The AKG K702 is 62Ω at 92.9 dB/mW; the Audeze MM-500 is 18Ω at 100.0 dB/mW. This page is only about what they ask of an amplifier — not how they sound, which no specification on either sheet can tell you.
The AKG K702 needs 7.1 dB more than the Audeze MM-500 to reach the same loudness — 5.1 mW against 1.0 mW.
| Specification | AKG K702 | Audeze MM-500 |
|---|---|---|
| Impedance | 62 Ω | 18 Ω |
| Sensitivity | 92.9 dB/mW | 100.0 dB/mW |
| Sensitivity (voltage) | 105.0 dB/V | 117.4 dB/V |
| Power for 100 dB | 5.1 mW | 1.0 mW |
| Voltage for 100 dB | 0.56 V | 0.13 V |
| Current for 100 dB | 9.1 mA | 7.5 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 7.75 Ω | 2.25 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 AKG K702 under the one-eighth rule but not for the Audeze MM-500 (Shanling H5).
280 of the 280 sources here reach 100 dB on both. That count is about power only — the output-impedance and hiss lines above are separate questions, and a source can pass this one and fail those.
Each model has a page of its own with the full source list, the hiss estimate and the provenance of every figure above: AKG K702 and Audeze MM-500. Every figure on this page comes from what AKG and Audeze published, or is derived from it — what AKG publishes and what Audeze publishes, both counted.