The Focal Clear is 55Ω at 104.0 dB/mW; the Focal Lensys Professional is 26Ω at 100.0 dB/mW. This page covers what they ask of an amplifier, not how they sound.
The Lensys Professional needs 4.0 dB more than the Clear to reach the same loudness — 1.0 mW against 0.40 mW.
| Specification | Clear | Lensys Professional |
|---|---|---|
| Impedance | 55 Ω | 26 Ω |
| Sensitivity | 104.0 dB/mW | 100.0 dB/mW |
| Sensitivity (voltage) | 116.6 dB/V | 115.9 dB/V |
| Power for 100 dB | 0.40 mW | 1.0 mW |
| Voltage for 100 dB | 0.15 V | 0.16 V |
| Current for 100 dB | 2.7 mA | 6.2 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 6.88 Ω | 3.25 Ω |
| Sources that reach 100 dB out of 280 | 280 | 280 |
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 Clear under the one-eighth rule but not for the Lensys Professional (Shanling H5).
280 of the 280 sources here reach 100 dB on both.
The Lensys Professional is more demanding than 51% of the 567 non-electrostatic models in this database; the Clear than 46%.
| dB SPL | Clear power | Clear voltage | Lensys Professional power | Lensys Professional voltage |
|---|---|---|---|---|
| 80 | 4.0 µW | 15 mV | 0.01 mW | 16 mV |
| 85 | 0.01 mW | 26 mV | 0.03 mW | 29 mV |
| 90 | 0.04 mW | 47 mV | 0.10 mW | 51 mV |
| 95 | 0.13 mW | 83 mV | 0.32 mW | 91 mV |
| 100 | 0.40 mW | 0.15 V | 1.0 mW | 0.16 V |
| 105 | 1.3 mW | 0.26 V | 3.2 mW | 0.29 V |
| Source | Price | Headroom, Clear | Headroom, Lensys Professional | Output impedance | Noise |
|---|---|---|---|---|---|
| JadeAudio JA11 | $20 | 16.4 dB | 13.9 dB | 0.5 Ω | 1.7 µV |
| FiiO KA11 | $29 | 24.7 dB | 23.2 dB | 0.7 Ω | 1.7 µV |
| FiiO BTR11 | $36 | 16.4 dB | 15.2 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 16.4 dB of headroom on the Clear and 13.9 dB on the Lensys Professional, its output impedance is 0.5 Ω against a one-eighth limit of 6.88 Ω and 3.25 Ω, and its noise figure puts the hiss floor 19 dB and 20 dB below the 20 dB SPL this site treats as the point where a quiet room stops hiding it.
| Model | As printed | Tolerance | Standard |
|---|---|---|---|
| Clear | 5Hz-28kHz | not printed | not printed |
| Lensys Professional | 5Hz - 22kHz | ±3 dB | not printed |
Focal prints 5Hz-28kHz for the Clear and 5Hz - 22kHz for the Lensys Professional.
Lensys Professional: Focal puts the tolerance in the row heading rather than beside the numbers: the label itself reads "Frequency response (+/- 3dB)".
Only one of the two is a specification. The range printed for the Lensys Professional comes with a tolerance; the one printed for the Clear does not, and a range without a ±dB figure says nothing about how loud that model is at either end of it. The two cannot be compared number against number, however similar they look in the table. Of the 490 models whose maker prints a range, 58 print the tolerance.
Not a measurement; maker by maker.
Both have a page of their own. In full: Focal Clear and Focal Lensys Professional. Every figure on this page comes from what Focal published, or is derived from it — what that maker publishes, counted.