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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.

Additional information

Weight 0.227 kg
Product can be split into multiple boxes


Ship Separately





Mini50 (SCSI-II type)

Input Level
-10 to +24dBu in 0.5dBu steps

Input Impedance
10K ohms

A/D converter
24bit oversampling

Output Level
-10 to +24dBu in 0.5dBu steps

D/A converter
24bit oversampling

Load Impedance
600ohms or greater

Dynamic Range [1]
>110dB (record or play)

THD+N [1]
<-96dB (0.0015%) (record or play)

Frequency Response
20Hz to 20kHz +0/-0.2dB

20Hz to 40kHz +0/-3dB

Inter-channel Phase
<0.1 degrees (record or play)

Inter-channel Crosstalk
>110dB (record or play)


AES/EBU (EIAJ CP-340 Type I / IEC-958 Professional)

Input/Output Impedance
110 ohms

Mini26 (SCSI-II type)

Sample Rates
32, 44.1, 48, 88.2 and 96kHz with sample rate converters on inputs


Internal (Adapter)
32, 44.1 48, 88.2 and 96kHz

AES/EBU Sync In [2]
32, 44.1 48, 88.2 and 96kHz on dedicated AES/EBU input

Word In [2]
32, 44.1 48, 88.2 and 96kHz

Word Out [2]
32, 44.1 48, 88.2 and 96kHz


Texas Instruments [email protected]


Audio Formats
8 bit unsigned PCM

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)


CBL1004: Mini 50 to Centronics 50 adapter.

CBL1044: Centronics 50 to 8 in and 8 out XLR.

Digital [2]
CBL1101: Mini 26 to Centronics 50 adapter.

CBL1144: Centronics 50 to 1 in, 4 out XLR, 1 BNC in, 1 BNC out (Word Clock).


32bit Universal PCI. PCI-X compatible.

PCI short-length form factor – 6.6" x 3.9" x 0.6" (168mm x 100mm x 15mm)

8 oz (227g) max

Operating Temperature
0C to 70C

Power Requirements
[email protected] +12V @ 300mA


4 or 12 stereo streams of playback into 4 stereo outputs
4 or 8 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 sample rates
TSX™ time scaling by up to +/-20%
SSX2™ mode for multichannel record, playback and mixing
Balanced stereo analog I/O with levels to +24dBu
24bit ADC and DAC with 110dB SNR and 0.0015% THD+N
AES/EBU I/O with sample rate converters on all inputs (ASI6544 only)
Dedicated AES/ABU and Word clock Sync input (ASI6544 only)
SoundGuard™ transient voltage suppression on all I/O
Sort length PCI card format (6.6 inches/168mm)
Up to 4 cards in one system
Windows 7, XP, Server 2008/2003, and Linux software drivers available


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STUDIO Soundcards AudioScience ASI6544 Sound Card