The KZ AS16 Pro is 18Ω at 114.0 dB (no reference unit printed); the KZ PRX is 15Ω at 94.0 dB (no reference unit printed). This page covers what they ask of an amplifier, not how they sound.
The PRX needs 20.0 dB more than the AS16 Pro to reach the same loudness — 4.0 mW against 0.04 mW.
| Specification | AS16 Pro | PRX |
|---|---|---|
| Impedance | 18 Ω | 15 Ω |
| Sensitivity | 114.0 dB | 94.0 dB |
| Sensitivity (voltage) | 131.4 dB/V | 112.2 dB/V |
| Power for 100 dB | 0.04 mW | 4.0 mW |
| Voltage for 100 dB | 27 mV | 0.24 V |
| Current for 100 dB | 1.5 mA | 16.3 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 2.25 Ω | 1.88 Ω |
| Sources that reach 100 dB out of 280 | 280 | 280 |
One caution before reading the rows. KZ AS16 Pro and KZ PRX 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.
3 sources are low enough in output impedance for the AS16 Pro under the one-eighth rule but not for the PRX (Astell&Kern HC3, RME Fireface UFX II, RME Fireface UFX III).
32 sources stay below the audible-hiss threshold with the PRX but cross it with the AS16 Pro (Kiwi Ears Allegro Mini, FiiO BTR11, Fosi Audio SK02, 29 more).
280 of the 280 sources here reach 100 dB on both.
The PRX is more demanding than 66% of the 567 non-electrostatic models in this database; the AS16 Pro than 2%.
| dB SPL | AS16 Pro power | AS16 Pro voltage | PRX power | PRX voltage |
|---|---|---|---|---|
| 80 | 0.4 µW | 3 mV | 0.04 mW | 24 mV |
| 85 | 1.3 µW | 5 mV | 0.13 mW | 43 mV |
| 90 | 4.0 µW | 8 mV | 0.40 mW | 77 mV |
| 95 | 0.01 mW | 15 mV | 1.3 mW | 0.14 V |
| 100 | 0.04 mW | 27 mV | 4.0 mW | 0.24 V |
| 105 | 0.13 mW | 48 mV | 13 mW | 0.43 V |
| Source | Price | Headroom, AS16 Pro | Headroom, PRX | Output impedance | Noise |
|---|---|---|---|---|---|
| JadeAudio JA11 | $20 | 26.3 dB | 5.5 dB | 0.5 Ω | 1.7 µV |
| FiiO KA11 | $29 | 37.7 dB | 17.6 dB | 0.7 Ω | 1.7 µV |
| FiiO BTR13 | $59 | 34.6 dB | 14.5 dB | 0.6 Ω | 1.0 µV |
Of the 280 sources here, 280 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 26.3 dB of headroom on the AS16 Pro and 5.5 dB on the PRX, its output impedance is 0.5 Ω against a one-eighth limit of 2.25 Ω and 1.88 Ω, and its noise figure puts the hiss floor 4 dB and 23 dB below the 20 dB SPL this site treats as the point where a quiet room stops hiding it.
| Model | As printed | Tolerance | Standard |
|---|---|---|---|
| AS16 Pro | 20-40000Hz | not printed | not printed |
| PRX | 20-40000Hz | not printed | not printed |
KZ prints the same thing for both the AS16 Pro and the PRX: 20-40000Hz.
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: KZ AS16 Pro and KZ PRX. Each figure on this page is labelled on those pages with where it came from, including the ones KZ never published — what that maker publishes, counted.