$3.00
Pure sine wave at a frequency of 50 cycles per second for one hour is great for testing subwoofers or creating an ominous deep bass tone in your listening environment. Be careful, this can be hard on speakers or headphones if the volume is too loud.
Pure sine wave at a frequency of 50 cycles per second for ten hours. Be careful, this can be hard on speakers or headphones if the speakers are no robust or the volume is too loud. And the sound of this frequency may not be audible at all on laptop, tablet or phone speakers.
320kbps mp3 format
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