The Physics

When correlated signal is played trough the same speaker with different time of arrival, interference occurs. The signals sum at some frequencies and cancel at others, creating a repeating pattern of peaks and notches across the spectrum.

The first notch appears at the frequency where the delay difference equals half a wavelength — the signals arrive in opposite phase and cancel. At the frequency where the delay equals a full wavelength, the signals reinforce. 

The pattern repeats at every multiple of these frequencies, creating the characteristic "comb" shape that gives the effect its name.

The severity of the notches depends on correlation and level matching. Two speakers at equal level with identical signals create complete cancellation at notch frequencies. As levels differ or correlation decreases, the notches become shallower. 

Real spatial audio systems typically create partial notches that hollow out the sound without completely eliminating frequencies — often worse subjectively than complete cancellation because the result sounds "wrong" rather than simply "missing." 

Why Traditional Approaches Fail

The obvious solution — EQ — doesn't work because the comb pattern depends on each sources/speaker correlation. Move your source and the delay relationships change, moving all the notches to different frequencies. An EQ that corrects one source position right but everyone else wrong.

Manual delay alignment doesn't solve it either. The delays that create comb filtering are the same delays that create the spatial impression. Removing the delays would collapse the spatial image.

The ICS solution

ICS succeeds where other approaches fail because it addresses the problem dynamically, at its source. By tracking correlation and delay relationships continuously, ICS applies precisely-targeted correction that adapts to current conditions. 

The correction doesn't depend on listener position because it happens in the digital domain, modifying the signals before they create acoustic interference.

The key insight is that while the acoustic comb filtering varies with source position, the correlation between speaker feeds doesn't.

Multi-Speaker Installations

Art installations, museum exhibits, and immersive experiences increasingly rely on large speaker arrays to create enveloping soundscapes. 

Dozens of speakers surround visitors, sources move through space, environments transform moment to moment. The creative potential is enormous — but so is the comb filtering potential.

ICS enables these installations to realize their creative vision without timbral compromise. Every source, regardless of position, sounds natural. 

Moving sources maintain consistent timbre throughout their trajectory. Complex scenes with many simultaneous sources don't degrade into hollow, phasey washes.

Content can include the full frequency spectrum rather than avoiding problematic ranges. Movement patterns can be complex rather than limited to comb-safe trajectories.

The automatic operation suits installation contexts where technical staff may not be audio specialists. ICS needs no tuning, no calibration, no ongoing adjustment. It integrates with the spatialization system and runs transparently for the life of the installation. 

Live Sound

Immersive live sound systems — theatre, touring concerts, festival main stages — bring spatial audio to audiences that number in thousands. Array systems with many speakers create spectacular spatial effects, but the comb filtering scales with the spectacle. Speech intelligibility suffers. Musical clarity degrades. The very technology intended to enhance the experience undermines it.

ICS restores the natural sound. Dialogue remains intelligible regardless of positioning. Music maintains its full tonal character throughout the venue. Moving sources — actors tracking across a stage, musicians circulating through the audience — sound consistent rather than shifting in timbre as their position-dependent comb patterns sweep through.

For sound designers, ICS enables creative choices that comb filtering would otherwise foreclose. A source can position at exactly the dramatic location required, not at a compromise position chosen to minimize artifacts. Sound effects can include the full frequency range, not filtered to avoid problematic interactions. The spatial design serves the show, not the acoustics.

The real-time operation handles the dynamic nature of live performance. Sources don't follow predetermined paths — performers move freely, designers make real-time adjustments, automation follows complex cue sequences. ICS adapts to whatever happens, maintaining consistent correction throughout. 

Immersive Audio Production

Studios mixing for immersive formats — Dolby Atmos, Sony 360 Reality Audio, Auro-3D — face a fundamental challenge: the mix is authored on one speaker system but will play on countless different systems with different speaker counts and positions. The comb filtering that exists on the mix room's speaker array differs from the comb filtering on every playback system.

ICS addresses the production side of this challenge by ensuring the mix room itself doesn't impose comb artifacts on the creative process. Engineers hear sources as they should sound, positioned as they should position, without the timbral damage that would otherwise color their mixing decisions. The spatial choices they make are clean choices, not compensations for their monitoring system's interference patterns.

For object-based mixing, ICS's source-by-source processing matches the production paradigm. Each object receives correction appropriate to its current position. As objects move through automation, ICS tracks and corrects continuously. The dynamic nature of object-based audio demands dynamic correction; ICS provides it.

When mixing to channel-based formats where the final speaker configuration is known, ICS can optimize correction for the specific delivery format. A 7.1.4 Atmos deliverable gets correction matched to 7.1.4 speaker geometry. The result translates cleanly to consumer systems that follow the same geometry.

Object-Based Audio

Object-based audio formats represent sound as positioned sources rather than pre-rendered channel feeds. A renderer converts object positions to speaker feeds at playback time, adapting to whatever speaker configuration exists. This flexibility is the format's strength — but it also means comb filtering conditions change with every playback system.

ICS integrates at the renderer level, applying correction matched to the actual playback speaker configuration. The object data includes position; the renderer knows speaker positions; ICS has everything needed to calculate and apply appropriate correction. The result is clean playback on any compliant speaker system.

For broadcast and streaming platforms delivering object-based audio, ICS at the renderer ensures consistent quality regardless of receiver. A listener with a 5.1 system hears clean spatialization. A listener with a 7.1.4 Atmos system hears clean spatialization. The format's promise of position-based audio translates to actual quality improvements rather than position-based comb filtering.