USB Box S+ vs iFi Audio ZEN Air
The ZEN Air's output voltage is 1.0V RMS against the USB Box S+'s 2.1V RMS. Both share bit depth (32-bit) and max sample rate (384 kHz).
AI-generated product photo — not official manufacturer imagery.
DigitalDACsDiscontinued
Estimated price (community-sourced)
$78.76
Around — community and catalog average, updates slowly
About the USB Box S+
The Pro-Ject USB Box S+ is a USB-only digital-to-analog converter for computer audio. It uses an XMOS asynchronous USB interface and a Burr-Brown PCM5102A 32-bit delta-sigma DAC, supporting PCM/LPCM signals at sample rates from 44.1 kHz to 384 kHz. Incoming streams are upsampled to 352.8 kHz or 384 kHz, depending on the source rate. Two selectable filter characteristics are provided: Brick Wall and Apodizing. The unit has a 2.1 V RMS analog output through gold-plated RCA sockets and supports Windows, macOS, and Linux; Windows requires a dedicated USB driver, while macOS and Linux do not. Dolby Digital, DTS, and other bitstream formats are not supported. The compact metal enclosure follows Pro-Ject’s Box Design S-series styling.
Specifications
Digital Audio
DAC capabilities and digital audio processing
- Bit Depth
- 32-bit
- Max Sample Rate
- 384 kHz
- MQA Support
- No
- DAC Chip
- Burr-Brown PCM5102A
Analog Output
Analog signal output specifications
- Output Voltage
- 2.1V RMS
Connectivity
Input and output connections
- Bluetooth
- No
- Wi-Fi
- No
- Ethernet
- No
- Digital Inputs
- USB Type-B
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions