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UA-25 USB Bus Powered Stereo Audio Interface

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A great cornerstone in your personal studio and a perfect field unit for traveling engineers. Unique onboard compression!

The Edirol UA-25 USB Bus Powered Stereo Audio Interface is easy to set up. It's a powerful USB Audio/MIDI interface designed to offer premium sound quality, rugged durability, and complete portability to the computer-based audio engineer. Compact enough to travel anywhere you can take your computer. High-grade aluminum chassis withstands hard knocks in the field and shields against high-frequency interference.

USB powered but provides 48V phantom power for condenser mics. Outputs audio at +4dBu from the balanced 1/4" outputs. Realtime direct monitoring. You can turn direct monitoring on or off, adjust the relative volume of the input signal compared to the audio playing out from your computer, and even set the signal to monitor in mono. This lets you plug a mic into the left input and hear it in both headphones or hear any phasing issues between inputs.

Built-in mild analog compressor protects against clipping and gives a little more latitude in field recording situations. 24-bit/96kHz audio performance, MIDI I/O, S/PDIF optical I/O, and Neutrik XLR/TRS inputs with high-grade microphone preamps. Super-stable drivers. ASIO2.0, WDM, MME, and CoreAudio support for both Mac & PC.

Reroute outgoing audio signals back to the input without crossing into the analog domain so you can record streaming audio directly.


  • Solid aluminum chassis - portable and durable
  • Premium audio quality
  • Wide variety of I/O ports
  • Built-in analog limiter
  • Zero latency direct monitoring
  • USB-powered phantom power preamps
  • +4 dBu output for professional applications

UA-25 USB Bus Powered Stereo Audio Interface Specifications:

  • Number of Audio Record/Playback Channels
  • Record: 1 pair of stereo
  • Playback: 1 pair of stereo
  • Full duplex (except for 96 kHz setting)
  • DIGITAL IN SWITCH = ON: Recording only
  • Signal Processing
  • PC interface:
  • 24 bits (ADVANCE SWITCH = OFF: 16 bits)
  • AD/DA Conversion:
  • 24 bits (linear)
  • Sampling Frequency
  • Digital output: 44.1/48/96 kHz
  • Digital input: 44.1/48/96 kHz
  • AD/DA Conversion: 44.1/48/96 kHz
  • * ADVANCE SWITCH = OFF: 44.1kHz only
  • Frequency Response
  • 96 kHz: 20 Hz to 40 kHz (+0 dB/-2 dB)
  • 48.0 kHz: 20 Hz to 22 kHz (+0 dB/-1 dB)
  • 44.1 kHz: 20 Hz to 20 kHz (+0 dB/-1 dB)
  • Nominal Input Level
  • Input Jack L, R (XLR type): -60 to -20 dBu
  • Input Jack L, R (1/4 inch TRS phone type): -36 to +4 dBu
  • Nominal Output Level
  • Output Jack L, R (1/4" TRS phone type): +4 dBu (balanced)
  • Output Jack L, R (RCA phono type): -2 dBu
  • Residual Noise Level
  • Output Jack: -96 dBu (S/N ratio: 105 dB)
  • (Input terminated with 1 k ohms, OUTPUT VOLUME: max., INPUT MONITOR: min., IHF-A, typ.)
  • Interface: USB
  • Digital input/output
  • Optical type (conforms to IEC60958 consumer format)
  • Connectors
  • Front Panel
  • Input Jack L, R
  • XLR type
  • (balanced, phantom power +48 V)
  • 1/4" TRS phone type (balanced) *
  • * Input Jack 2: high impedance is supported
  • Headphones Jack (Stereo 1/4 inch)
  • Rear Panel
  • Digital Input Connector (Optical type)
  • Digital Output Connector (Optical type)
  • Output Jack L, R
  • 1/4 inch TRS phone type (balanced)
  • RCA phono type
  • MIDI Connectors (IN/OUT)
  • USB Connector (B type)
  • Power Supply: USB Bus Power
  • Current Draw: 480 mA
  • Dimensions:
  • 164 (W) x 133 (D) x 46 (H) mm
  • 6-1/2 (W) x 5-1/4 (D) x 1-13/16 (H) in
  • Weight: 554 g / 1 lb 4 oz
  • Accessories
  • Owner's Manual
  • USB cable
  • CD-ROM
  • System Requirements
  • Macintosh
  • OS: Mac OS 9, 10.2 or later
  • Computer: Apple Macintosh series with on-board USB port
  • CPU/Clock: PowerPC G3 400 mhz or higher
  • Memory(RAM): 256MB or More
  • Hard Disk: 200 MB of free space.
  • Windows
  • OS: Microsoft Windows XP Home Edition/ XP Professional /2000 Professional /Me/98 Second Edition
  • Computer: Windows XP Compatible PC
  • CPU/Clock: Pentium, Celeron, or Pentium compatible processor 600MHz or higher.
  • Memory(RAM): 256MB or more
  • Hard Disk: 200 MB of free space.
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