Allpassphase ((better)) Direct

This is the most common use case. Imagine you have a kick drum and a bass guitar playing the same note. Even if they are perfectly in time on the grid, the waveforms might be out of phase. This causes the low end to cancel out, making your mix sound thin and weak.

Consider a transient sound—a sharp click or a snare drum hit. This transient is composed of a wide spectrum of frequencies. If an allpass filter shifts the phase of the high frequencies relative to the low frequencies, those frequency components no longer align perfectly in time. The result? The peak amplitude of the transient is reduced, the waveform becomes asymmetrical, and the "punch" is softened—even though the frequency spectrum (the EQ) looks identical. allpassphase

Magnitude response: [ |H(j\omega)| = 1 \quad \textfor all \omega ] This is the most common use case