The FiiO FT3 (32Ω) is 32Ω at 95.1 dB/mW; the FiiO JT1 is 32Ω at 88.1 dB/mW. This page covers what they ask of an amplifier, not how they sound.
The JT1 needs 7.0 dB more than the FT3 (32Ω) to reach the same loudness — 15 mW against 3.1 mW.
| Specification | FT3 (32Ω) | JT1 |
|---|---|---|
| Impedance | 32 Ω | 32 Ω |
| Sensitivity | 95.1 dB/mW | 88.1 dB/mW |
| Sensitivity (voltage) | 110.0 dB/V | 103.0 dB/V |
| Power for 100 dB | 3.1 mW | 15 mW |
| Voltage for 100 dB | 0.31 V | 0.70 V |
| Current for 100 dB | 9.8 mA | 22.0 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 | 278 |
2 of the 280 sources have the power for the FT3 (32Ω) but not for the JT1 — Apple USB-C dongle (EU), Steinberg UR22C.
278 of the 280 sources here reach 100 dB on both.
The JT1 is more demanding than 93% of the 567 non-electrostatic models in this database; the FT3 (32Ω) than 76%.
| dB SPL | FT3 (32Ω) power | FT3 (32Ω) voltage | JT1 power | JT1 voltage |
|---|---|---|---|---|
| 80 | 0.03 mW | 31 mV | 0.15 mW | 70 mV |
| 85 | 0.10 mW | 56 mV | 0.49 mW | 0.13 V |
| 90 | 0.31 mW | 99 mV | 1.5 mW | 0.22 V |
| 95 | 0.98 mW | 0.18 V | 4.9 mW | 0.40 V |
| 100 | 3.1 mW | 0.31 V | 15 mW | 0.70 V |
| 105 | 9.8 mW | 0.56 V | 49 mW | 1.25 V |
| Source | Price | Headroom, FT3 (32Ω) | Headroom, JT1 | Output impedance | Noise |
|---|---|---|---|---|---|
| JadeAudio JA11 | $20 | 9.9 dB | 2.9 dB | 0.5 Ω | 1.7 µV |
| FiiO KA11 | $29 | 18.1 dB | 11.1 dB | 0.7 Ω | 1.7 µV |
| FiiO BTR11 | $36 | 9.9 dB | 2.9 dB | 0.5 Ω | 8.0 µV |
Of the 280 sources here, 278 reach 100 dB on both. 70 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 70 is the JadeAudio JA11, at $20. It leaves 9.9 dB of headroom on the FT3 (32Ω) and 2.9 dB on the JT1, 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 32 dB below the 20 dB SPL this site treats as the point where a quiet room stops hiding it.
| Model | As printed | Tolerance | Standard |
|---|---|---|---|
| FT3 (32Ω) | nothing printed | — | — |
| JT1 | 15Hz-30KHz | not printed | not printed |
FiiO prints nothing at all for the FT3 (32Ω). FiiO's German distributor shop lists 15Hz-30KHz for the JT1. That figure stands on FiiO's German distributor shop, not on a document published by the maker.
FT3 (32Ω): FiiO has one FT3 page and it is the 350 Ω version: it prints "Frequency response: 7Hz-40kHz" beside "Impedance: 350Ω". No page of their own covers the 32 Ω FT3, so there is no range printed for this variant — which is not the same as FiiO printing nothing for the FT3.
So one side of this comparison has a frequency-response number and the other does not — which changes less than it looks. The range printed for the JT1 comes with no tolerance beside it, and a range without a ±dB figure says nothing about how loud the headphone is at either end of it: thirty decibels down at the bottom and the sentence would still be true. On the only reading that would have made it a specification, the two sheets say the same amount: nothing.
Not a measurement; maker by maker.
Both have a page of their own. In full: FiiO FT3 (32Ω) and FiiO JT1. Each figure on this page is labelled on those pages with where it came from, including the ones FiiO never published — what that maker publishes, counted.