The Shure AONIC 3 is 26Ω at 108.0 dB/mW; the Shure SE425 is 22Ω at 109.0 dB/mW. This page covers what they ask of an amplifier, not how they sound.
The AONIC 3 needs 1.0 dB more than the SE425 to reach the same loudness — 0.16 mW against 0.13 mW.
| Specification | AONIC 3 | SE425 |
|---|---|---|
| Impedance | 26 Ω | 22 Ω |
| Sensitivity | 108.0 dB/mW | 109.0 dB/mW |
| Sensitivity (voltage) | 123.9 dB/V | 125.6 dB/V |
| Power for 100 dB | 0.16 mW | 0.13 mW |
| Voltage for 100 dB | 64 mV | 53 mV |
| Current for 100 dB | 2.5 mA | 2.4 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 3.25 Ω | 2.75 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.
10 sources stay below the audible-hiss threshold with the AONIC 3 but cross it with the SE425 (Lake People G103-S Mk II, Schiit Valhalla 3, FiiO M33 R2R, 7 more).
280 of the 280 sources here reach 100 dB on both.
The AONIC 3 is more demanding than 19% of the 567 non-electrostatic models in this database; the SE425 than 13%.
| dB SPL | AONIC 3 power | AONIC 3 voltage | SE425 power | SE425 voltage |
|---|---|---|---|---|
| 80 | 1.6 µW | 6 mV | 1.3 µW | 5 mV |
| 85 | 5.0 µW | 11 mV | 4.0 µW | 9 mV |
| 90 | 0.02 mW | 20 mV | 0.01 mW | 17 mV |
| 95 | 0.05 mW | 36 mV | 0.04 mW | 30 mV |
| 100 | 0.16 mW | 64 mV | 0.13 mW | 53 mV |
| 105 | 0.50 mW | 0.11 V | 0.40 mW | 94 mV |
| Source | Price | Headroom, AONIC 3 | Headroom, SE425 | Output impedance | Noise |
|---|---|---|---|---|---|
| JadeAudio JA11 | $20 | 21.9 dB | 22.1 dB | 0.5 Ω | 1.7 µV |
| FiiO KA11 | $29 | 31.2 dB | 32.4 dB | 0.7 Ω | 1.7 µV |
| FiiO BTR13 | $59 | 28.1 dB | 29.3 dB | 0.6 Ω | 1.0 µV |
Of the 280 sources here, 280 reach 100 dB on both. 57 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 57 is the JadeAudio JA11, at $20. It leaves 21.9 dB of headroom on the AONIC 3 and 22.1 dB on the SE425, its output impedance is 0.5 Ω against a one-eighth limit of 3.25 Ω and 2.75 Ω, and its noise figure puts the hiss floor 12 dB and 10 dB below the 20 dB SPL this site treats as the point where a quiet room stops hiding it.
| Model | As printed | Tolerance | Standard |
|---|---|---|---|
| AONIC 3 | 20 Hz –18.5 kHz | not printed | not printed |
| SE425 | 20 Hz–19 kHz | not printed | not printed |
Shure prints 20 Hz –18.5 kHz for the AONIC 3 and 20 Hz–19 kHz for the SE425.
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: Shure AONIC 3 and Shure SE425. Every figure on this page comes from what Shure published, or is derived from it — what that maker publishes, counted.