Audio Mono to Stereo Spatial Width Expander

The Haas Effect (precedence effect) states that when identical sounds arrive at human ears with a micro-delay of 10 to 35 milliseconds, the brain perceives the sound as a wide, single acoustic event in 3D space rather than two distinct echoes.

Mono recordings sound narrow and clustered in the center of headphones. Stereo widening creates depth, separation, and room ambience that enhances instruments and background vocals.

Yes, keeping delay times below 25 milliseconds maintains good phase coherence if the track is summed back to mono.