The passive crossover for audio speakers is an adjustable control for directing sound frequencies to different speakers connected to a stereo system. For example, sound frequencies below 60 Hertz (Hz) are considered low-frequency bass, and are typically produced by a woofer or subwoofer. When the subwoofer is connected to two or more speakers, matching the crossover control to the speakers helps your system operate more efficiently for better sound quality.
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Identify the frequency response range for all audio speakers connected to your system. The frequency range is typically printed on the rear of each speaker, and can also be found in the instruction manual, typically in the back pages of the manual under the specifications listings.
Dial the crossover control knob on the system (or the back of a subwoofer) to match the setting with the lowest frequency response on the pair of speakers. For example, if a pair of stereo speakers reproduce 50 Hz sound frequencies on the lower end of the audio scale, dial the crossover setting slightly higher than 50 Hz.
Turn on the power to the stereo, and play back an audio source such as a CD or radio. The crossover setting you select will instruct the stereo system to send audio signals below the crossover setting to your bass speakers or subwoofers. Frequencies higher than the crossover setting will be directed to the pair or pairs of main audio speakers.
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