stute.x1A Audio Analyzer
stute.x1A Audio Analyzer


  • Easy to use and touch friendly user interface
  • Analyze and optimize your loudspeaker box
  • Find the right speaker chassis for your audio project
  • Check audio crossover cut-over frequency & slope
  • Test the impedance EQ circuit
  • Verify the tuning of the bass reflex port
  • Test the frequency response of your audio amplifier
  • Check tone/equalizer settings
  • Display frequency spectrum and detect signal distortion (THD)

Key features

  • Accurate and high repeatability measurements
  • No time gate/window settings needed for acoustical meas.
  • Auto level adjustment for best performance 
  • SPL correct measurement
  • Efficient cursor functions to analyze your measurements
  • Frequency measurement range up to 47kHz
  • Comfortable scalable multi-channel xy screen with mathematics
  • ASIO and WDM driver support
  • Microphone correction   


Analyzer module

  • Measurement: Acoustical & Electrical frequency response, Impedance Z, FFT spectrum analysis incl. distortion k2..k7
  • Measurements up to 47kHz
  • Electrical measurement in mV, dB, dBV, dBm,..
  • Acoustical SPL correct measurement 
  • Auto-Level adjustment for acoustical measurements
  • FFT: 1024..32768 points, average 1..10, Window function
  • Microphone correction option
  • Shortcuts for default frequency ranges
  • Data memory for 2x6 measurements: Frequency response & impedance
  • Audio interface: ASIO and WDM driver support
  • ...

XY screen

  • Multi-channel screen (up to 6 channels parallel)
  • Cursor 1, 2, 2-1, x- y- axis cursor incl. readout
  • Smoothing function
  • Zoom
  • Mathematic functions
  • Saleable screen szie
  • 2 y-axis, lin/log x-axis
  • Text input per channel
  • Auto-scale functions
  • Diagram copy & paste
  • Copy diagram to clipboard
  • ….

FFT sine signal external audio generator

x1a xy fft 1k sin

RC filter freq. response up to 40kHz

x1A xy AE 45k RC

2 way vented loudspeaker box. Impedance measurement up to 40kHz. Vented port not adjusted optimal

x1A xy Z 45k 2wege

Self test frequency response "acoustical measurement". Frequency range up to 40kHz: Result close by the optimum flat linex1a xy AA selftest 40k


Our measurement set for a quick start

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

stutex1A bundle    



Schematic impedance Z measurement

Signal output => Audio interface headphone out.

Signal input <= Audio interface line inputs

x1a Z 350

Schematic acoustical measurement 

Signal output => Audio interface headphone out. Signal amplyfing about an external audio amplifier

Signal input <= Microphone and audio interface mic. input

x1a acoustic 350

Schematic crossover check

Signal output => Audio interface headphone out.

Signal input <= Audio interface line inputs

x1a crossover 350

FFT sine signal with distortion k2, k3,...

x1a xy fft 1k sinus verzerrt THD

FFT square signal external audio generator

x1a xy fft 1k rechteck

External signal: FFT with distortion coefficients k2 to k7 and fundamental frequency



System requirements

  • MS Windows 7, 8, 10 (32 & 64 bit), MS-Windows 10 recommeded
  • 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 (16bit). Recommendation Focusrite 2i2 or Behringer UMC202HD
  • Microphone for acoustical measurement, like Behringer ECM 8000.
  • Simple interface for electrical / Z measurement (see schematic stute.x1S in our download area...)
  • Processor i3 1.5GHz or above, RAM min. 2 GB
  • Screen resolution min. 1024x768 pixel