The Simgot EM10 is 41.6Ω at 106.2 dB/mW; the Simgot EW300 is 28Ω at 105.5 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 EW300 needs 0.7 dB more than the EM10 to reach the same loudness — 0.28 mW against 0.24 mW.
| Specification | EM10 | EW300 |
|---|---|---|
| Impedance | 41.6 Ω | 28 Ω |
| Sensitivity | 106.2 dB/mW | 105.5 dB/mW |
| Sensitivity (voltage) | 120.0 dB/V | 121.0 dB/V |
| Power for 100 dB | 0.24 mW | 0.28 mW |
| Voltage for 100 dB | 100 mV | 89 mV |
| Current for 100 dB | 2.4 mA | 3.2 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 5.20 Ω | 3.50 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 EM10 under the one-eighth rule but not for the EW300 (Shanling H5).
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: Simgot EM10 and Simgot EW300. Each figure on this page is labelled on those pages with where it came from, including the ones Simgot never published — what that maker publishes, counted.