The Meze 109 Pro is 40Ω at 112.0 dB/mW; the Meze STRADA is 40Ω at 111.0 dB/mW. This page covers what they ask of an amplifier, not how they sound.
The STRADA needs 1.0 dB more than the 109 Pro to reach the same loudness — 0.08 mW against 0.06 mW.
| Specification | 109 Pro | STRADA |
|---|---|---|
| Impedance | 40 Ω | 40 Ω |
| Sensitivity | 112.0 dB/mW | 111.0 dB/mW |
| Sensitivity (voltage) | 126.0 dB/V | 125.0 dB/V |
| Power for 100 dB | 0.06 mW | 0.08 mW |
| Voltage for 100 dB | 50 mV | 56 mV |
| Current for 100 dB | 1.3 mA | 1.4 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 5.00 Ω | 5.00 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.
5 sources stay below the audible-hiss threshold with the STRADA but cross it with the 109 Pro (FiiO M33 R2R, SPL Phonitor se, SPL Phonitor xe, 2 more).
280 of the 280 sources here reach 100 dB on both.
The STRADA is more demanding than 14% of the 567 non-electrostatic models in this database; the 109 Pro than 11%.
| dB SPL | 109 Pro power | 109 Pro voltage | STRADA power | STRADA voltage |
|---|---|---|---|---|
| 80 | 0.6 µW | 5 mV | 0.8 µW | 6 mV |
| 85 | 2.0 µW | 9 mV | 2.5 µW | 10 mV |
| 90 | 6.3 µW | 16 mV | 7.9 µW | 18 mV |
| 95 | 0.02 mW | 28 mV | 0.03 mW | 32 mV |
| 100 | 0.06 mW | 50 mV | 0.08 mW | 56 mV |
| 105 | 0.20 mW | 89 mV | 0.25 mW | 0.10 V |
| Source | Price | Headroom, 109 Pro | Headroom, STRADA | Output impedance | Noise |
|---|---|---|---|---|---|
| JadeAudio JA11 | $20 | 25.8 dB | 24.8 dB | 0.5 Ω | 1.7 µV |
| FiiO KA11 | $29 | 34.0 dB | 33.0 dB | 0.7 Ω | 1.7 µV |
| FiiO BTR13 | $59 | 31.0 dB | 30.0 dB | 0.6 Ω | 1.0 µV |
Of the 280 sources here, 280 reach 100 dB on both. 57 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 57 is the JadeAudio JA11, at $20. It leaves 25.8 dB of headroom on the 109 Pro and 24.8 dB on the STRADA, its output impedance is 0.5 Ω against a one-eighth limit of 5.00 Ω for both, and its noise figure puts the hiss floor 9 dB and 10 dB below the 20 dB SPL this site treats as the point where a quiet room stops hiding it.
| Model | As printed | Tolerance | Standard |
|---|---|---|---|
| 109 Pro | 5 Hz - 30 kHz | not printed | not printed |
| STRADA | 5 Hz - 30 kHz | not printed | not printed |
Meze prints the same thing for both the 109 Pro and the STRADA: 5 Hz - 30 kHz.
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: Meze 109 Pro and Meze STRADA. Every figure on this page comes from what Meze published, or is derived from it — what that maker publishes, counted.