Tag Archive for: audio interface

AudioConnect 2 Audio Measurement Interface Demonstration

What makes an audio measurement interface different from any other audio interface? This is a good question. As you probably know, SoundCheck works with most audio interfaces – this is advantageous as our customers can use hardware they already own, keeping the overall system cost down.

However, if you don’t have an audio interface and need to get one at the same time as your test system, there are many advantages to purchasing dedicated test hardware such as the AudioConnect 2, or for multi-channel applications, the AmpConnect 621. They include many features specifically designed for audio test, such as microphone power and internal switching. This saves money on other components. They are designed for production and field measurements so they are ruggedly constructed, and unnecessary features such as front panel controls are eliminated to avoid accidental adjustment. Perhaps more importantly, Listen’s audio interfaces are configured for full plug’n’play automated setup that hugely simplifies the setup process and virtually eliminates the possibility of incorrect configuration.

Watch this short 5 minute video to learn more.

 AudioConnect 2 Audio Measurement Interface Demonstration Video

Learn more about the AudioConnect 2 Interface

Check out our product information page, and another short video that we made explaining the philosophy around offering our latest generation audio interfaces.

More Information?

Curious? Contact our sales team for more information and pricing.

Listen Introduces AudioConnect 2, a New Portable Dual-Channel Audio Interface

AudioConnect 2, Listen’s new compact and high resolution two-channel audio interface is designed for measurements anywhere from the production line to out in the field, and is particularly suitable for headphone testing. It features 2 input channels with a sampling rate up to 192 kHz, microphone power, TEDS support, a low-noise headphone amplifier, and two line outputs. It can be powered via a laptop’s USB-C for portability and for field measurements.

With up to 90kHz frequency range, its two input channels can be independently configured as TEDS-compatible microphone and accelerometer inputs with constant current bias, microphone inputs with constant voltage bias, or regular line-in. This makes it compatible with a wide range of transducers including both SCM and IEPE microphones, couplers, accelerometers and most modern head and torso simulators, including the high resolution Brüel and Kjær 5128. The inputs feature selectable 0/20dB input gain with level and overload indicators.

Two line outputs drive microspeakers and powered loudspeakers or mouth simulators, or control SC Amp (Listen’s audio amplifier) or other similar devices. A separate low noise, low distortion, headphone amplifier powers headphones or allows monitoring of the audio signal via wired headphones.

Designed for portability, AudioConnect 2 is just 4.375” wide x 1.8” high x 8.625” deep, and is powered from a laptop via USB-C, eliminating the need for a dedicated power supply. This makes it ideal for measurements outside the lab such as testing headphones and hearing aids in real-world environments and making in-car audio measurements. For additional functionality, the line powered BQC Bluetooth interface can be added to configure a fully portable Bluetooth headphone test system with both hardware devices running from your laptop’s USB power! A power supply is also included, making it equally suited to production environments where its rack-mount compatibility, ruggedness and competitive price point also ensure that it offers excellent value.

Like Listen’s other new interfaces, AudioConnect 2 is designed for seamless use with SoundCheck. Setup time is minimal as SoundCheck automatically configures the device, loads the factory-saved calibration values and automatically populates the input channels with sampling rate. Self-test requires no additional cabling as all switching is internal. There are no front panel controls; control is exclusively via the software – either through a sequence or a dedicated control panel. This eliminates any possibility of accidental change to the settings. Level and overload indicators ensure reliable results with a clear warning if the signal is near or actually clipping, and BNC connectors minimize the possibility of  a cable becoming disconnected.

More information

100 Things #2: SoundCheck Works With Any Audio Interface

Since its inception in 1995, SoundCheck was designed to use any audio interface from a professional sound card to a high precision National Instruments data acquisition card. In this short video, we explain how this flexibility permits high channel count, portability, high accuracy or low cost. This is particularly useful where you have differing needs within your organization, yet would like to all use the same measurement system. It also makes it easy to transition measurement configurations from one audio interface to another, as often happens when moving an R&D test into production.

SoundCheck Works With Any Audio Interface

Learn More About hardware to use with SoundCheck

Check out our Hardware Compatibility List to see our suggested tried and tested audio interfaces.

Check out our own audio interfaces, the AmpConnect 621 6-in, 2-out interface, and AudioConnect 2, a budget 2-in, 2-out interface. our newest multichannel audio interface.


Video Script: SoundCheck Works With Any Audio Interface

Since we first launched SoundCheck in 1995, it has been designed to use any audio interface from a professional sound card to a high precision National Instruments data acquisition card.

This philosophy offers immense configuration flexibility, whether your needs are high channel count, portability, high accuracy or low cost. The SoundCheck software itself allows additional channels to be purchased, so it’s easy to match (and even change) your number of software channels with your interface needs.

