Crossover-3

A three-band Linkwitz–Riley crossover with separate low/mid and mid/high transition frequencies.

What it does #

Crossover-3 separates one full-band signal into Low, Mid, and High outputs. The lower Frequency sets where Low gives way to Mid, and the upper Frequency sets where Mid gives way to High.

Controls and ports #

Control	Label	Official description
low_freq	Low Freq	Transition frequency between the low and middle bands
high_freq	High Freq	Transition frequency between the middle and high bands

Practical uses #

• Create a three-band distortion or dynamics processor with different settings for bass, body, and treble.
• Leave Low untouched, widen Mid modestly, and apply stronger ambience only to High.
• Route each band into different sequenced or feedback effects and recombine them with Mixer.

Things to know #

• The filters overlap around both transition frequencies; the Mid output is the region between two matched crossover boundaries.
• Low Frequency should remain below High Frequency for the conventional three-band interpretation.
• The exact recovered core uses a three-band Linkwitz–Riley processor in the 4x Grid domain.
• Recombination behavior when transition frequencies cross or coincide remains a live-test item.

Technical details #

A high-confidence Nitro implementation candidate supports the technical summary, but the visible-module mapping remains inferred.

The exact filter/LR3 body exposes in, freqLow, freqHigh, and three band outputs. It owns a LinkwitzRiley3_2Pole processor, converts both frequencies to internal half-W coefficients, and emits band 1, band 2, and band 3 for every one of four Grid sub-samples. State resets on start. The imported filter class hides the precise coefficient and band-combination equations.

Nitro port	Type
in	InputAudioPortType
freqLow	InputAudioPortType
freqHigh	InputAudioPortType
outLow	OutputAudioPortType
outMid	OutputAudioPortType
outHigh	OutputAudioPortType

Open questions #

• Measure summed reconstruction, polarity, latency, crossing level, and slope at both transitions.
• Test coincident and crossed frequency settings, extreme limits, modulation smoothing, and audio-rate modulation.
• Verify stereo independence, initialization, and reset transients.

Version and sources #

Checked against Bitwig Studio 6.0.6. This page combines Bitwig's module metadata, the existing Grid course and guides, and Nitro analysis where the mapping is strong enough to support a technical statement.

Related material #

• Grid Modules course reference

Return to Bitwig Grid Modules or the Grid Modules course lesson.