OLLO S4R EQ settings
Parametric EQ correction for the OLLO S4R, derived from measurements by oratory1990. It moves the measured frequency response toward a neutral target.
How the S4R sounds before EQ
Measured against a neutral target, the S4R comes out mid-forward. The mids sit ahead of both ends, so vocals lead everything.
The bass region, punch and bass lines, sits about 2.9 dB forward of neutral, so bass lines carry extra weight. The treble region, cymbals, sibilance and sparkle, sits about 2.1 dB behind neutral, so cymbals sound blunted. The lower mids region, warmth and the body of voices, sits about 2.1 dB behind neutral, so voices lose body and sound hollow. The sub-bass region, rumble and the weight under kick drums, sits about 2.0 dB behind neutral, so kick drums lose their weight.
The deviations are moderate, topping out around 2.9 dB, which is clearly audible in a direct comparison. EQ makes a worthwhile difference.
These figures are read from the correction itself: whatever the EQ lifts, the headphone lacked, and whatever it cuts, the headphone had too much of. The target is the community's neutral reference, and how far above 10 kHz you can trust any measurement varies by rig. More mid-forward models.
The correction curve
The solid line is the full measured correction (all 10 filters). The dashed line is what Atrium applies: the same shape at 65 percent strength, capped at 6 dB per band, so the headphone keeps its own character instead of being forced flat.
What the EQ fixes
The biggest moves in this correction, and what they do:
- The filter at 409 Hz lifts the lower mids by 9.7 dB with a medium-width band (Q 1.70).
- The filter at 188 Hz cuts the upper bass by 5.9 dB with a broad band (Q 0.48).
- The filter at 7.66 kHz lifts the treble by 4.9 dB with a narrow band (Q 3.00).
The preamp of -6.2 dB offsets the boosts so nothing clips at full volume.
Parametric EQ settings
Preamp: -6.2 dB (prevents clipping from the boosts below)
| # | Type | Frequency | Gain | Q |
|---|---|---|---|---|
| 1 | Low shelf | 105 Hz | +2.6 dB | 0.70 |
| 2 | Peaking | 188 Hz | -5.9 dB | 0.48 |
| 3 | Peaking | 409 Hz | +9.7 dB | 1.70 |
| 4 | Peaking | 2.06 kHz | -3.3 dB | 2.18 |
| 5 | Peaking | 7.66 kHz | +4.9 dB | 3.00 |
| 6 | High shelf | 1 kHz | -0.1 dB | 0.70 |
| 7 | Peaking | 36 Hz | +3.9 dB | 4.97 |
| 8 | Peaking | 51 Hz | -1.8 dB | 2.71 |
| 9 | Peaking | 3.96 kHz | -2.9 dB | 5.89 |
| 10 | Peaking | 3.18 kHz | +2.9 dB | 6.00 |
This is the full measured correction in AutoEq format. It pastes straight into Equalizer APO or Peace on Windows, and into most parametric EQ apps.
How to use these settings
Manually: enter the preamp and each filter into any parametric EQ. On Windows that is usually Equalizer APO with the Peace interface. On a Mac, eqMac or SoundSource. Set the type, frequency, gain and Q exactly as listed.
With Atrium: pick your S4R in the app and it applies a tuned version of this correction: 65 percent strength with a 6 dB per-band cap, which fixes the rough spots without erasing what the headphone does well. Atrium also measures how you hear with a short listening test and layers your personal hearing profile on top. Two people with the same headphones do not hear the same sound. Headphone corrections are part of Signature Edition; the app itself is free.
Headphones that sound similar
Closest matches across all 4,332 measured models, by distance between their deviation curves. Useful if you like how the S4R is tuned and want alternatives.