Home Production & Sound Cards Stereo Sound Card VX221e-SRC
  • Overview
  • Specifications

Stereo Sound Card VX221e-SRC

Key Workflow: Linear PCM stereo sound card for professional stereo audio workstations

VX221e-SRC is a professional linear (PCM) stereo sound card based on the PCI Express bus interface. It is designed for use in any professional PC-based audio system running under Windows and requiring AES/EBU connectivity.

At a glance

VX221e-SRC is the reference stereo PCM sound card designed for operating in continuous 24/7/365 use-environments as part of professional audio systems. It can be used with software applications based on standard driver interfaces such as WDM Kernel streaming, DirectSound,  Wasapi, and ASIO for Windows. It features an AES3 input with high quality hardware sample rate converters.

  • Developed for the broadcast industry
  • Designed for AES/EBU only systems
  • Interoperable with most of the third party software applications for audio production under Windows

Key features

  • Stereo Linear PCM card
  • PCI Express bus interface
  • One AES/EBU input/output, with high quality hardware sample rate converter on the input.
  • Adjustable input and output digital gains
  • On-board 3-band parametric EQ and Maximizer effects
  • Support for Windows 32-bit and 64-bit versions (Wasapi, DirectSound, ASIO)
  • Breakout cables with XLR connectors for audio connectivity




Bus/Format: PCI EXPRESS™ (PCIe®) x1 (x2, x4, x8, x16 compatible)
Size: 168 mm x 99 mm x 20 mm
Power requirements (+3.3V/ +12V): 1 A / 0.2 A
Operating: temp / humidity (non-condensing): 0°C / +50°C • 5% / 90%
Storage: temp / humidity (non-condensing): -5°C / +70°C • 0% / 95%


Digital inputs (stereo): 1 AES/EBU with hardware sample rate converter (SRC); conversion ratio from 1:8 to 7,5:1
Programmable digital input gain: from –110 dB to +18 dB


Digital outputs (stereo): 1 AES/EBU, up to 200 kHz
Programmable digital output gain:  from –110 dB to +18 dB
Other output:  1 stereo headphone output (600 Ω


Internal connector: inter-board synchronization
External connectors:
– 15-pin HD Sub-D for digital I/Os
– 1 mini jack headphone stereo output (3.5 mm TRS female jack)

Audio specifications

Sampling frequencies available: Programmable from 32  to 192 kHz
Supported audio formats: PCM (8, 16, 24 bits), Float IEEE754

Sample rate converter performance

Maximum frequency: 192 kHz
Frequency ratio: from 1:8 to 7,5:1
THD + noise 1 kHz at –2 dBfs: <-130 dB

Development environments

OS supported: Windows versions from Windows 7 and Windows server 2008 R2 (32-bit and 64-bit versions), Linux
API under Windows:  WASAPI, ASIO, DirectSound, Digigram proprietary “np” SDK
Main on-board processing features (accessible through the Digigram “np” SDK): PCM play & rec, Float IEEE754,direct monitoring, real-time mixing, level adjustment, panning, cross-fade, punch-in/punch-out, scrubbing, 3-band parametric equalizer, maximizer, frequency conversions



  • Low OPEX: low failure rate and high reliability
  • Low TCO & future-proofed
  • Ongoing product support: from Digigram and its Development Partners