Audio Analyzer ATB 805

Audio Analyzer ATB 805

Professional measurement can not be easier. The price is very favourable.


The ATB 805 USB unit is an easy to use 2-channel Audio Analyzer. The functions are power amplifier, microphone amplifier and high precise 24bit, 94kHz Converter. The measurements are easy to set with the measurement switch.

Due to the 2-channel it is also for measurement programs besides ours.

Measurement switch Speaker power switch, SPL calibrated

Speaker out with 32W at 8Ω, 60W at 4Ω; 2 x microphone in; Digital out with coaxial and optical; 2 x LINE in and 2 x LINE out


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

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 optimize, 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

The Windows measuring program corresponds to a small ATB precision program offering all the functions of the Windows operating system.

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 measurement switch is set to Calibration

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. It can also copy to the clipboard as text file and can delete a plot.

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


The measurement switch is set to SPL


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.



The measurement switch is set to Impedance

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 measurement switch is set to Magnitude

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 THD measurement works with a sine wave. The frequency range is from 20Hz – 7kHz. The calculation is up to K8. The value is displayed in %. The frequency spectrum is shown in the plot to see the characteristic of the distortion.

With the modern on board soundcard the resolution is 0,002%.


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.

Technical data for ATB 805

Microphone input, 2-channel
Frequency range:   20Hz – 22kHz + 0,1dB, microphone power 9VDC
Special addition ATB 805 XLR: XLR microphone in, power 48VDC
Input range:   50mV – 0,7V, noise < -50dB, THD  < 0,05%

LINE out and in, 2-channel

Speaker out
Frequency range:   10Hz – 22kHz + 0,2dB
Power:  60W at 4Ω, 30W at 8Ω, THD 0,05%

Digital out coaxial and optical

Dimension: (W x H x D) 430 x 40 x 150 mm

Power: 230V+ / 50Hz / 60VA

Connection: USB 2

Program: Windows Vista, 7, 8, 10   32bit and 64bit

Read more in the Handbook



Kirchner Elektronik,

Your Partner for Audio Measurement!