The Dunu SA6 MKII is 24Ω at 114.0 dB (no reference unit printed); the Dunu Vulkan is 15Ω at 109.0 dB (no reference unit printed). This page covers what they ask of an amplifier, not how they sound.
The Vulkan needs 5.0 dB more than the SA6 MKII to reach the same loudness — 0.13 mW against 0.04 mW.
| Specification | SA6 MKII | Vulkan |
|---|---|---|
| Impedance | 24 Ω | 15 Ω |
| Sensitivity | 114.0 dB | 109.0 dB |
| Sensitivity (voltage) | 130.2 dB/V | 127.2 dB/V |
| Power for 100 dB | 0.04 mW | 0.13 mW |
| Voltage for 100 dB | 31 mV | 43 mV |
| Current for 100 dB | 1.3 mA | 2.9 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 3.00 Ω | 1.88 Ω |
| Sources that reach 100 dB out of 280 | 280 | 280 |
One caution before reading the rows. Dunu SA6 MKII and Dunu Vulkan 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 SA6 MKII under the one-eighth rule but not for the Vulkan (Astell&Kern HC3, RME Fireface UFX II, RME Fireface UFX III).
9 sources stay below the audible-hiss threshold with the Vulkan but cross it with the SA6 MKII (Fosi Audio SK02, FiiO K7, FiiO Q15, 6 more).
280 of the 280 sources here reach 100 dB on both.
The Vulkan is more demanding than 8% of the 567 non-electrostatic models in this database; the SA6 MKII than 3%.
| dB SPL | SA6 MKII power | SA6 MKII voltage | Vulkan power | Vulkan voltage |
|---|---|---|---|---|
| 80 | 0.4 µW | 3 mV | 1.3 µW | 4 mV |
| 85 | 1.3 µW | 5 mV | 4.0 µW | 8 mV |
| 90 | 4.0 µW | 10 mV | 0.01 mW | 14 mV |
| 95 | 0.01 mW | 17 mV | 0.04 mW | 24 mV |
| 100 | 0.04 mW | 31 mV | 0.13 mW | 43 mV |
| 105 | 0.13 mW | 55 mV | 0.40 mW | 77 mV |
| Source | Price | Headroom, SA6 MKII | Headroom, Vulkan | Output impedance | Noise |
|---|---|---|---|---|---|
| JadeAudio JA11 | $20 | 27.5 dB | 20.5 dB | 0.5 Ω | 1.7 µV |
| FiiO KA11 | $29 | 37.3 dB | 32.6 dB | 0.7 Ω | 1.7 µV |
| FiiO BTR13 | $59 | 34.2 dB | 29.5 dB | 0.6 Ω | 1.0 µV |
Of the 280 sources here, 280 reach 100 dB on both. 47 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 47 is the JadeAudio JA11, at $20. It leaves 27.5 dB of headroom on the SA6 MKII and 20.5 dB on the Vulkan, its output impedance is 0.5 Ω against a one-eighth limit of 3.00 Ω and 1.88 Ω, and its noise figure puts the hiss floor 5 dB and 8 dB below the 20 dB SPL this site treats as the point where a quiet room stops hiding it.
| Model | As printed | Tolerance | Standard |
|---|---|---|---|
| SA6 MKII | 5 Hz - 40 kHz | not printed | not printed |
| Vulkan | 5 Hz – 40 kHz (HI-RES Certified) | not printed | not printed |
Dunu prints 5 Hz - 40 kHz for the SA6 MKII and 5 Hz – 40 kHz (HI-RES Certified) for the Vulkan.
Neither range has a tolerance printed beside it, so a wider range on one sheet is not deeper bass or more treble.
Not a measurement; maker by maker.
Both have a page of their own. In full: Dunu SA6 MKII and Dunu Vulkan. Each figure on this page is labelled on those pages with where it came from, including the ones Dunu never published — what that maker publishes, counted.