The Dunu Falcon Ultra is 16Ω at 108.0 dB (no reference unit printed); the Dunu Glacier is 43Ω at 109.0 dB/mW. This page covers what they ask of an amplifier, not how they sound.
The Falcon Ultra needs 1.0 dB more than the Glacier to reach the same loudness — 0.16 mW against 0.13 mW.
| Specification | Falcon Ultra | Glacier |
|---|---|---|
| Impedance | 16 Ω | 43 Ω |
| Sensitivity | 108.0 dB | 109.0 dB/mW |
| Sensitivity (voltage) | 126.0 dB/V | 122.7 dB/V |
| Power for 100 dB | 0.16 mW | 0.13 mW |
| Voltage for 100 dB | 50 mV | 74 mV |
| Current for 100 dB | 3.1 mA | 1.7 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 2.00 Ω | 5.38 Ω |
| Sources that reach 100 dB out of 280 | 280 | 280 |
One caution before reading the rows. Dunu Falcon Ultra printed a decibel figure with no reference unit, so this page reads it as per milliwatt. If it is really per volt, that model 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.
1 source is low enough in output impedance for the Glacier under the one-eighth rule but not for the Falcon Ultra (Shanling H5).
12 sources stay below the audible-hiss threshold with the Glacier but cross it with the Falcon Ultra (FiiO K11 R2R, Lake People G103-S Mk II, Schiit Valhalla 3, 9 more).
280 of the 280 sources here reach 100 dB on both.
The Glacier is more demanding than 23% of the 567 non-electrostatic models in this database; the Falcon Ultra than 11%.
| dB SPL | Falcon Ultra power | Falcon Ultra voltage | Glacier power | Glacier voltage |
|---|---|---|---|---|
| 80 | 1.6 µW | 5 mV | 1.3 µW | 7 mV |
| 85 | 5.0 µW | 9 mV | 4.0 µW | 13 mV |
| 90 | 0.02 mW | 16 mV | 0.01 mW | 23 mV |
| 95 | 0.05 mW | 28 mV | 0.04 mW | 41 mV |
| 100 | 0.16 mW | 50 mV | 0.13 mW | 74 mV |
| 105 | 0.50 mW | 90 mV | 0.40 mW | 0.13 V |
| Source | Price | Headroom, Falcon Ultra | Headroom, Glacier | Output impedance | Noise |
|---|---|---|---|---|---|
| JadeAudio JA11 | $20 | 19.8 dB | 22.5 dB | 0.5 Ω | 1.7 µV |
| FiiO KA11 | $29 | 31.9 dB | 30.7 dB | 0.7 Ω | 1.7 µV |
| FiiO BTR13 | $59 | 28.8 dB | 27.7 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 19.8 dB of headroom on the Falcon Ultra and 22.5 dB on the Glacier, its output impedance is 0.5 Ω against a one-eighth limit of 2.00 Ω and 5.38 Ω, and its noise figure puts the hiss floor 9 dB and 13 dB below the 20 dB SPL this site treats as the point where a quiet room stops hiding it.
| Model | As printed | Tolerance | Standard |
|---|---|---|---|
| Falcon Ultra | 5Hz-40kHz | not printed | not printed |
| Glacier | 5 Hz - 40 kHz | not printed | not printed |
Dunu prints 5Hz-40kHz for the Falcon Ultra and 5 Hz - 40 kHz for the Glacier.
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 Falcon Ultra and Dunu Glacier. 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.