The Simgot EW300 is 28Ω at 105.5 dB/mW; the Simgot SuperMix 4 is 7.2Ω at 98.6 dB/mW. This page covers what they ask of an amplifier, not how they sound.
The SuperMix 4 needs 6.9 dB more than the EW300 to reach the same loudness — 1.4 mW against 0.28 mW.
| Specification | EW300 | SuperMix 4 |
|---|---|---|
| Impedance | 28 Ω | 7.2 Ω |
| Sensitivity | 105.5 dB/mW | 98.6 dB/mW |
| Sensitivity (voltage) | 121.0 dB/V | 120.0 dB/V |
| Power for 100 dB | 0.28 mW | 1.4 mW |
| Voltage for 100 dB | 89 mV | 100 mV |
| Current for 100 dB | 3.2 mA | 13.8 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 3.50 Ω | 0.90 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.
45 sources are low enough in output impedance for the EW300 under the one-eighth rule but not for the SuperMix 4 (FiiO SnowSky Tiny B, FiiO KA13, FiiO BTR15, 42 more).
280 of the 280 sources here reach 100 dB on both.
The SuperMix 4 is more demanding than 32% of the 567 non-electrostatic models in this database; the EW300 than 27%.
| dB SPL | EW300 power | EW300 voltage | SuperMix 4 power | SuperMix 4 voltage |
|---|---|---|---|---|
| 80 | 2.8 µW | 9 mV | 0.01 mW | 10 mV |
| 85 | 8.9 µW | 16 mV | 0.04 mW | 18 mV |
| 90 | 0.03 mW | 28 mV | 0.14 mW | 32 mV |
| 95 | 0.09 mW | 50 mV | 0.44 mW | 56 mV |
| 100 | 0.28 mW | 89 mV | 1.4 mW | 100 mV |
| 105 | 0.89 mW | 0.16 V | 4.4 mW | 0.18 V |
| Source | Price | Headroom, EW300 | Headroom, SuperMix 4 | Output impedance | Noise |
|---|---|---|---|---|---|
| JadeAudio JA11 | $20 | 19.7 dB | 6.9 dB | 0.5 Ω | 1.7 µV |
| FiiO KA11 | $29 | 28.6 dB | 19.0 dB | 0.7 Ω | 1.7 µV |
| FiiO BTR11 | $36 | 20.6 dB | 11.7 dB | 0.5 Ω | 8.0 µV |
Of the 280 sources here, 280 reach 100 dB on both. 45 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 45 is the JadeAudio JA11, at $20. It leaves 19.7 dB of headroom on the EW300 and 6.9 dB on the SuperMix 4, its output impedance is 0.5 Ω against a one-eighth limit of 3.50 Ω and 0.90 Ω, and its noise figure puts the hiss floor 14 dB and 15 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 EW300 and Simgot SuperMix 4. 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.