This is particularly useful where you have differing needs within your organization, yet would like to all use the same measurement system. It also makes it easy to transition measurement configurations from one audio interface to another, as often happens when moving an R&D test into production.

While you can use any audio interface, we provide a list of tried, tested, and supported products with up to 64 channels. These all meet strict performance and latency criteria, and, when purchased through Listen, are supplied fully calibrated and ready to connect to your system.

Although this flexibility has always been integral to our product philosophy, since 2009, we’ve also offered our own audio interfaces. We’ve designed these specifically for measurement applications, adding functionality such as microphone power, amplifiers, impedance measurement, digital I/O, and signal routing, as well as high resolution options,  in a single unit with just a USB connection to the computer.

We’ve also eliminated most on-unit controls for simple error-free operation. The tight integration that our own products offer with SoundCheck enables automatic configuration for rapid set-up, and additional features such as automatic gain control, TEDS transducer calibration compatibility and more.

And naturally, our audio interfaces, as well as any recommended 3rd party products have always offered silent operation so as not to interfere with acoustic measurements.

We’re always happy to advise on the best audio interface to use with SoundCheck for your application, whether that’s one of our own products or something else.


AmpConnect 621 Demo Video

In this short video, sales engineer Les Quindipan gives a brief overview and demonstration of the new AmpConnect 621 multichannel, high-resolution audio interface.

New AmpConnect 621 Multichannel, Multifunction Audio Interface

AmpConnect 621

The new AmpConnect 621 is Listen’s next generation multichannel, multifunction, high resolution audio test interface. It is ideal for any application where more than 2 channels are needed, for example, automotive audio, voice-activated device measurements, sound power measurements and measuring devices with multiple speakers such as soundbars and smartphones. With a sample rate of up to 192kHz, it is also a great choice for measuring high resolution devices such as headphones and hearables. Additionally, it includes all the functionality required for audio testing in just one unit, including an amplifier, microphone power supply, line outputs and digital I/O.

AmpConnect 621 features 6 inputs, 2 line outputs and one amplifier output. All inputs offer microphone power (SCM, IEPE and pre-polarized), to accommodate many types of couplers, accelerometers and reference microphones – even the new Brüel and Kjær 5128 high resolution head and torso simulator. Full TEDS support for microphones and accelerometers simplifies setup and calibration by importing the data at the click of a button. The 2 line level outputs plus  a separate 50W amplifier route the output signal to any sources, powered or needing amplification, (e.g. artificial mouth, speakers, headphones, automotive head units). Impedance measurements using the amplifier output, along with output voltage monitoring, are performed entirely internally and do not require using any of the 6 external input channels, leaving them open for other measurements. This, along with digital I/O, simplifies operation as signals are all routed internally with no additional cabling required. The device connects to the computer with a single USB cable; the only additional cables required are those connecting your microphones and DUTs. This all-in-one approach offers excellent ground loop immunity in comparison to discrete components.

The interface has no control knobs on the front; control is entirely through the SoundCheck software interface. This minimizes errors by making it impossible for settings to be accidentally changed. For example, in a production environment, the only way the operator can adjust the settings is by modifying the test sequence, and access to this can be restricted via operator access rights. This helps OEMs ensure test integrity when requiring contract manufacturers or offshore manufacturing facilities to run their test sequences. This is also advantageous for protecting against accidental changes in a laboratory, particularly when multiple people are accessing the same piece of equipment. The front panel features visual indicators for power, input and output level, amplifier channel and level so that overloads, etc. can be clearly identified.

Test deployment is fast with full plug and play functionality. Channel configuration is fully automatic when the AmpConnect 621 is connected to the SoundCheck computer – the user just needs to adjust driver selection and sampling rate if different from the default values. Calibration data is read from TEDS microphones in SoundCheck’s calibration editor, or easily imported from a calibration file. When setting up multiple systems, the AmpConnect only needs to be configured once, and the setup can be duplicated to other test stations; there is no need to re-configure AmpConnect 621 each time.

AmpConnect 621 offers the option to use WASAPI-exclusive mode with Windows 10 audio devices in addition to the more commonly used ASIO drivers. This advanced communication protocol allows SoundCheck to bypass the Windows audio mixer, sending audio streams directly to the device. This results in lower latency and ensures that there is no sample rate conversion behind the scenes. It also enables SoundCheck to put an exclusive lock on the audio interface so that a measurement cannot be disrupted by system sounds which is valuable in highly automated settings. Multiple WASAPI devices can be used simultaneously, and WASAPI and ASIO devices can be combined to increase channel availability.

Like Listen’s other hardware products, AmpConnect 621 is built to last in production environments. The 17” wide x 2-Units (3.5”) high x 11.5” deep rack-mountable unit is rugged with a new fingerprint-resistant matte finish.


View Product Page