This means it needs two crossover filters called low-pass and high-pass. A low-pass filter (LPF) filters out high frequencies, only allowing low ones. A high-pass filter (HPF) does the opposite, ...

As we have detailed, the main filter types are high- (HPF) and low-pass (LPF). Set your cutoff frequency with either type at, say, 500Hz and the HPF will allow everything above 500Hz to pass; the LPF ...