The FiiO BTR13 is a Bluetooth receiver at $59. It delivers 100 mW into 32Ω and 10.0 mW into 300Ω, which ranks it 215 of 280 for raw power among the sources in this database.
Measured at 100 dB SPL it has comfortable headroom on 490 of the 567 dynamic and planar headphones catalogued here, enough but not generous on 64, only marginal on 11 and not enough power for 2. The cheap end of FiiO's Bluetooth line, with both jacks and a full published power table — rare at this price.
The manufacturer publishes 120 mW into 16Ω, 100 mW into 32Ω, 10 mW into 300Ω. The rest of the table is worked out from those.
The balanced output is rated separately: 220 mW into 32Ω through the 4.4mm jack.
Derived rows hold output voltage steady, as an amplifier does (method).
Source: fiio.com.
| Load | Power | Status | How it was arrived at |
|---|---|---|---|
| 16 Ω | 120 mW | Published | the manufacturer publishes this figure at this exact load |
| 32 Ω | 100 mW | Published | the manufacturer publishes this figure at this exact load |
| 150 Ω | 21 mW | Derived | worked out between two published loads, holding output voltage linear between them |
| 300 Ω | 10.0 mW | Published | the manufacturer publishes this figure at this exact load |
| 600 Ω | 5.0 mW | Derived | beyond the published loads, holding output voltage constant — which understates rather than flatters |
Easiest to hardest to drive, with headroom at a 100 dB SPL peak.
| Headphone | Impedance | Sensitivity | Needs | Headroom | Verdict |
|---|---|---|---|---|---|
| Shure SE846 | 9 Ω | 114.0 dB/mW | 0.04 mW | +32 dB | Comfortable audible hiss |
| 64 Audio U12t | 12.6 Ω | 108.0 dB/mW | 0.16 mW | +28 dB | Comfortable faint hiss |
| Shure SE215 | 17 Ω | 107.0 dB/mW | 0.20 mW | +28 dB | Comfortable faint hiss |
| Moondrop Aria | 32 Ω | 107.1 dB/mW | 0.19 mW | +27 dB | Comfortable faint hiss |
| Audeze LCD-X 2021 | 20 Ω | 103.0 dB/mW | 0.50 mW | +23 dB | Comfortable |
| Truthear Hexa | 20.5 Ω | 103.1 dB/mW | 0.49 mW | +23 dB | Comfortable |
| Sennheiser IE 200 | 18 Ω | 101.6 dB/mW | 0.69 mW | +22 dB | Comfortable |
| Sony MDR-7506 | 63 Ω | 106.0 dB/mW | 0.25 mW | +23 dB | Comfortable |
| Meze 99 Classics | 32 Ω | 103.0 dB/mW | 0.50 mW | +23 dB | Comfortable |
| Focal Clear MG | 55 Ω | 104.0 dB/mW | 0.40 mW | +22 dB | Comfortable |
| Philips SHP9500 | 32 Ω | 101.0 dB | 0.79 mW | +21 dB | Comfortable |
| Focal Utopia | 80 Ω | 104.0 dB/mW | 0.40 mW | +20 dB | Comfortable |
| Meze Empyrean | 32 Ω | 100.0 dB | 1.0 mW | +20 dB | Comfortable |
| Campfire Audio Andromeda 2020 | 9 Ω | 94.0 dB | 4.0 mW | +12 dB | Comfortable |
| Etymotic ER2SE | 15 Ω | 96.0 dB/mW | 2.5 mW | +17 dB | Comfortable |
| AKG K371 | 32 Ω | 99.1 dB/mW | 1.2 mW | +19 dB | Comfortable |
| Audio-Technica ATH-M50X | 38 Ω | 99.0 dB/mW | 1.3 mW | +18 dB | Comfortable |
| Beyerdynamic DT 900 Pro X | 48 Ω | 100.0 dB/mW | 1.0 mW | +18 dB | Comfortable |
| Audeze LCD-2 Classic | 70 Ω | 101.0 dB/mW | 0.79 mW | +18 dB | Comfortable |
| Grado SR80x | 38 Ω | 98.0 dB/mW | 1.6 mW | +17 dB | Comfortable |
| Sennheiser HD 560S | 120 Ω | 100.8 dB/mW | 0.83 mW | +15 dB | Comfortable |
| HiFiMAN Edition XS | 18 Ω | 92.0 dB | 6.3 mW | +13 dB | Comfortable |
| HiFiMAN Arya Stealth | 32 Ω | 94.0 dB | 4.0 mW | +14 dB | Comfortable |
| Dan Clark Audio AEON 2 Closed | 13 Ω | 90.0 dB/mW | 10 mW | +10 dB | Enough |
| Audeze LCD-5 | 14 Ω | 90.0 dB/mW | 10 mW | +10 dB | Comfortable |
