---
title: "Preciso"
description: "Dual mono DAC and preamp, with firmware update guide."
url: https://help.volumio.com/en/articles/66-preciso
collection: "User manuals"
updated: 2026-11-09
language: en
---

# Preciso

Dual mono DAC and preamp, with firmware update guide.

![Front and rear panels of the Volumio Preciso audio device, showing its display, controls, and audio and power connections. Visible: PRECISO, VOLUMIO, USB, 0.0dB, PCM 44.1kHz, BALANCED OUT.](https://staticfiles.gleap.io/ghelparticle/VNq4WbeVaPdCirowDhh9NLJQUydlc1JOdiQOGlEeRsCBUsaNPikmzII5rPGld2hzPY5MTvMqc6U.jpg)

Preciso is our high-precision dual mono DAC, built on two ESS Sabre chips, one per channel. Connect a streamer such as Rivo or Rivo Plus, a computer, a CD transport or a TV to its digital inputs, then connect it to your amplifier or active speakers. With its hardware gain control you can also use it as a preamp and connect power amplifiers directly.

[**Preciso** - User manual (EN)](https://heyzine.com/flip-book/6c3f46dc41.html)

## Specifications

-   DAC: two ESS Sabre ES9039Q2M in a dual mono layout, with an ultra-low phase noise MEMS clock.
    
-   I/V output stage based on Texas Instruments OPA1612A.
    
-   THD -128 dB, THD+N -122.5 dB, SNR 128 dB.
    
-   8 selectable digital filters and switchable NOS mode for PCM input.
    
-   Preamp mode with hardware gain control, from 0 dB to -99 dB.
    
-   Balanced XLR output at 4 Vrms and unbalanced RCA output at 2 Vrms.
    
-   USB and I2S over HDMI inputs up to PCM 768 kHz/32 bit and DSD512.
    
-   Coaxial and optical S/PDIF inputs up to PCM 192 kHz/24 bit.
    
-   Separate linear regulators for the analog and digital sections.
    
-   1.3" OLED display showing gain, input and audio format, and two knobs with push-button.
    
-   Dimensions: 27 × 15 × 5 cm.
    

### Connectivity

-   USB Type-B digital input, driverless on most Windows and macOS computers.
    
-   I2S/DSD over HDMI digital input.
    
-   Coaxial (RCA) and optical (TOSLINK) S/PDIF digital inputs.
    
-   Balanced XLR and unbalanced RCA analog outputs.
    
-   12V trigger input and output (3.5 mm jacks), to switch Preciso on from another device or switch other devices on.
    
-   IR receiver, for the Volumio Remoto remote control (sold separately).
    
-   5V DC power input.
    

### In the box

Preciso, a 5V/3A power supply with 4 plug adapters (EU, US, UK, AU/NZ), and a USB cable.

## Firmware Update

To update the firmware on Preciso, first [download the latest UF2 image](https://drive.google.com/file/d/1TpACwzbPf-6t5GlFnbpaxQQx5-W7HxBN).  
Then follow these steps:

1.  Unplug the power supply.
    
2.  Press and hold the right knob.
    
3.  Plug the power supply back in.
    
4.  As soon as the “MCU UPDATE MODE” page appears on the display, release the knob.
    
5.  Connect the device to a PC/Mac via USB; it will be detected as a mass storage device.
    
6.  The firmware file needs to be copied into mass memory.
    
7.  After a few seconds, the device will automatically restart once the update is complete.
    

### Releases

**v1.3.4**  
Update LED color map.

**v1.3.3**  
Fix for DAC filter selection with SPDIF inputs.

**v1.3.2**  
Fix for device not starting up after connecting the PSU in some rare circumstances.  
Fix for IR receiver stuck in some rare circumstances.

**v1.3.1**  
Add transition from standby to active when pressing the MUTE button on the IR remote.

**v1.3.0**  
Add channel swap option for I2S and/or DSD.

**v1.2.4**  
Add NOS mode option (active only on PCM input).  
Add support for Volumio Remote.  
Fix pop noise issue on track skip for USB input.

**v1.0.3**  
First public release.