AudioConnect™ 8×8
Scalable, High-Performance Audio Measurement Interface for high channel count applications
8×8 analog in/out audio measurement interface with 2 S/PDIF, microphone power and TEDS compatibility. 
Overview
Introduction
AudioConnect 8×8 is Listen’s first 8-in, 8-out audio measurement interface. Designed specifically for precision audio measurements, it delivers high-resolution performance and ease of use – perfect for the lab, field, or production line. It is uniquely scalable to 32 synchronized channels over a single USB C cable for high channel count audio measurement applications.
Feature Overview
- 8 Analog Inputs with TEDS support and microphone power, 8 Analog Outputs and 2 digital S/PDIF channels
- Up to 192 kHz sample rate for high-resolution measurements
- Selectable gain (-20 to +30 dB) with level and overload indicators
- Input channel monitoring via headphone/loudspeaker for live signal review
- Up to 4 units can be connected for up to 32 synchronized inputs and outputs on one USB C cable
- Controlled via SoundCheck for error-free operation, seamless integration and automatic configuration and calibration
Inputs and Outputs
AudioConnect 8×8 has 8 analog inputs and 8 analog outputs. With a sampling rate up to 192kHz, it is ideal for high resolution measurements on a range of devices. All analog inputs support TEDS and feature both constant voltage and constant current microphone power for use with a wide range of input devices including SCM and IEPE microphones, head and torso simulators, couplers and artificial mouths. This eliminates the need for additional microphone power supplies and ensures excellent ground loop immunity. Selectable gain with level and overload indicators ensures measurement accuracy and clearly highlights any signal issues. 2 S/PDIF channels are also available for digital signals and master digital clock synchronization. Input channels can be monitored via headphones or loudspeaker for live signal review.
Expandable to 32 Channels
AudioConnect 8×8 is the first dedicated audio measurement interface expandable to 32 synchronized input and output channels. Up to 3 additional units can be connected via HDMI cables to a master unit. This increases the channel count while ensuring accurate time synchronization via the master unit. Used with a 32 or 64 channel version of SoundCheck, this makes an extremely powerful multichannel audio analysis system suitable for applications such as automotive audio, or where large microphone arrays are used to capture data.
Error-Proof Operation
Unlike other 8 channel audio interfaces, AudioConnect 8×8 has no knobs or switches – it is entirely controlled by SoundCheck. This means all settings are defined in the test sequence or through the software interface, and it is impossible to accidentally change controls such as gain. Autoranging – an exclusive SoundCheck feature – automatically configures the gain based on the signal to ensure optimum signal-to-noise ratio for your measurements. BNC connectors provide a secure connection and prevent loose cables.
Automatic Configuration
Configuration with SoundCheck® (version 23 and higher) is quick and seamless. Simply connect the interface to the computer using the USB-C cable, and it automatically reads calibration tables from the device firmware, configures the input channels in the software with sampling rate, Vp, calibration values etc., and runs a self-test. Setup is further streamlined with TEDS support to automatically identify and read data from TEDS microphones and accelerometers.
Watch Demo
Setup Diagram
Example Application of an AudioConnect 8×8 Audio Measurement Interface
Specifications
USB Audio Interface
USB 2.0, Windows and macOS HID compliant
USB Audio Class 2 (macOS, Windows)
ASIO low-latency audio driver (Windows only)
Sample Rates: 44.1, 48, 88.2, 96, 176.4 & 192 kHz
Bit depth: 24 bits
USB-C physical connector
Mic/Line Inputs
Connectors: 8 BNC
Frequency Response (all sample rates): 20 Hz to 20 kHz +0.1/-0.4 dB;
Frequency Response (192k sample rate):10 Hz to 90 kHz +0.1/ -2.0 dB
Maximum Input Level: 20 Vp (14 Vrms) at -20 dB gain
Input Impedance: 100 kΩ
THD+N (44.1k sample rate): -99 dB (0.0011%) typical at -1 dBFS, 20 Hz to 20 kHz bandwidth
THD+N (192k sample rate): -96 dB (0.0016%) typical at -1 dBFS, 20 Hz to 40 kHz bandwidth
Gain Settings: -20, 0, +10, +20, +30 dB ±0.25 dB
Equivalent Input Noise: <12 uV @ 0 dB Gain, 20 Hz to 20 kHz bandwidth
Inter-channel Phase: ±0.5°, 20 Hz to 20 kHz
Crosstalk: -100 dB at 10 kHz, 0 dB gain setting
Bias Settings: Off / SCM / IEPE
SCM (Electret) Bias: 10 VDC, 7.5 kΩ
IEPE Bias: 28 VDC @ 4 mA constant current
TEDS Support for IEPE transducers per IEEE 1451.4
Line Outputs
Connectors: 8 BNC
Maximum Output Level: 4 Vp (2.82 Vrms)
Frequency Response (all sample rates): 20 Hz to 20 kHz ± 0.1 dB;
Frequency Response (192k sample rate): 10 Hz to 90 kHz +0.1, -2.0 dB
THD+N (44.1k sample rate): -103 dB (0.0007%) typical at -1 dBFS, 20 Hz to 20 kHz bandwidth
THD+N (192k sample rate): -100 dB (0.0010%) typical at -1 dBFS, 20 Hz to 40 kHz bandwidth
Inter-channel Phase*: ± 0.25°, 20 Hz to 20 kHz
Crosstalk: -100 dB at 10 kHz
Digital Audio I/O
S/PDIF: 2 channels in, 2 channels out, supports up to 192 kHz sample rate
Physical
Dimensions: 17.0” x 12.1” x 1.75” (432 x 308 x 44.5 mm)
Weight: 5.5 lbs (2.5 kg)
Power Requirements: 100-240 VAC, 50-60 Hz -or- +12 VDC, 1.5 Amps
Operating Temperature: 0 to 40°C ambient; 10 to 80% relative humidity, non-condensing
Ordering Information
Part # 4048: AudioConnect 8×8
Part # 4902: Rack mount kit for AudioConnect 8×8. Includes mounting bracket and screws
Complementary Products
For all Applications: SoundCheck audio test and measurement software
Depending on your application:
SCM Measurement microphone
Mouth simulator
Ear Simulator
Turntable
