| You may have noticed a button on your receiver or remote control marked "Test Tone". This is a useful feature when setting up and calibrating you speakers.
Though it's less of a tone than a hissing sound on most receivers, the test tone allows you to properly set up your speaker levels. Since every room is different, you need to adjust the sound output of the various speakers so they produce sound at the proper levels for your environment.
The test tone produces a sound in each speaker, one by one. It repeats indefinitely until you have just the right level set for each speaker. When used in conjunction with a sound meter, you can achieve very accurate results.
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