The Dunu Glacier is 43Ω at 109.0 dB/mW; the Dunu Vulkan 2 is 35Ω at 113.0 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 Glacier needs 4.0 dB more than the Vulkan 2 to reach the same loudness — 0.13 mW against 0.05 mW.
| Specification | Glacier | Vulkan 2 |
|---|---|---|
| Impedance | 43 Ω | 35 Ω |
| Sensitivity | 109.0 dB/mW | 113.0 dB/mW |
| Sensitivity (voltage) | 122.7 dB/V | 127.6 dB/V |
| Power for 100 dB | 0.13 mW | 0.05 mW |
| Voltage for 100 dB | 74 mV | 42 mV |
| Current for 100 dB | 1.7 mA | 1.2 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 5.38 Ω | 4.38 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.
1 source is low enough in output impedance for the Glacier under the one-eighth rule but not for the Vulkan 2 (Shanling H5).
13 sources stay below the audible-hiss threshold with the Glacier but cross it with the Vulkan 2 (FiiO K11 R2R, Lake People G103-S Mk II, Lake People G111 Mk II, 10 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: Dunu Glacier and Dunu Vulkan 2. Every figure on this page comes from what Dunu published, or is derived from it — what that maker publishes, counted.