Simple Explanation

A type of audio crossover filter that keeps the signal timing (phase) very smooth across all frequencies.

Concise Technical Definition

A filter that provides a linear phase response and constant group delay, ensuring minimal signal distortion but with a slower roll-off compared to other filters.

Layman-Friendly Analogy

Like a calm, smooth driver who gradually slows down before a stoplight—no sudden braking or jolts, making the ride feel seamless.

Industry Usage Summary

Bessel crossovers are used in audio systems where preserving the time-domain characteristics of a signal is important—ideal for high-fidelity speaker designs, especially midrange and tweeter crossovers.

Engineering Shortcut

Bessel = smooth timing, gentle slope, ideal for preserving waveform shape.

Full Technical Explanation

A Bessel crossover employs a filter with a linear phase response and constant group delay, meaning all frequencies are delayed equally. This ensures the waveform shape (like a step response) is preserved without overshoot or ringing. While the amplitude response rolls off more slowly than filters like Butterworth or Linkwitz-Riley, the phase linearity makes it excellent for applications where phase integrity and time alignment matter most, such as in high-quality speaker designs and studio monitors.