Audio Audit precisely test headphones, speakers
and can handle much more.
Audio Audit si professional tool with simple control.
All samples are made with professional equipment.
The application serves as a reference generator of sounds or records too.
What is Audio Audit for?
- Test quality of headphones, speakers and other audio device
- Check crossover frequency for the subwoofer setting
- Invaluable when choosing headphones or audio equipment in the shop - really plays everything as sales man says or writes the manufacturer?
- Sell audio equipment and want to show your customers? You can use Audio Audit.
- Do you have new speakers or audio equipment? Use Audio Audit for Burning-in
- Are you a DJ? Sound technician? Test your audio system and space whenever you need it.
Surely you will find other possibilities. If you´re missing some features, please contact us and we will add it to update.
How to use Audio Audit?
Tone – Generator of sinusoidal frequency
Find the frequency on which realy start play your headphones or speakers. In the ideal case should be heard all frequencies without sudden increase or decrease of volume - the best test is SEEK (Swept Sine). If you are using a subwoofer, you'll find the frequency at which you should have used speakers.
Noise Generator – generates different types of noise
Use Audio Audit as a reference tone generator to check frequency responses or the adverse influence of room.
- White noise - It can also be used for meditation,
- Pink noise - It can also be used for burning in drivers
- Brown noise - use to check subwoofer phase issues. It can also be used for burning in midrange and bass drivers.
- Filtered Noise - White noise, which is adapted to the anatomy of the human ear.
- Silent noise – „empty record“ – if you hear something else then just a quiet noise, something is wrong
Adjusting of the stereo base – useful tool for setting a stereo base
Make sure you have correctly connected or built speakers. The sound should gradually "wandering" in the right direction, or just play from the specified direction.
Indication of inverted phase
This is not for the headphones. Use Only for the speakers. Are the cables connected properly? If everything is okay, normal phase is pleasant to listen - sound is unpleseant when the phase is inverted. If you place the speakers in invert phase closer and facing each other, there is a significant volume decrease.
Records for testing – contains six test records without compression for assessment of audio quality
Six test tracks - try, how can your speakers or headphones play different types of music.
Real Time Analyzer
With this tool you are able to accurately analyze the quality of your audio system, find out which frequency your audio system emits in what strength. You are able to find the frequency weaknesses and then correct the setting of your equalizer.
RTA analyzes the signal from a microphone or line-in input.
Key features of the application
- determine the frequency range loudspeaker systems
- finding the frequency characteristics of the audio set
- control stereo base, left channel plays on the left and right channel on the right side
- finding the balance of the right and left channel (play left and right side equally loud?)
- detection of parasitic resonances and disturbing sounds
- detection of inverted phases
- burn-in speakers (The new speakers are recomended to burn-in. For this purpose you can use one of the available noise.)
- test the sound quality after adjustment
- all sounds are uncompressed ("it´s pure") audio files: PCM 44100Hz, 16bit, 2channel (stereo) - CD Quality
- sound level can be controlled only by hardware buttons on the device
Simply it´s reference application.
Additional informationes
Frequency generator
generates sinusoidal frequency or swap sinusoidal signal for testing
Noise generator
generates white, pink, brown, human and silence noise
- white noise - noise containing all frequencies in the range defined by the same volume
- pink noise - containing all the audio frequencies with a defined volume falls off at 3dB per octave
- brown noise - containing all the audio frequencies with a defined volume falls off at 6dB per octave
- human noise - containing all the audio frequency range with a defined volume adjusted according to physiological properties of the human ear
- silence noise - white noise with reduced volume
Adjusting of the stereo base
when right speaker is on the right side and left speaker is on the left side - it's OK
Indication of inverted phase
control of the inverted phase (swap of the plus and minus cable on one speaker)
Records for testing
music with the full spectrum frequency range for testing
Real Time Analyzer
- Resolution: 1/24 octave
- Logarithm frequency scale Linear frequency scale
- Peak hold Average curve of spectrum graph
- Touch cross hairs function
- Peak and RMS input meter
- Input gain control
Detail informationes
"Analogue" indicators:
- Peak indicator - red color (-75dB - 0dB)
- RMS indicator - black color (-75dB - 0dB)
Peak and RMS indicators for the left and the right channel
Frequency generator
- Sinusoidal signal of frequency (1/3 octave scale, Peak -12dB, RMS -15dB):
20Hz, 25 Hz, 31Hz, 40Hz, 50Hz, 63Hz, 80Hz, 100Hz, 125Hz, 160Hz, 200Hz, 250Hz, 315Hz, 400Hz, 500Hz, 630Hz, 800Hz, 1000Hz, 1250Hz, 1600Hz, 2000Hz, 2500Hz, 3150Hz, 4000Hz, 5000Hz, 6300Hz, 8000Hz, 10000Hz, 12500Hz, 16000Hz, 20000Hz
- Swap sinusoidal signal: 20Hz - 20000Hz (logarithmic course, Peak -12dB, RMS -15dB)
- Swap sinusoidal signal: 20Hz – 630 Hz (logarithmic course, Peak -12dB, RMS -15dB)
- Swap sinusoidal signal: 630Hz – 20000Hz (logarithmic course, Peak -12dB, RMS -15dB)
Noise generator
- White Noise: Peak -10dB, RMS -15dB, frequency range 20Hz – 20000Hz)
- Pink Noise: Peak -2dB, RMS -15dB, frequency range 20Hz – 20000Hz)
- Brown Noise: Peak -2dB, RMS -15dB, frequency range 20Hz – 20000Hz)
- Human Noise: Peak -2dB, RMS -15dB, frequency range 20Hz – 20000Hz)
- Silence Noise: Peak -55dB, RMS -96dB, frequency range 20Hz – 20000Hz)
Adjustment stereo base
- Bass Drums L: left side (Peak -2dB, RMS -15dB)
- Bass Drums R: right side (Peak -2dB, RMS -15dB)
- Bass Drums L-R-L: transition from left to right side and back (duration 30s, Peak -2dB, RMS -19dB)
- Treble Drums L: left side (Peak -1dB, RMS -16dB)
- Treble Drums R: right side (Peak -1dB, RMS -16dB)
- Treble Drums L-R-L: transition from left to right side and back (duration 30s, Peak -1dB, RMS -21dB)
Indication of inverted phase
- Guitar-normal: phase in order (Peak -0.3dB, RMS -14dB)
- Guitar-Invert: right channel inverted (Peak -0.3dB, RMS -14dB)
- Cool-normal: phase in order(Peak -0.3dB, RMS -13dB)
- Cool-invert: ritch channel inverted (Peak -0.3dB, RMS -13dB)
Test records
- Classic: duration 30s, Peak -0.3dB, RMS -15dB
- Cool: duration 36s, Peak -0.3dB, RMS -13dB
- Guitar: duration 36s, Peak -0.3dB, RMS -14dB
- Jazz: duration 36s, Peak -0.3dB, RMS -15dB
- News: duration 38s, Peak -0.3dB, RMS -15dB
- Road: duration 50s, Peak -0.3dB, RMS -16dB
Real Time Analyzer
Recording:
- iOS mode measurement usage (required iOS 5.0 and higher)
- Sample rate: 44100 Hz
- Bit depth (bit per sample): 16bit
- Channel: 1(mono)
Spectrum analysis:
- Frequency range: 20Hz – 20kHz
- Dynamic range: -100dB – 0dB
- FFT (Fast Fourier Transform) frame size: 4096
- FFT Overlap: 75%
- FFT Smoothing Window: Blackman-Harris
- Double precision calculation
