Also you can locate problematic structures in your room, such as resonating curtain rails or furniture rattling at certain frequencies. Use this signal to check at what frequency the sound in your audio system becomes audible, how precisely the sound level remains constant over frequency and to locate any clear dips (anti-resonances) and peaks (resonances) in level at your listening location. The level of the signal remains constant. The second test tone sweep1.mp3 contains a tone that changes linearly in frequency from 10Hz to 150Hz. Start from a low sound level and work up towards higher levels. This signal is particularly useful for testing the output capacity of your system because the signal is not continuous, stressing your audio system similar to actual music and yet the signal is analytical and well defined. The source may be your loudspeakers but also something resonating in your listening room or even the audio equipment feeding the loudspeakers. If you hear any distortion, noises or rattling check your sound system and your room.
The tone should be clean and all tones should have the same level.
As you play this signal pay attention to the purity of the tone. There is a little space between the tones to enable your audio system to build up its forces. First of the test signals boink.mp3 is a collection of tones at individual frequencies.