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How to Build a Passive Crossover for a Speaker

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    • 1). Use a crossover design program or a crossover design table to determine what values the inductors and capacitors will need to be to get the crossover points needed. The crossover points determine where the frequency spectrum is divided.

    • 2). Look at the subwoofer. Connect one side of the chosen inductor to the negative terminal of the subwoofer. Connect the positive terminal of the subwoofer to the positive speaker terminal of the amplifier. Connect the negative speaker terminal of the amplifier to the second terminal of the inductor. The inductor is in series with the subwoofer for this setup. This is a low pass filter.

    • 3). Look at the tweeter. Connect one side of the chosen capacitor to the negative terminal of the tweeter. Connect the positive terminal of the tweeter to the positive speaker terminal of the amplifier. Connect the negative speaker terminal of the amplifier to the second terminal of the capacitor. This is a high pass filter.

    • 4). Look at the mid-range speaker next. Connect one side of the chosen inductor to one side of the chosen capacitor. Connect the other side of the capacitor to the negative terminal of the mid-range. Connect the positive terminal of the mid-range to the positive speaker terminal of the amplifier. Connect the negative speaker terminal of the amplifier to the second terminal of the inductor. In this setup, the mid-range, capacitor and inductor are all in series. This creates a bandpass filter.

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