The capacitor is used to direct the high frequencies and resist the low frequencies.
The capacitor consists of layers of electrical conductive material but insolated from one another wounded around in a coil, where a voltage potential is encountered, this is called a dielectric layer. This storage of electrons causes a charge to be loaded sort of a very small fast battery.
Therefore, the capacitor conducts lower frequencies through the larger it is, so the capacitor must not be too big to protect a tweeter.
If only one capacitor is used in series, it is called a first-order high pass filter or 6dB per octave high pass filter. If you want to filtrate more efficiently, you may want to insert a coil after the capacitor and connect it to minus / ground. This will cause the coil to short circuit lower frequencies to minus. This type of filter is known as second order filter or 12dB per octave filter.
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