iFrequency is an easy-to-use tone generator, and lets you play a sound at any frequency from 16Hz to 10, 000Hz. This is useful for instrument tuning, testing speakers (including subwoofers) and even just for fun. You can specify a frequency in 1Hz increments, and there is a separate slider for low frequency and high frequency sounds.
iFrequency is particularly useful as a bass test signal generator in car stereo tuning, or just to show off to your mates.
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