The Tangzu Li Zhi is 18Ω at 107.5 dB (no reference unit printed); the Tangzu Tianpeng is 9.8Ω at 104.0 dB (no reference unit printed). This page covers what they ask of an amplifier, not how they sound.
The Tianpeng needs 3.5 dB more than the Li Zhi to reach the same loudness — 0.40 mW against 0.18 mW.
| Specification | Li Zhi | Tianpeng |
|---|---|---|
| Impedance | 18 Ω | 9.8 Ω |
| Sensitivity | 107.5 dB | 104.0 dB |
| Sensitivity (voltage) | 124.9 dB/V | 124.1 dB/V |
| Power for 100 dB | 0.18 mW | 0.40 mW |
| Voltage for 100 dB | 57 mV | 62 mV |
| Current for 100 dB | 3.1 mA | 6.4 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 2.25 Ω | 1.23 Ω |
| Sources that reach 100 dB out of 280 | 280 | 280 |
One caution before reading the rows. Tangzu Li Zhi and Tangzu Tianpeng 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.
8 sources are low enough in output impedance for the Li Zhi under the one-eighth rule but not for the Tianpeng (FiiO KA13, Schiit Vali 2+, Astell&Kern HC3, 5 more).
3 sources stay below the audible-hiss threshold with the Tianpeng but cross it with the Li Zhi (Lake People G103-S Mk II, Violectric V222, Violectric V226).
280 of the 280 sources here reach 100 dB on both.
The Tianpeng is more demanding than 17% of the 567 non-electrostatic models in this database; the Li Zhi than 16%.
| dB SPL | Li Zhi power | Li Zhi voltage | Tianpeng power | Tianpeng voltage |
|---|---|---|---|---|
| 80 | 1.8 µW | 6 mV | 4.0 µW | 6 mV |
| 85 | 5.6 µW | 10 mV | 0.01 mW | 11 mV |
| 90 | 0.02 mW | 18 mV | 0.04 mW | 20 mV |
| 95 | 0.06 mW | 32 mV | 0.13 mW | 35 mV |
| 100 | 0.18 mW | 57 mV | 0.40 mW | 62 mV |
| 105 | 0.56 mW | 0.10 V | 1.3 mW | 0.11 V |
| Source | Price | Headroom, Li Zhi | Headroom, Tianpeng | Output impedance | Noise |
|---|---|---|---|---|---|
| JadeAudio JA11 | $20 | 19.8 dB | 13.6 dB | 0.5 Ω | 1.7 µV |
| FiiO KA11 | $29 | 31.2 dB | 25.8 dB | 0.7 Ω | 1.7 µV |
| FiiO BTR13 | $59 | 28.1 dB | 22.7 dB | 0.6 Ω | 1.0 µV |
Of the 280 sources here, 280 reach 100 dB on both. 58 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 58 is the JadeAudio JA11, at $20. It leaves 19.8 dB of headroom on the Li Zhi and 13.6 dB on the Tianpeng, its output impedance is 0.5 Ω against a one-eighth limit of 2.25 Ω and 1.23 Ω, and its noise figure puts the hiss floor 10 dB and 11 dB below the 20 dB SPL this site treats as the point where a quiet room stops hiding it.
| Model | As printed | Tolerance | Standard |
|---|---|---|---|
| Li Zhi | 20Hz-20.000kHz | not printed | not printed |
| Tianpeng | 20Hz-20kHz | not printed | not printed |
Tangzu prints 20Hz-20.000kHz for the Li Zhi and 20Hz-20kHz for the Tianpeng.
Li Zhi: Tangzu prints the top of the range as “20.000kHz”. As a decimal point that is 20 kHz; as a thousands separator it would be twenty megahertz. Either way the range it describes is the audible band and nothing beyond it.
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: Tangzu Li Zhi and Tangzu Tianpeng. Each figure on this page is labelled on those pages with where it came from, including the ones Tangzu never published — what that maker publishes, counted.