Hertz (Hz) is a measurement of audio frequency. Human beings can typically hear sounds ranging from 20 to 20,000 Hz. The lower the frequency, the deeper the bass sound. A subwoofer box for home theatre reproduces low frequencies to deliver that deep, rumbling bass that adds realism to film soundtracks. The back control panel of the subwoofer is equipped with adjustment knobs to control various settings, including Hertz, so you can tune the box to suit your personal listening tastes.
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Shut off the subwoofer by pressing the power button on the front or back of the box.
Dial the crossover control knob on the back of the subwoofer so the marker on the knob aligns with the 40 Hz label on the dial surrounding the knob.
Press the power button to reactivate the sub, which is now tuned to reproduce all audio frequencies at 40 Hz and below.
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