| Beyerdynamic DT 1990 Pro (250Ω) | 250 Ω | 102.0 dB/mW | 0.63 mW | +13 dB | Comfortable |
| HiFiMAN HE400se | 25 Ω | 91.0 dB | 7.9 mW | +11 dB | Comfortable |
| HiFiMAN Sundara | 32 Ω | 92.0 dB | 6.3 mW | +12 dB | Comfortable |
| Dan Clark Audio Stealth | 23 Ω | 90.0 dB/mW | 10 mW | +10 dB | Comfortable |
| Fostex T50RP MK3 | 50 Ω | 92.0 dB/mW | 6.3 mW | +10 dB | Comfortable |
| AKG K702 | 62 Ω | 92.9 dB/mW | 5.1 mW | +10 dB | Enough |
| ZMF Verite Closed | 300 Ω | 99.0 dB/mW | 1.3 mW | +9 dB | Enough |
| Sennheiser HD 650 | 300 Ω | 97.8 dB/mW | 1.7 mW | +8 dB | Enough |
| Sennheiser HD 800S | 300 Ω | 96.8 dB/mW | 2.1 mW | +7 dB | Enough |
| Beyerdynamic DT 770 Pro (250Ω) | 250 Ω | 96.0 dB | 2.5 mW | +7 dB | Enough |
| Audio-Technica ATH-R70X | 470 Ω | 98.0 dB/mW | 1.6 mW | +6 dB | Enough |
| ZMF Atrium | 300 Ω | 96.0 dB/mW | 2.5 mW | +6 dB | Enough |
| Abyss AB-1266 Phi TC | 50 Ω | 88.0 dB/mW | 16 mW | +6 dB | Enough |
| Sennheiser HD 600 | 300 Ω | 91.8 dB/mW | 6.6 mW | +2 dB | Marginal |
| HiFiMAN Susvara | 60 Ω | 83.0 dB | 50 mW | +0 dB | Marginal |
At 1.0 µV of output noise, here is where that noise lands in the five most revealing in-ears in the database.
This one hisses. With the most sensitive in-ears in the database its own noise lands around 21 dB SPL, which you will hear between tracks and in quiet passages.
| In-ear | Impedance | Sensitivity | Hiss level |
|---|---|---|---|
| Simgot EA500 | 16 Ω | 141.0 dB/V | 21 dB SPL |
| Tanchjim EA FORCE | 17 Ω | 137.7 dB/V | 18 dB SPL |
| Shure SE846 | 9 Ω | 134.5 dB/V | 14 dB SPL |
| Campfire Audio Clara | 13.3 Ω | 134.1 dB/V | 14 dB SPL |
| 64 Audio Fourte | 10 Ω | 134.0 dB/V | 14 dB SPL |
At 0.6Ω output impedance, the one-eighth rule says this source suits headphones of 4.8Ω and above. 1 of the 567 models here falls below that. The one model below that line is the Symphonium Titan, and the mismatch tilts the frequency response audibly rather than subtly.
| As published | FiiO BTR13 |
|---|---|
| DAC | CS43131 x2 |
| Outputs | 3.5 mm, 4.4 mm balanced |
| Connection | USB-C (charging/data) |
| Bluetooth | QCC5125, Bluetooth 5.1; AAC/SBC/aptX/aptX LL/aptX Adaptive/aptX HD/LDAC |
| Formats | USB: PCM up to 96 kHz/16-bit |
| Battery | 460 mAh |
| Battery life | ≥8 h (3.5 mm or 4.4 mm, Bluetooth AAC, display off, EQ off, high gain, 32Ω) |
| Microphone | Bluetooth calls, built-in omnidirectional mic |
| Weight | 28.6 g |
| Dimensions | About 63.2 x 30 x 18.8 mm |
Copied from the makers’ own pages: fiio.com/BTR13_parameters. Battery life is the maker’s own test figure.
Nothing cheaper in this database does everything the FiiO BTR13 does. Of the 280 sources here, not one at a lower price will reach 100 dB on every headphone it reaches, stay inside the one-eighth rule wherever it does and stay under the audible-hiss threshold wherever it does. That is a plain result and it is not the usual one — most of the catalogue has something cheaper that matches it.
This counts the headphone output only; inputs, converters, the volume control and the build are outside it.
$50 · 138 mW into 32Ω · output Ω not published
Compare →$36 · 30 mW into 32Ω · 0.5 Ω out
Compare →$90 · 60 mW into 32Ω · 0.5 Ω out
Compare →$109 · 125 mW into 32Ω · 0.4 Ω out
Compare →$109 · 125 mW into 32Ω · 1.0 Ω out
Compare →$109 · 80 mW into 32Ω · 1.0 Ω out
Compare →Compared with its closest rivals: vs EarStudio ES100 MK2 · vs FiiO BTR11 · vs FiiO BTR15 · vs FiiO BTR17 · vs FiiO BTR5 2021 · vs FiiO BTR7 · vs Fosi Audio N3.