A bandpass filter refers to an electronic circuit or signal processing technique used to limit the frequency range of an audio signal that is sent to a specific driver or set of drivers within a loudspeaker system. It is employed to ensure that each driver operates within its intended frequency range and to achieve a desired frequency response for the overall system. For the DIYer, a bandpass crossover filter would typically be seen in a 3-way loudspeaker design on the midrange driver. While higher order systems such as 4- or 5-way loudspeakers would also employ bandpass filters, they are rarely seen in the DIY world. A bandpass filter consists of two main components:
- Low-Pass Filter: This filter attenuates frequencies above a certain cutoff frequency, allowing only low-frequency signals to pass through. It is typically used to direct bass or low-frequency signals to a dedicated driver. For more information see Low-Pass Filter.
- High-Pass Filter: This filter attenuates frequencies below a certain cutoff frequency, allowing only high-frequency signals to pass through. It is commonly used to direct mid-range and high-frequency signals to the appropriate drivers. For more information see High-Pass Filter.
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