iFi audio uno DAC and Headphone Amplifier User Manual
Thank you for purchasing the UNO. The UNO is a USB-audio DAC amplifier.
Product Overview
EQ mode selection
This button selects the following EQ modes. The colour of the EQ mode LED on top (item 6) indicates the selection.
PowerMatch
PowerMatch setting should be off for IEMs and on for on/over-ear headphones.
Warning: Due to the high power of UNO, before changing the PowerMatch setting, always start off at a low volume level so that there is no risk of damage to your headphones, speakers or your hearing. iFi audio is not responsible for any hearing or equipment damage from misuse.
Power ON/OFF and Volume control
This is the power switch and volume control knob.
Audio Format LED (kHz)]
The LED colour scheme indicates the audio format and sampling frequency received by UNO from the music source.
| LED | Mode |
| Green | PCM 44.1/48/88.2/96kHz |
| Yellow | PCM 176.4/192/352.8/384kHz |
| Cyan | DSD 64/128 |
| Blue | DSD 256 |
| Magenta | MQA |
S-Balanced 3.5mm headphone output
Connect 3.5mm stereo headphones. Compatible with both TRS and TRRS confiurations.
EQ mode LED
The LED colour scheme indicates the UNO’s EQ mode, please see item 1.
RCA analogue Line output
Connect analogue RCA interconnects to an amplifier.
USB-C audio and power input
This is a USB-C input. It connects UNO to the computer or phone audio source and can also be powered by it.
Plays up to 32-bit 384kHz PCM, DSD256 and is an MQA renderer.
Note: For use with PC it is necessary to download drivers.
Tip: For the required driver and all the latest firmware updates please visit our website: https://ifi-audio.com/download-hub/
Specification
| Digital Input: | USB-C |
| Formats: | DSD 256 /11.3MHz |
| DXD 384kHz | |
| PCM 384kHz | |
| MQA | |
| DAC: | Bit-Perfect DSD & DXD DAC by ESS |
| Line Section Output: | 2V max |
| Output Impedance: | <100Ω |
| SNR: | ≥119dBA |
| DNR: | ≥115dB @ 0dBFS |
| THD+N: | ≤0.03% @ 0dBFS |
| Headphone Section Output: | ≥2.6V / 3.5V max. at 32 Ω / 300 Ω |
| Output Power: | ≥211mW @ 32Ω; 39mW @ 300Ω |
| Output Impedance: | <1Ω |
| SNR: | ≥113dBA |
| DNR: | ≥110dB @ 0dBFS |
| THD+N: | ≤0.02% (1.27V @ 16Ω) |
| Channel separation: | ≥80dB (1kHz/600Ω) |
| Frequency Response: | 10-80kHz(-0.5dB) |
| Power supply requirement: | USB-C 5V/0.5A |
| Power consumption: | No Signal ~0.8W |
| Max Signal ~1.5W | |
| Dimensions: | 92 g (0.2 lbs) |
| Limited Warranty: | 12 months* |
*12 months typical or as permitted/required by local reseller laws.
**Specifications are subject to change without notice.
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