The Oriolus Isabellae is 30Ω at 113.0 dB/mW; the Oriolus Szalayi is 10Ω at 110.0 dB/mW. This page covers what they ask of an amplifier, not how they sound.
The Szalayi needs 3.0 dB more than the Isabellae to reach the same loudness — 0.10 mW against 0.05 mW.
| Specification | Isabellae | Szalayi |
|---|---|---|
| Impedance | 30 Ω | 10 Ω |
| Sensitivity | 113.0 dB/mW | 110.0 dB/mW |
| Sensitivity (voltage) | 128.2 dB/V | 130.0 dB/V |
| Power for 100 dB | 0.05 mW | 0.10 mW |
| Voltage for 100 dB | 39 mV | 32 mV |
| Current for 100 dB | 1.3 mA | 3.2 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 3.75 Ω | 1.25 Ω |
| Sources that reach 100 dB out of 280 | 280 | 280 |
Every source in the database that drives one of them drives the other. On power, the choice between these two changes nothing about what amplifier you need.
8 sources are low enough in output impedance for the Isabellae under the one-eighth rule but not for the Szalayi (FiiO KA13, Schiit Vali 2+, Astell&Kern HC3, 5 more).
5 sources stay below the audible-hiss threshold with the Isabellae but cross it with the Szalayi (Fosi Audio SK02, FiiO M15S, FiiO K19, 2 more).
280 of the 280 sources here reach 100 dB on both.
The Isabellae is more demanding than 6% of the 567 non-electrostatic models in this database; the Szalayi than 4%.
| dB SPL | Isabellae power | Isabellae voltage | Szalayi power | Szalayi voltage |
|---|---|---|---|---|
| 80 | 0.5 µW | 4 mV | 1.0 µW | 3 mV |
| 85 | 1.6 µW | 7 mV | 3.2 µW | 6 mV |
| 90 | 5.0 µW | 12 mV | 0.01 mW | 10 mV |
| 95 | 0.02 mW | 22 mV | 0.03 mW | 18 mV |
| 100 | 0.05 mW | 39 mV | 0.10 mW | 32 mV |
| 105 | 0.16 mW | 69 mV | 0.32 mW | 56 mV |
| Source | Price | Headroom, Isabellae | Headroom, Szalayi | Output impedance | Noise |
|---|---|---|---|---|---|
| JadeAudio JA11 | $20 | 27.5 dB | 19.7 dB | 0.5 Ω | 1.7 µV |
| FiiO KA11 | $29 | 36.1 dB | 31.9 dB | 0.7 Ω | 1.7 µV |
| FiiO BTR13 | $59 | 33.0 dB | 28.8 dB | 0.6 Ω | 1.0 µV |
Of the 280 sources here, 280 reach 100 dB on both. 46 of them also publish an output impedance low enough for both under the one-eighth rule and a noise figure that stays below the audible-hiss threshold with both.
The cheapest of the 46 is the JadeAudio JA11, at $20. It leaves 27.5 dB of headroom on the Isabellae and 19.7 dB on the Szalayi, its output impedance is 0.5 Ω against a one-eighth limit of 3.75 Ω and 1.25 Ω, and its noise figure puts the hiss floor 7 dB and 5 dB below the 20 dB SPL this site treats as the point where a quiet room stops hiding it.
| Model | As printed | Tolerance | Standard |
|---|---|---|---|
| Isabellae | 10Hz〜40kHz | not printed | not printed |
| Szalayi | 10Hz~40kHz | not printed | not printed |
Oriolus prints 10Hz〜40kHz for the Isabellae and 10Hz~40kHz for the Szalayi.
Neither range has a tolerance printed beside it, so a wider range on one sheet is not deeper bass or more treble.
Not a measurement; maker by maker.
Both have a page of their own. In full: Oriolus Isabellae and Oriolus Szalayi. Every figure on this page comes from what Oriolus published, or is derived from it — what that maker publishes, counted.