Updated October 2026 · prices checked Oct 10, 2026.
Short answer: for most people the best portable headphone amp is a USB-C dongle, and the FiiO KA17 ($200) is the most capable one we recommend. If you want to keep the phone in your pocket, the FiiO BTR17 ($200) does the same job over Bluetooth. For IEMs, a $9 Apple dongle is all you need.
Up to ~650 mW into 32Ω balanced with external power, ~300 mW from phone power alone. Enough for an HE400SE with headroom.
Replaces the BTR7: Bluetooth receiver and USB DAC with 4.4mm balanced, ~300 mW portable / ~650 mW desktop mode into 32Ω.
The cheaper balanced dongle: ~240 mW into 32Ω from 4.4mm, ~130 mW from 3.5mm. Fine for IEMs, closed-backs and mid-sized planars.
About 1 V out on US units. If your headphone needs less than that (see the table), this is the whole answer.
What do your headphones actually need?
From each manufacturer’s sensitivity rating, for 110 dB peaks:
| Headphone | Needs | Apple dongle (~1 V) | Balanced dongle (KA3 / KA17) |
|---|---|---|---|
| IEMs (typical) | well under 0.5 V | Yes | Yes (use low gain) |
| ATH-M50x | ~0.7 V | Yes | Yes |
| HD 560S | ~1.0 V | Yes, no headroom | Yes |
| DT 770 Pro 80Ω | ~1.4 V | ~107 dB peaks | Yes |
| HE400SE | 1.4 V, 56 mA (80 mW) | No | Yes: 240–650 mW available |
| Sundara | 1.2 V, 33 mA (40 mW) | Marginal | Yes |
| HD 600 / HD 650 | 2.45 V | No | Check: 300Ω output not published |
Full table with 11 headphones: do I need a headphone amp?
The picks
FiiO KA17: most powerful dongle
The KA17 has 3.5mm and 4.4mm outputs and a second USB-C port. Plug a charger into that port and it switches to a “desktop mode” that raises balanced output to about 650 mW into 32Ω. On phone power alone it’s about 300 mW, still nearly four times what an HE400SE needs for 110 dB peaks. Retailer listings tend to quote the desktop-mode figure, so treat 300 mW as the real-world portable number.
FiiO BTR17: best Bluetooth option
FiiO’s current Bluetooth flagship and the replacement for the BTR7 we used to recommend. It receives Bluetooth from your phone, or works as a wired USB DAC, and drives wired headphones from 3.5mm or 4.4mm. Power is similar to the KA17: about 300 mW balanced into 32Ω in portable mode, about 650 mW in desktop mode (FiiO’s figure, as reported in Darko’s launch coverage), and about 140 mW single-ended. Bluetooth convenience costs battery life and a little fidelity versus a wired connection, so use USB at the desk.
FiiO KA3: the cheaper balanced dongle
An older, smaller FiiO dongle with a 4.4mm balanced output. About 240 mW into 32Ω balanced is plenty for IEMs, the DT 770 Pro 80Ω and an HE400SE at normal levels. It launched at about $90; check the current price.
Apple USB-C adapter: for IEMs and easy headphones
About $9 and roughly 1 V RMS on US units (EU units are volume-limited lower). With anything that needs 1 V or less, a pricier dongle mostly buys you a balanced jack and more gain.
Also worth a look: Qudelix 5K
A small Bluetooth receiver with LDAC and a parametric EQ app that owners on r/headphones often recommend for taming treble peaks on the go. It’s less powerful than the BTR17. I couldn’t confirm its current US price.
Who should not buy a portable amp
- HD 600, HD 650 and DT 990 Pro 250Ω owners listening at a desk. A compact desktop DAC/amp like the FiiO K11 R2R (~$170) has far more voltage. See DAC/amp combos under $200 .
- Wireless headphone owners. AirPods, Sony XM-series and similar have their own amps; a dongle has nothing to plug into.
What changed
- FiiO BTR7: still sold, but superseded by the BTR17. Old review: FiiO BTR7 .
- FiiO Q11, xDuoo XQ-50 Pro2 and XD-05 Plus, iBasso DC03 Pro: removed because I couldn’t confirm current US availability and prices.
- Corrected: the KA3’s balanced output is 4.4mm, not 2.5mm as an earlier version said.
Related: best IEMs under $100 · best amp for HE400SE · DT 770 80 vs 250Ω