The ATB PC Pro Measuring system is a professional Audio Analyser.

The Windows XP or Vista program is combined with the computer’s soundcard, the measurement microphone and the Test-Box forms an exact and extensive measurement system.

The applications for the ATB PC Pro are the speaker development, room acoustic optimise, the installation of car sound systems, the setting of Surround reproduction systems and the noise analyser. For testing the home cinema system there is the Surround-Test DVD for the signals. For setting a car sound system there is the Auto-Test CD for the signals.

The following measurements are available:

Electric and acoustic amplitude frequency response, SPL, RTA, Magnitude

Electric and acoustic phase frequency response

Impedance measurement

Step response

Distortion THD

Distortion IMD

RMS (sound) level meter

Thiele-Small parameter

For easy setting the automotive sound system there is the Auto-Test CD. For getting the measurement signal, stimulus, it is to play it in the automotive CD player.

Notebooks and external USB soundcards prove to be ideal for this field of work.

For the high precision of the measurement there is a calibration of the soundcard.

For CAD or calculation program or data base the ATB PC data can be exported in many formats. The export is to MLSSA, LAUD, IMP and CLIO file.




The Test-Box is connected from the headphone output to the microphone input of the soundcard.

With the system-correction function measured a file for the correction of the soundcard. This will be used automatically for the following measurements.

With the Mic-correction the calibration file for the ATB microphone will be loaded. There is also a function to set microphone calibration for other microphones.


Electric and acoustic amplitude frequency response, SPL

Electric and acoustic phase frequency response

Impedance measurement

Step response

Distortion THD

Distortion IMD

RMS (sound) level meter

Thiele-Small parameter


Single measure, single measure+ up to 32 curves

Continued measure RTA, continued measure+ for the setting of devise

Continued measure with averaging, continued measure with averaging+ for anechoic measurement in room or automotive and for the power distribution of a speaker



The parameter menu is for scaling, smoothing and dB setting

The plotmenu is for setting colour and name of the plots. The can also copy to the clipboard as text file. There is also the function delete plots.

The combine menu is for combine the nearfield measurement for the bass with the SPL for the mid and high.


Setting for the SPL measurement

For the SPL (Sound Pressure Level) measurement there is the included measurement microphoneMC2. The microphone is connected to the MIC input of the soundcard. The frequency response is very flat in the range from 20Hz – 20kHz. Therefore, there is no need of a correction. The plot shows the response of the microphone with calibration file.

The RMS level meter is for the calibration of the microphone.

It is for reading out the sound pressure level, SPL.



For the impedance measurement there is the Test-Box. The box is connected between the headphone and the MIC input of the soundcard. The Impedance plot is shown in the SPL graph and the scaling is at the right side.




The Magnitude is an electrical measurement for testing preamplifier, DSP and other units with line level. The headphone out of the soundcard is connected to the input of unit under test via the test-box. The output of the unit is connected to the MIC input of the soundcard. The test-box is switched to CORRECTION and 2.


The phase measurement is due to the automatically 0-phase calculation function. For the measurement there is no setting of a distance or time window. The phase measurement is not influenced by the user so there is always the right phase plot. The acoustical phase measurement is comparable.



The step measurement is similar to the step response measurement. It shows the time behaviour of the sound pressure of a speaker. For subwoofer sound systems there is to measure the impulse of the Subwoofer and the satellites. Therefore, the phase control of the subwoofer could be set in the way, that both speakers have the same impulse.

The three Steps show the different delays between tweeter and mid of a two speaker system



The ATB PC program is a very comfortable spectrum analyzer. It is for analysing all kinds of sound. The program is used in the automotive industries to reduce the noise of the car. The picture shows the spectrum of the signal 13.The red curve is without and the blue curve with distortion.

Distortion THD

The distortion measurement shows the THD and the harmonics H2, H3, H4, H5.
After the measurement it can be decided between the THD and H2, H3, H4, H5 plot.
The sound pressure for the measurement is set in the SPL menu.

Scale: 1%, 10%, 100%
Frequency range: 20Hz – 8kHz
Precision: > 0.01%


Distortion IMD

For the IMD measurement there is the signal 13. The signal is shown in the Analyzer capital. The intermodulation distortion measurement is for the test of a non-linear transfer function of a unit. This is described by Wolfgang Klippel.

The measurement is for testing the sound quality and the maximal undisturbed Power. To see the quality the Q-index is displayed. The distortion can be heard if the value for the Q-index is smaller than 1100.

The program displays the Q-index and the spectrum.

Thiele-Small Parameter

The Thiel-Small parameter measurement is copied from the ATB precision Audio analyser used all over the world. The measurement is very precise. It gives you error messages when there is something wrong with the measurement. The program uses the weight method.

Dolby Digital Test DVD

The Dolby Digital Test DVD is for testing the home cinema equipment. With the DVD it is easy to set the Surround decoder. It is also easy to set the subwoofer, the main problem in surround systems.

Single-signals 3. FL, 4. C, 5. FR, 6. RS, 7. LS, 8. SW
Sum-signals 9. FL+FR, 10. FR+C+FL, 11. LS+RS,
Sum &Bass 13. FR+SW, 14. C+SW, 15. FR+SW,
16. FR+FL+SW, 17. LS+RS+SW,
18. FR+C+FL+SW,
PCM 20. R, 21. L, 22. R+L, 23. R-L
BONUS Track1 24. Signal going round

Track2 25. Signal going diagonal


ATB PC Pro system includes:

Measurement program for Windows  XP, 7 and 8, Measurement microphone MC1 Frequency range 20Hz – 20kHz, Test-Box for impedance measurement and calibration, Surround-Test DVD Handbook as PDF USB dongle.

For the easy measurement in the car there is the Auto-Test CD additional to by.

Measurement microphone MC2

Frequency range

20Hz – 20kHz

Test-Box for impedance measurement and calibration

Surround-Test DVD

Auto- Test CD

Handbook as PDF

USB dongle


MC 2 Measurement microphone for soundcard

Technical data

Capsule Condensor (Back-Elektret)

Omnidirectional charakteristic

Frequency range 20Hz – 20kHz

Sensitivity 6mV/Pa/1kHz + 4dB

Power 1.5V – 10V = 0,5mA

More information in the handbook

Kirchner Elektronik,

Your Partner for Audio Measurement!