When building your own speakers, it is important to consider the crossover and frequency filters that you will use. The crossover is a circuit that divides the audio signal into separate frequency bands, which are then sent to the appropriate drivers (e.g. tweeters, midranges, woofers) in the speaker. This helps to ensure that each driver is only responsible for reproducing a specific range of frequencies, which it is designed to handle optimally.

There are several types of crossovers that you can use in a speaker, including low-pass, high-pass, and band-pass. A low-pass filter allows low-frequency signals to pass through while blocking high-frequency signals, and is typically used for the woofer in a speaker. A high-pass filter allows high-frequency signals to pass through while blocking low-frequency signals, and is typically used for the tweeter. A band-pass filter allows a specific range of frequencies to pass through while blocking frequencies outside of that range, and is used for the midrange driver in some speakers.

In addition to the type of crossover, it is also important to consider the crossover frequency, which is the point at which the signal is divided into different frequency bands. The crossover frequency should be chosen carefully, as it will have a significant impact on the overall sound of the speaker.