The JBL Quantum One is 32Ω at 95.0 dB/mW; the JBL Tour One M2 is 32Ω at 117.0 dB/mW. This page covers what they ask of an amplifier, not how they sound.
The Quantum One needs 22.0 dB more than the Tour One M2 to reach the same loudness — 3.2 mW against 0.02 mW.
| Specification | Quantum One | Tour One M2 |
|---|---|---|
| Impedance | 32 Ω | 32 Ω |
| Sensitivity | 95.0 dB/mW | 117.0 dB/mW |
| Sensitivity (voltage) | 109.9 dB/V | 131.9 dB/V |
| Power for 100 dB | 3.2 mW | 0.02 mW |
| Voltage for 100 dB | 0.32 V | 25 mV |
| Current for 100 dB | 9.9 mA | 0.8 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 4.00 Ω | 4.00 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.
34 sources stay below the audible-hiss threshold with the Quantum One but cross it with the Tour One M2 (Kiwi Ears Allegro Mini, FiiO BTR11, Fosi Audio SK02, 31 more).
280 of the 280 sources here reach 100 dB on both.
The Quantum One is more demanding than 77% of the 567 non-electrostatic models in this database; the Tour One M2 than 2%.
| dB SPL | Quantum One power | Quantum One voltage | Tour One M2 power | Tour One M2 voltage |
|---|---|---|---|---|
| 80 | 0.03 mW | 32 mV | 0.2 µW | 3 mV |
| 85 | 0.10 mW | 57 mV | 0.6 µW | 4 mV |
| 90 | 0.32 mW | 0.10 V | 2.0 µW | 8 mV |
| 95 | 1.0 mW | 0.18 V | 6.3 µW | 14 mV |
| 100 | 3.2 mW | 0.32 V | 0.02 mW | 25 mV |
| 105 | 10 mW | 0.57 V | 0.06 mW | 45 mV |
| Source | Price | Headroom, Quantum One | Headroom, Tour One M2 | Output impedance | Noise |
|---|---|---|---|---|---|
| JadeAudio JA11 | $20 | 9.8 dB | 31.8 dB | 0.5 Ω | 1.7 µV |
| FiiO KA11 | $29 | 18.0 dB | 40.0 dB | 0.7 Ω | 1.7 µV |
| FiiO BTR13 | $59 | 15.0 dB | 37.0 dB | 0.6 Ω | 1.0 µV |
Of the 280 sources here, 280 reach 100 dB on both. 40 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 40 is the JadeAudio JA11, at $20. It leaves 9.8 dB of headroom on the Quantum One and 31.8 dB on the Tour One M2, its output impedance is 0.5 Ω against a one-eighth limit of 4.00 Ω for both, and its noise figure puts the hiss floor 25 dB and 3 dB below the 20 dB SPL this site treats as the point where a quiet room stops hiding it.
| Model | As printed | Tolerance | Standard |
|---|---|---|---|
| Quantum One | 20Hz – 40kHz | not printed | not printed |
| Tour One M2 | 10 Hz - 40 kHz (passive) | not printed | not printed |
| 10 Hz - 22 kHz (active) | not printed | not printed |
JBL prints 20Hz – 40kHz for the Quantum One and two ranges, “10 Hz - 40 kHz (passive)” and “10 Hz - 22 kHz (active)”, for the Tour One M2.
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: JBL Quantum One and JBL Tour One M2. Every figure on this page comes from what JBL published, or is derived from it — what that maker publishes, counted.