The Westone MACH 10 is 80Ω at 103.0 dB (no reference unit printed); the Westone MACH 20 is 96Ω at 110.0 dB (no reference unit printed). This page covers what they ask of an amplifier, not how they sound.
The MACH 10 needs 7.0 dB more than the MACH 20 to reach the same loudness — 0.50 mW against 0.10 mW.
| Specification | MACH 10 | MACH 20 |
|---|---|---|
| Impedance | 80 Ω | 96 Ω |
| Sensitivity | 103.0 dB | 110.0 dB |
| Sensitivity (voltage) | 114.0 dB/V | 120.2 dB/V |
| Power for 100 dB | 0.50 mW | 0.10 mW |
| Voltage for 100 dB | 0.20 V | 98 mV |
| Current for 100 dB | 2.5 mA | 1.0 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 10.00 Ω | 12.00 Ω |
| Sources that reach 100 dB out of 280 | 280 | 280 |
One caution before reading the rows. Westone MACH 10 and Westone MACH 20 printed a decibel figure with no reference unit, so this page reads it as per milliwatt. If it is really per volt, each of them needs far more than the table says. Why the two readings differ by so much.
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.
7 sources are low enough in output impedance for the MACH 20 under the one-eighth rule but not for the MACH 10 (Focusrite Scarlett 4i4 4th gen, Zoom UAC-232, Focusrite Scarlett 16i16 (4th Gen), 4 more).
280 of the 280 sources here reach 100 dB on both.
The MACH 10 is more demanding than 59% of the 567 non-electrostatic models in this database; the MACH 20 than 31%.
| dB SPL | MACH 10 power | MACH 10 voltage | MACH 20 power | MACH 20 voltage |
|---|---|---|---|---|
| 80 | 5.0 µW | 20 mV | 1.0 µW | 10 mV |
| 85 | 0.02 mW | 36 mV | 3.2 µW | 17 mV |
| 90 | 0.05 mW | 63 mV | 0.01 mW | 31 mV |
| 95 | 0.16 mW | 0.11 V | 0.03 mW | 55 mV |
| 100 | 0.50 mW | 0.20 V | 0.10 mW | 98 mV |
| 105 | 1.6 mW | 0.36 V | 0.32 mW | 0.17 V |
| Source | Price | Headroom, MACH 10 | Headroom, MACH 20 | Output impedance | Noise |
|---|---|---|---|---|---|
| JadeAudio JA11 | $20 | 13.8 dB | 20.0 dB | 0.5 Ω | 1.7 µV |
| FiiO KA11 | $29 | 22.1 dB | 28.3 dB | 0.7 Ω | 1.7 µV |
| FiiO BTR11 | $36 | 13.7 dB | 19.9 dB | 0.5 Ω | 8.0 µV |
Of the 280 sources here, 280 reach 100 dB on both. 70 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 70 is the JadeAudio JA11, at $20. It leaves 13.8 dB of headroom on the MACH 10 and 20.0 dB on the MACH 20, its output impedance is 0.5 Ω against a one-eighth limit of 10.00 Ω and 12.00 Ω, and its noise figure puts the hiss floor 21 dB and 15 dB below the 20 dB SPL this site treats as the point where a quiet room stops hiding it.
| Model | As printed | Tolerance | Standard |
|---|---|---|---|
| MACH 10 | 20Hz – 18kHz | not printed | not printed |
| MACH 20 | 20Hz – 18kHz | not printed | not printed |
Westone prints the same thing for both the MACH 10 and the MACH 20: 20Hz – 18kHz.
Neither range has a tolerance printed beside it, so the matching numbers say little.
Not a measurement; maker by maker.
Both have a page of their own. In full: Westone MACH 10 and Westone MACH 20. Each figure on this page is labelled on those pages with where it came from, including the ones Westone never published — what that maker publishes, counted.