The Simgot EM10 is 41.6Ω at 106.2 dB/mW; the Simgot EW300 is 28Ω at 105.5 dB/mW. This page covers what they ask of an amplifier, not how they sound.
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.
The EM10 is more demanding than 32% of the 567 non-electrostatic models in this database; the EW300 than 27%.
| dB SPL | EM10 power | EM10 voltage | EW300 power | EW300 voltage |
|---|---|---|---|---|
| 80 | 2.4 µW | 10 mV | 2.8 µW | 9 mV |
| 85 | 7.6 µW | 18 mV | 8.9 µW | 16 mV |
| 90 | 0.02 mW | 32 mV | 0.03 mW | 28 mV |
| 95 | 0.08 mW | 56 mV | 0.09 mW | 50 mV |
| 100 | 0.24 mW | 100 mV | 0.28 mW | 89 mV |
| 105 | 0.76 mW | 0.18 V | 0.89 mW | 0.16 V |
| Source | Price | Headroom, EM10 | Headroom, EW300 | Output impedance | Noise |
|---|---|---|---|---|---|
| JadeAudio JA11 | $20 | 19.8 dB | 19.7 dB | 0.5 Ω | 1.7 µV |
| FiiO KA11 | $29 | 28.1 dB | 28.6 dB | 0.7 Ω | 1.7 µV |
| FiiO BTR11 | $36 | 19.8 dB | 20.6 dB | 0.5 Ω | 8.0 µV |
Of the 280 sources here, 280 reach 100 dB on both. 69 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 69 is the JadeAudio JA11, at $20. It leaves 19.8 dB of headroom on the EM10 and 19.7 dB on the EW300, its output impedance is 0.5 Ω against a one-eighth limit of 5.20 Ω and 3.50 Ω, and its noise figure puts the hiss floor 15 dB and 14 dB below the 20 dB SPL this site treats as the point where a quiet room stops hiding it.
Both have a page of their own. In full: 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.