Linkwitz-Riley Crossover
Simple Explanation
A type of audio filter that smoothly splits sound between speakers like woofers and tweeters, so nothing overlaps or cancels out.
Concise Technical Definition
A crossover filter design using two cascaded 2nd-order Butterworth filters to achieve a 4th-order (24 dB/octave) slope with flat summed frequency response and in-phase outputs at the crossover point.
Layman-Friendly Analogy
Like handing off a baton in a relay race so smoothly that there’s no gap or clash between runners.
Industry Usage Summary
Widely used in active speaker systems and DSP-based crossovers for its steep 24 dB/octave rolloff and phase-coherent summing; replaces older 3rd-order Butterworth designs in most professional applications.
Full Technical Explanation
The Linkwitz-Riley crossover, commonly abbreviated as LR-4, is a filter topology used to divide audio signals between drivers (e.g., woofers and tweeters) in multiway loudspeaker systems. It is formed by cascading two 2nd-order Butterworth filters (low-pass and high-pass), resulting in a 4th-order filter with a 24 dB/octave slope. The advantage of the LR-4 design is that the outputs are in phase at the crossover frequency and sum to a flat frequency response, minimizing both amplitude and phase anomalies at the crossover point. This makes it the standard choice in active crossover networks for professional and high-fidelity audio systems. It improves upon earlier Butterworth filters by reducing lobing and phase issues in the transition region between drivers.
Related Terms
Active, Active Crossover, Active Speaker, Amplitude, Audio, Crossover Frequency, dB/octave, Filter, Filter, Flat, Frequency, Frequency Response