multibandkompressor

A multibandkompressor, often called a multiband compressor, is an audio dynamics processor that splits an incoming signal into several frequency bands and applies independent compression to each band. This allows targeted control of dynamics across the spectrum, enabling adjustments to bass, midrange, and treble without affecting other ranges.

Operation: A crossover network (analog or digital) divides the signal into bands, commonly low, mid, and high. Each band has its own compressor with parameters such as threshold, ratio, attack, release, and knee, plus makeup gain. The compressed bands are summed to form the final output. Some designs include sidechain options, expansion, or midpoint spectral shaping.

Implementation: Multiband compression exists as hardware units and as software plugins. Techniques vary: fixed- or parametric-crossovers, linear-phase or minimum-phase processing, and different detector types. Because bands are processed separately, issues such as phase shift and inter-band pumping can occur; modern implementations mitigate these with advanced crossover filters and careful tuning.

Applications: In mixing and mastering, multiband compression controls overall loudness and tonal balance, reduces bass dynamics in the low end, and tames sibilance or harshness in the presence. It is often used on bus groups (drums, vocals, mix bus) or on masters to achieve cohesive loudness without over-compressing the entire signal.

Considerations: Use moderate ratios and gradual attack to avoid audible artifacts. Visual and auditory checks help ensure natural results. While powerful, multiband compression can alter phase relationships and tonal balance if misused, so they should be integrated with other dynamics processing and reference material.