The HiFiMAN Arya Stealth is 32Ω at 94.0 dB (no reference unit printed); the HiFiMAN Susvara Unveiled is 45Ω at 86.0 dB (no reference unit printed). This page is only about what they ask of an amplifier — not how they sound, which no specification on either sheet can tell you.
The Susvara Unveiled needs 8.0 dB more than the Arya Stealth to reach the same loudness — 25 mW against 4.0 mW.
| Specification | Arya Stealth | Susvara Unveiled |
|---|---|---|
| Impedance | 32 Ω | 45 Ω |
| Sensitivity | 94.0 dB | 86.0 dB |
| Sensitivity (voltage) | 108.9 dB/V | 99.5 dB/V |
| Power for 100 dB | 4.0 mW | 25 mW |
| Voltage for 100 dB | 0.36 V | 1.06 V |
| Current for 100 dB | 11.2 mA | 23.6 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 4.00 Ω | 5.62 Ω |
| Sources that reach 100 dB out of 280 | 280 | 259 |
One caution before reading the rows. HiFiMAN Arya Stealth and HiFiMAN Susvara Unveiled printed a decibel figure with no reference unit, so this page reads it as per milliwatt. If it is really per volt, each of them needs far more than the table says. Why the two readings differ by so much.
21 of the 280 sources have the power for the Arya Stealth but not for the Susvara Unveiled — Apple USB-C dongle (US), Apple USB-C dongle (EU), JadeAudio JA11, 18 more.
1 source is low enough in output impedance for the Susvara Unveiled under the one-eighth rule but not for the Arya Stealth (Shanling H5).
259 of the 280 sources here reach 100 dB on both. That count is about power only — the output-impedance and hiss lines above are separate questions, and a source can pass this one and fail those.
Each model has a page of its own with the full source list, the hiss estimate and the provenance of every figure above: HiFiMAN Arya Stealth and HiFiMAN Susvara Unveiled. Each figure on this page is labelled on those pages with where it came from, including the ones HiFiMAN never published — what that maker publishes, counted.