The Sendy Audio Apollo is 16Ω at 95.0 dB (no reference unit printed); the Sendy Audio Peacock is 50Ω at 103.0 dB (no reference unit printed). This page covers what they ask of an amplifier, not how they sound.
The Apollo needs 8.0 dB more than the Peacock to reach the same loudness — 3.2 mW against 0.50 mW.
| Specification | Apollo | Peacock |
|---|---|---|
| Impedance | 16 Ω | 50 Ω |
| Sensitivity | 95.0 dB | 103.0 dB |
| Sensitivity (voltage) | 113.0 dB/V | 116.0 dB/V |
| Power for 100 dB | 3.2 mW | 0.50 mW |
| Voltage for 100 dB | 0.22 V | 0.16 V |
| Current for 100 dB | 14.1 mA | 3.2 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 2.00 Ω | 6.25 Ω |
| Sources that reach 100 dB out of 280 | 280 | 280 |
One caution before reading the rows. Sendy Audio Apollo and Sendy Audio Peacock 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.
1 source is low enough in output impedance for the Peacock under the one-eighth rule but not for the Apollo (Shanling H5).
280 of the 280 sources here reach 100 dB on both.
The Apollo is more demanding than 63% of the 567 non-electrostatic models in this database; the Peacock than 49%.
| dB SPL | Apollo power | Apollo voltage | Peacock power | Peacock voltage |
|---|---|---|---|---|
| 80 | 0.03 mW | 22 mV | 5.0 µW | 16 mV |
| 85 | 0.10 mW | 40 mV | 0.02 mW | 28 mV |
| 90 | 0.32 mW | 71 mV | 0.05 mW | 50 mV |
| 95 | 1.0 mW | 0.13 V | 0.16 mW | 89 mV |
| 100 | 3.2 mW | 0.22 V | 0.50 mW | 0.16 V |
| 105 | 10 mW | 0.40 V | 1.6 mW | 0.28 V |
| Source | Price | Headroom, Apollo | Headroom, Peacock | Output impedance | Noise |
|---|---|---|---|---|---|
| JadeAudio JA11 | $20 | 6.8 dB | 15.8 dB | 0.5 Ω | 1.7 µV |
| FiiO KA11 | $29 | 18.9 dB | 24.1 dB | 0.7 Ω | 1.7 µV |
| FiiO BTR11 | $36 | 11.5 dB | 15.8 dB | 0.5 Ω | 8.0 µV |
Of the 280 sources here, 280 reach 100 dB on both. 69 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 69 is the JadeAudio JA11, at $20. It leaves 6.8 dB of headroom on the Apollo and 15.8 dB on the Peacock, its output impedance is 0.5 Ω against a one-eighth limit of 2.00 Ω and 6.25 Ω, and its noise figure puts the hiss floor 22 dB and 19 dB below the 20 dB SPL this site treats as the point where a quiet room stops hiding it.
| Model | As printed | Tolerance | Standard |
|---|---|---|---|
| Apollo | 20Hz - 40KHz | not printed | not printed |
| Peacock | 20Hz - 40KHz | not printed | not printed |
Sendy Audio prints the same thing for both the Apollo and the Peacock: 20Hz - 40KHz.
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: Sendy Audio Apollo and Sendy Audio Peacock. Each figure on this page is labelled on those pages with where it came from, including the ones Sendy Audio never published — what that maker publishes, counted.