stute.x1A Audio Analyzer

Precise electrical & acoustical measurements

Application samples

Optimize the sound of your loudspeaker box
Find the best speaker driver for your project
Check the audio Filter behavior
Test your impedance EQ-circuit (RC/RLC)
Verify the bass reflex port
Test your audio amplifier and TONE/EQUALIZER CONTROL 
Check the thiele small parameter (Vas, qts,...) of your Speaker driver
Analyze and calculate the signal distortion  (k2..k7)

How It Works

Step 1

Hardware: Connect your USB audio interface to your PC. Prepare the small measuring adapter stute.x1S (free schematic from download).

Step 2

Software: Install and configure initial the stute.x1A Audio Analyzer software.

Step 3

Ready, start with your measurements.

Key features

Frequency range
Wide measurement Frequency range up to 47kHz
easy Usage of a standard USB audio interface (ASIO or WDM driver) 
high repeat accuracy for electrical & acoustical measurement
User interface
User & touch-screen friendly Design. No overloaded screens.
Multi-channel measurement and powerful xy screen 
Microphone correction possible
Audio signal source
Audio signal generator included
SPL measurement
SPL correct acoustical measurement supported

Analyzer screen

XY screen

measurement Example

Amplifier tone control

Check the frequency response of the amplifier or the tone control settings for channel L and R within one measurement.

measurement Example

Acoustical frequency response 

Measure the frequency response of a single driver or from the complete loudspeaker box.

measurement Example

Audio crossover check

Verify the cutoff frequencies or the audio filter slope or display the driver impedance influence to the filter characteristic.

measurement Example

Driver impedance Z

Measure the impedance diagram of the driver to get the best input for the audio filter calculation. Also verify via this measurement type your impedance EQ circuit (RC / RLC) or the bass reflex tuning or...

measurement Example

Thiele Small Parameter

The driver parameter are essential for the driver enclosure calculation and important for the frequency response or step response. But often are the T-S data different to the values from vendor datasheets. This leads into a bad sound. Verify the parameter before you calculate the enclosure. Also possible: Control your driver burn in process via the parameter change.

measurement Example


Execute a FFT to display the spectrum of an electrical or acoustical signal. Measure signal distortions k2..k7.


System requirements

PC with MS-Windows 7, 8, 10 (32 & 64 bit). Processor i3 1.5GHz or above, screen resolution min. 1024x768 pixel. Internet connection to activate the license.

USB Audio interface with headphone output, stereo line input and microphone input.  Level of inputs and outputs adjustable. Supported driver ASIO and Windows WDM.  Sample rate 44.1kHz, 48kHz, 96kHz. Recommendation: Behringer UMC202HD. 

Microphone for acoustical measurement, like Behringer ECM 8000.

Simple interface for electrical / Z measurement (stute.x1S schematic see download page).

stute.x1A bundle

For your quick start!

The stute.x1A BUNDLE  includes the software stute.x1A, a high resolution USB audio interface, a measurement microphone with XLR cable and the stute.x1S PCBA adapter. 

stute.x1S INterface

Simple measurement interface

You need for the complete system adjustment and some electrical measurements the simple interface stute.x1S. For the construction by your own you get the schematic for free at the download page. 

For a faster implementation you get in our web shop the PCB, PCBA (PCB incl.components) or KIT (PCBA + case + front panels). The PCBA and KIT are delivered as an assembly.