6101-51.94-50.461.48
7571-48.94-48.20.75
9395-46.38-46.180.2
11659-43.53-43.58-0.05
14468-41.47-41.62-0.15
17954-39.53-39.69-0.17

Average over the complete 16-second excerpt, 32 logarithmic bands. Gaps indicate bands without a resolved FFT bin. A static final-output plot, not the internal Auto EQ curve. Matched mode includes the constant matching gain.

What to listen for

Compare bass weight, chord body and percussion attack. A/B switching preserves audio position; a 20 ms crossfade reduces switching clicks. Both sources run on the same audio clock.

“Raw level” preserves rendered levels. “Matched loudness” uses a constant gain calculated from integrated loudness; it adds no compression.

Source and method

Original instrumental generated procedurally for Soundvex, without external recordings or samples. This is an illustrative demonstration, not a track from a station catalogue.

44.1 kHz stereo, 16-bit PCM WAV. Seconds 20–36 of a 36-second programme, with a common 5 ms boundary fade. Adaptive-leveling profile, bass +1.2 dB, AGC off, Bass EQ off, 2 dB reserve.

Measurements and provenance

MeasurementA · OFFB · POST
Raw LUFS-20.9 LUFS-20.8 LUFS
Raw true peak-3.9 dBTP-4.0 dBTP
Excerpt LRA0.9 LU1.1 LU
Matching gain0.0 dB-0.1 dB

R128/true peak measured with FFmpeg ebur128. LRA from a short excerpt does not characterize an entire programme. Spectrum uses 4096-sample Hann windows, hop 2048 and mean stereo power.

Exact render identity

auto-eq-original-groove-v2 · v2
Engine: 02ffb90ea2ff1f869fded45f07c4d3a63d2c5c5771f65c8af6addc0d4af6e337
A SHA-256: 877b287e75c33a35a835e135782eafcc31481e9f390c69721dcea24ca4b5f202
B SHA-256: aa7bff7945249afaa84e37bd9caeb4c792c90f4d55fa67f5da92e0a952b1579b

Read the full Auto EQ explanation →