The Moondrop Aria is 32Ω at 107.1 dB/mW; the Moondrop Armature Art 24 is 5.8Ω at 96.6 dB/mW. This page covers what they ask of an amplifier, not how they sound.
The Armature Art 24 needs 10.5 dB more than the Aria to reach the same loudness — 2.2 mW against 0.19 mW.
| Specification | Aria | Armature Art 24 |
|---|---|---|
| Impedance | 32 Ω | 5.8 Ω |
| Sensitivity | 107.1 dB/mW | 96.6 dB/mW |
| Sensitivity (voltage) | 122.0 dB/V | 119.0 dB/V |
| Power for 100 dB | 0.19 mW | 2.2 mW |
| Voltage for 100 dB | 79 mV | 0.11 V |
| Current for 100 dB | 2.5 mA | 19.4 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 4.00 Ω | 0.72 Ω |
| Sources that reach 100 dB out of 280 | 280 | 279 |
1 of the 280 sources has the power for the Aria but not for the Armature Art 24 — Steinberg UR22C.
49 sources are low enough in output impedance for the Aria under the one-eighth rule but not for the Armature Art 24 (FiiO SnowSky Tiny B, FiiO KA13, FiiO KA15, 46 more).
2 sources stay below the audible-hiss threshold with the Armature Art 24 but cross it with the Aria (FiiO BTR11, Rupert Neve RNHP).
279 of the 280 sources here reach 100 dB on both.
The Armature Art 24 is more demanding than 37% of the 567 non-electrostatic models in this database; the Aria than 25%.
| dB SPL | Aria power | Aria voltage | Armature Art 24 power | Armature Art 24 voltage |
|---|---|---|---|---|
| 80 | 1.9 µW | 8 mV | 0.02 mW | 11 mV |
| 85 | 6.2 µW | 14 mV | 0.07 mW | 20 mV |
| 90 | 0.02 mW | 25 mV | 0.22 mW | 36 mV |
| 95 | 0.06 mW | 44 mV | 0.69 mW | 63 mV |
| 100 | 0.19 mW | 79 mV | 2.2 mW | 0.11 V |
| 105 | 0.62 mW | 0.14 V | 6.9 mW | 0.20 V |
| Source | Price | Headroom, Aria | Headroom, Armature Art 24 | Output impedance | Noise |
|---|---|---|---|---|---|
| JadeAudio JA11 | $20 | 21.9 dB | 4.0 dB | 0.5 Ω | 1.7 µV |
| FiiO KA11 | $29 | 30.1 dB | 16.1 dB | 0.7 Ω | 1.7 µV |
| FiiO BTR13 | $59 | 27.1 dB | 13.0 dB | 0.6 Ω | 1.0 µV |
Of the 280 sources here, 279 reach 100 dB on both. 41 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 41 is the JadeAudio JA11, at $20. It leaves 21.9 dB of headroom on the Aria and 4.0 dB on the Armature Art 24, its output impedance is 0.5 Ω against a one-eighth limit of 4.00 Ω and 0.72 Ω, and its noise figure puts the hiss floor 13 dB and 16 dB below the 20 dB SPL this site treats as the point where a quiet room stops hiding it.
| Model | As printed | Tolerance | Standard |
|---|---|---|---|
| Aria | 5Hz-36kHz | not printed | not printed |
| 20Hz-20kHz | not printed | not printed | |
| Armature Art 24 | 7Hz-35kHz | not printed | not printed |
| 20Hz-20kHz (IEC60318-4, -3dB) | -3 dB | IEC60318-4 |
Moondrop prints two ranges, “5Hz-36kHz” and “20Hz-20kHz”, for the Aria and two ranges, “7Hz-35kHz” and “20Hz-20kHz (IEC60318-4, -3dB)”, for the Armature Art 24.
Only one of the two is a specification. The range printed for the Armature Art 24 comes with a tolerance; the one printed for the Aria does not, and a range without a ±dB figure says nothing about how loud that model is at either end of it. The two cannot be compared number against number, however similar they look in the table. Of the 490 models whose maker prints a range, 58 print the tolerance.
Not a measurement; maker by maker.
Both have a page of their own. In full: Moondrop Aria and Moondrop Armature Art 24. Every figure on this page comes from what Moondrop published, or is derived from it — what that maker publishes, counted.