ASI6644 - PCI Express Sound Card   

The ASI6644 is a professional PCI-Express sound card designed for use in radio broadcast automation.

Providing 12 play streams that are mixed to 4 balanced stereo outputs and 8 record streams fed from four balanced stereo inputs, the ASI6644 features AudioScience’s unique “anything to anywhere” mixing and routing.

The ASI6644 provides both balanced analog and AES/EBU inputs and outputs. The maximum analog input and output level is +24dBu.

A choice of uncompressed PCM, MPEG layer 2 and MP3 is available for both recording and playback. All compression is handled by an on-board floating point DSP, allowing the host computer to focus on other tasks.

ASI6644 functionality includes MRX multi-rate mixing technology which allows streams of different sample-rates and formats to be mixed digitally. TSX time scaling allows compression/expansion of any or all playback streams in real time with no change in pitch.

For emerging surround sound applications, SSX mode allows multichannel streams of up to 8 channels to be played, recorded and mixed.


  • 12 mono/stereo streams of playback into 4 stereo outputs

  • 8 mono/stereo streams of record from 4 stereo inputs

  • PCM, MPEG-L2 and MP3 formats with sample rates to 96kHz

  • MRX technology supports mixing of multiple formats and rates

  • TSX time scaling by up to +/-20%

  • SSX mode for multichannel record, playback and mixing

  • Balanced stereo analog I/O with levels to +24dBu

  • 24bit ADC and DAC with 110dB DNR and 0.0015% THD+N

  • AES/EBU I/O with sample rate converters on all inputs

  • Dedicated AES/EBU and Word clock Sync input

  • Short length PCI card format (6.6 inches/168mm)

  • Up to 4 cards in one system

  • Windows 2000, XP and Linux software drivers available


ASI6644 Datasheet

Windows WAVE and WDM Driver
Linux HPI and ALSA Driver


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