AUDIO TOOLS

This is a collection of audio tools and test tone videos to optimize your room acoustics and professional audio or hifi system. These are tools to check your audio spectrum frequency response, check the polarity of your monitoring speakers, a 440 hz tone for concert pitch tuning and a chromatic frequency sweep to check for peaks and dips in your frequency curve.
From the casual listener to the audio engineer these audio tools can provide great results.

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Pink noise test tone

In this custom pink noise audio test generator all audio frequencies are represented at the same volume, the frequency curve is flat throughout the spectrum. This is ideal to test your speaker setup and room acoustics.
In regular pink noise there's a slight drop in volume towards the higher frequencies and after 10.000 hertz the drop is more substantial, so we induced a bit of white noise to flatten this curve. Due to the nature of pink noise and slightly pronounced low end this combined noise is less fatiguing on the ears so you can setup your system in a more comfortable way.

With a reference microphone and a frequency spectrum analyser you can detect peaks and dips in your room acoustics. These are caused by audio frequencies building up or cancelling each other out due to speaker positioning and room acoustics. Always measure from the listening position.

The onscreen frequency curve is your reference.
With a perfect speaker and room setup your spectrum analyser should display the same curve.
If your curve has substantial peaks and dips it means that at the spot where you measured there is a problem resulting in those peaks and dips.

Polarity check

With this audio tool you can test if your speakers or headphones are in phase.
The test tone starts 'in phase' then switches to 'out of phase'. The sound should be coming from the center of the stereo image when 'in phase' plays and out of center or like "in your head" when 'out of phase' plays.

When you experience it the other way around your speakers or headphones are out of phase.

440 Hertz

The most common modern tuning standard uses a 440 hertz tone for 'A' (above middle 'C') as a reference.

Audio spectrum sweep 10HZ - 12.000HZ

All tones of this stepped (chromatic) sine wave are equally loud, this audio tool is ideal to test your speaker setup and room acoustics by ear.
Peaks and dips can be detected when audio frequencies build up or cancel each other out due to speaker positioning and room acoustics.

(low end might be inaudible due to speakers)