HD 25 Reference
For the Sennheiser HD 25 · Reference · AutoEq via OPRA
Neutral
Response curve10 bands · ±9 dB
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Measurement-derived reference tuning for the Sennheiser HD 25. Profile by AutoEQ, measured by Rtings, and distributed through OPRA under CC BY-SA 4.0.
AutoEq via OPRA
Reference source- Profile
- AutoEQ
- Measured by
- Rtings
- Target
- AutoEq default over-ear target
Converted to Spectra filter names; frequency, gain, and Q values are unchanged. The source preamp is replaced by Spectra automatic headroom after response verification.
Parametric bands10 active
| Type | Freq | Gain | Q |
|---|---|---|---|
| Low Shelf | 105 Hz | +6.7 | — |
| Peak | 235 Hz | -4.9 | 0.39 |
| Peak | 597 Hz | +5.8 | 1.00 |
| Peak | 5.3 kHz | +7.3 | 1.74 |
| Peak | 8.5 kHz | -6.0 | 1.20 |
| High Shelf | 10 kHz | +4.5 | — |
| Peak | 56 Hz | +0.8 | 2.17 |
| Peak | 91 Hz | -1.1 | 2.60 |
| Peak | 176 Hz | +0.8 | 2.47 |
| Peak | 279 Hz | -0.6 | 2.16 |
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