Uno
interface_dac
$79
Used market: $45*
Specifications
3 of 10 values have a recorded source- Type
- DAC/Amp Combo·
- Bus Powered
- yes·
- Max Gain dB
- 0·
- Analog Inputs
- ·
- Analog Outputs
- 3.5mm Headphones, RCA Line Out·
- Digital Inputs
- USB-C·
- Min Usb Power W
- 1.5✓
- Headphone Output
- Max Power mW: 211 · Max Voltage Vrms: 3.42 · At Impedance ohms: 32·
- Max Sample Rate kHz
- 384·
- Phantom Power Provided
- no·
Expert Audio Engineering Commentary
Headroom Notes
iFi never prints a headphone voltage for the Uno, so the number here comes from the 300-ohm power rating, where the amplifier is voltage-limited: 39 mW into 300 ohms is 3.42 V. At 32 ohms the same amplifier manages 211 mW, which is 2.6 V — it runs out of current, not voltage, on low-impedance loads. Output impedance is not published at all.
What the datasheet actually says
Quoted verbatim from the manufacturer’s own page, with the date we checked it. We state what is printed, not what anyone intended by it.
«OUTPUT 2V max.»
The row says OUTPUT 2V max. without naming which output, while the row two lines below reads RMS OUTPUT POWER, Headphone Section: >=211mW @ 32Ω; 39mW @ 300Ω. Those power figures require 2.6 V and 3.42 V respectively, so 2 V cannot be the headphone ceiling; 2 V is the standard level of the RCA line output. Taken as the headphone figure it would understate the Uno by more than 4 dB.
checked 8/5/2026* Estimated with the depreciation fallback (~57% retained value). · checked on 8/5/2026