The Moondrop Blessing 3 is 14.8Ω at 101.7 dB/mW; the Shure SE215 is 17Ω at 107.0 dB/mW. 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 Moondrop Blessing 3 needs 5.3 dB more than the Shure SE215 to reach the same loudness — 0.68 mW against 0.20 mW.
| Specification | Moondrop Blessing 3 | Shure SE215 |
|---|---|---|
| Impedance | 14.8 Ω | 17 Ω |
| Sensitivity | 101.7 dB/mW | 107.0 dB/mW |
| Sensitivity (voltage) | 120.0 dB/V | 124.7 dB/V |
| Power for 100 dB | 0.68 mW | 0.20 mW |
| Voltage for 100 dB | 0.10 V | 58 mV |
| Current for 100 dB | 6.8 mA | 3.4 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 1.85 Ω | 2.12 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.
3 sources are low enough in output impedance for the Shure SE215 under the one-eighth rule but not for the Moondrop Blessing 3 (Astell&Kern HC3, RME Fireface UFX II, RME Fireface UFX III).
8 sources stay below the audible-hiss threshold with the Moondrop Blessing 3 but cross it with the Shure SE215 (FiiO BTR11, FiiO K11 R2R, Lake People G103-S Mk II, 5 more).
280 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: Moondrop Blessing 3 and Shure SE215. Every figure on this page comes from what Moondrop and Shure published, or is derived from it — what Moondrop publishes and what Shure publishes, both counted.