Short answer: the Fosi Audio K7. It ranks #26 of 43 DAC and headphone amp combos by measured performance, rated 4.1/5, at $199.99; the Qudelix T71 ranks #32, rated 3.8/5, and costs $229, so there is little reason to consider the other one.
The case for the Fosi Audio K7: Audio Science Review measured a SINAD of 116 dB, so its noise and distortion are inaudible. The catch: Fosi Audio doesn’t publish a 32 ohm power figure, so its headroom for hard to drive headphones is unclear.
Why pick the Qudelix T71: Audio Science Review measured 110 dB SINAD, clean enough for nearly all listening. The tradeoff: The maker does not publish a 32 ohm power figure, so it is hard to judge how well it drives demanding headphones.
Buy the Fosi Audio K7. It is rated higher than the Qudelix T71 and costs less, so only choose the other one for a particular feature it does better.
Still deciding? The full Headphone Amps and DACs rankings cover every ranked option.
Specifications Side By Side
| Fosi Audio K7 | Qudelix T71 | |
|---|---|---|
| Price | $199.99 | $229.00 |
| Ranked | #26 of 43 in DAC and Headphone Amp Combos | #32 of 43 in DAC and Headphone Amp Combos |
| Device Type | DAC and headphone amp | DAC and headphone amp |
| SINAD | 116 dB (measured by Audio Science Review) | 110 dB (measured by Audio Science Review) |
| Headphone Outputs | 3.5 mm, 4.4 mm balanced | 3.5 mm, 2.5 mm balanced, 4.4 mm balanced |
| Balanced Output | Yes (4.4 mm) | Yes (2.5 mm, 4.4 mm) |
| Inputs | USB-C, optical, coaxial, Bluetooth, 3.5 mm mic | USB-C |
| Outputs | RCA | - |
| Bluetooth Codecs | SBC, aptX HD, aptX LL | - |
| DAC Chip | AK4493SEQ | 4 x ES9219C |
| Volume Control | Hardware knob | - |
| Equalizer | Yes (bass and treble knobs) | Yes (20-band parametric/graphic) |
| Battery Life | - | 4 to 10 hours |
| Dimensions | - | 3.3” x 1.6” x 0.6” (84 x 40 x 16 mm) |
| Weight | - | 0.2 lbs (75 g) |
Related Amp and DAC Comparisons
More top alternatives to Fosi Audio K7:
- Fosi Audio ZH3 vs Fosi Audio K7
- SMSL DS20 vs Fosi Audio K7
- Schiit Magni Unity with Mesh DAC vs Fosi Audio K7
- Khadas Tone2 Pro vs Fosi Audio K7
- SMSL D12 vs Fosi Audio K7
Prices on this page were last checked October 11, 2026 at 4:59 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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The Two Amps and DACs In Full
Fosi Audio K7: $199.99 Amazon eBay
Pros: Audio Science Review measured a SINAD of 116 dB, so its noise and distortion are inaudible. It is unusually flexible for the money, with USB, optical, coaxial and Bluetooth inputs (SBC, aptX HD, aptX LL), RCA line out, a 4.4 mm balanced headphone jack, a microphone input and bass and treble knobs.
Cons: Fosi Audio doesn’t publish a 32 ohm power figure, so its headroom for hard to drive headphones is unclear. The SMSL DS20 rates higher for a little less, and the Fosi Audio SK02 rates slightly higher for much less. Its Bluetooth lacks AAC and LDAC.
Full Fosi Audio K7 review and specifications →
| Released | Apr 2025 (1 year ago) |
|---|---|
| Balanced Output | Yes (4.4 mm) |
| Bluetooth Codecs | SBC, aptX HD, aptX LL |
| DAC Chip | AK4493SEQ |
| Device Type | DAC and headphone amp |
| Equalizer | Yes (bass and treble knobs) |
| Headphone Outputs | 3.5 mm, 4.4 mm balanced |
| Inputs | USB-C, optical, coaxial, Bluetooth, 3.5 mm mic |
| Outputs | RCA |
| SINAD | 116 dB (measured by Audio Science Review) |
| Volume Control | Hardware knob |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Qudelix T71: $229.00 Qudelix eBay
Pros: Audio Science Review measured 110 dB SINAD, clean enough for nearly all listening. A built in 20 band parametric or graphic equalizer lets you tune your headphones, and it offers 3.5 mm plus 2.5 mm and 4.4 mm balanced outputs. Its battery runs 4 to 10 hours, and it weighs 75 g.
Cons: The maker does not publish a 32 ohm power figure, so it is hard to judge how well it drives demanding headphones. USB-C is the only input. The Loxjie D30 rates higher and measured cleaner for less.
Full Qudelix T71 review and specifications →
| Released | 2023 (3 years ago) |
|---|---|
| Balanced Output | Yes (2.5 mm, 4.4 mm) |
| Battery Life | 4 to 10 hours |
| DAC Chip | 4 x ES9219C |
| Device Type | DAC and headphone amp |
| Dimensions | 3.3” x 1.6” x 0.6” (84 x 40 x 16 mm) |
| Equalizer | Yes (20-band parametric/graphic) |
| Headphone Outputs | 3.5 mm, 2.5 mm balanced, 4.4 mm balanced |
| Inputs | USB-C |
| SINAD | 110 dB (measured by Audio Science Review) |
| Weight | 0.2 lbs (75 g) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons