2nd order linkwitz-riley crossover

1. What is an LR2 crossover?
2. What is the difference between Linkwitz-Riley and Butterworth?
3. What is 4th order crossover?

What is an LR2 crossover?

Second-order Linkwitz–Riley crossover (LR2, LR-2)

There is a 180° phase difference between the low-pass and high-pass output of the filter, which can be corrected by inverting one signal. In loudspeakers this is usually done by reversing the polarity of one driver if the crossover is passive.

What is the difference between Linkwitz-Riley and Butterworth?

A Linkwitz-Riley filter is made by combining two Butterworth filters. The main difference between the two is that Butterworth crossovers are 3dB down at the filter cutoff frequency while the Linkwitz-Riley filters are flat.

What is 4th order crossover?

An electric 4th order crossover is four components per driver and is designed to achieve a 24dB/Octave cutoff. Since most speaker drivers are designed (or incidentally limited) to have a cutoff at the end of their desirable operational bandwidth, a proper crossover design incorporates that cutoff.