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Your subwoofer crossover frequency of 80Hz in the receiver is Low-Pass frequency. It means that all sound frequencies above 80Hz are blocked from your subwoofer. The 120Hz frequency for your other speakers are High-Pass frequency. It means that all frequencies below 120 Hz are blocked from those speakers and sent to the subwoofer. However, the crossover setting of 80Hz will block frequencies between 80hz and 120Hz from the subwoofer. This is called an audio hole. Do you see the problem?
It is true that crossover networks are not perfect and have a slope, meaning they gradually block the frequencies above or below the cutoff point. Can you actually hear the frequency hole in the 80Hz to 120Hz range? I will leave the answer up to you. |
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