990Hz Sine Wave Test Tone - 600 Seconds (10 Minutes)

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600 seconds (10 minutes) test tone of 990Hz sine wave. Used to test your audio equipment and environment at a specific audio frequency.

990Hz sits in the midrange part of the audio frequency spectrum.

If you can’t hear anything, there may be an issue with the equipment you’re using to listen to this audio. Not all speakers and/or headphones can reproduce the full frequency spectrum. Please take this into consideration.

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