The ASI6544 and ASI6540 are professional PCI sound cards 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 4 balanced stereo inputs, the ASI6544 and ASI6540 both feature AudioScience’s unique “anything to anywhere” mixing and routing.
The ASI6544 provides both balanced analog and AES/EBU inputs and outputs. The ASI6540 has analog I/O only. 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.
ASI6544 and ASI6540 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, SSX2™ mode allows multichannel streams of up to 8 channels to be played, recorded and mixed.
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Dynamic Range 
20Hz to 40kHz +0/-3dB
DIGITAL INPUT/OUTPUT 
SAMPLE RATE CLOCK
AES/EBU Sync In 
Word In 
Word Out 
16 bit signed PCM
32 bit floating point PCM
MPEG-1 Layer 2
MPEG-1 Layer 3 (MP3) (MPEG Layer-3 audio coding technology licensed from Fraunhofer IIS and THOMSON multimedia)
BREAKOUT CABLES (NOT INCLUDED
CBL1044: Centronics 50 to 8 in and 8 out XLR.
CBL1144: Centronics 50 to 1 in, 4 out XLR, 1 BNC in, 1 BNC out (Word Clock).
4 or 12 stereo streams of playback into 4 stereo outputs