[ S'(n) = g_S(f) \cdot D\bigl(S[n]\bigr), ]

with β controlling drive (0 ≤ β ≤ 5) and γ the blend factor (0 ≤ γ ≤ 1). The high‑shelf has a cutoff at 4 kHz and a gain of up to +6 dB. Let L[n] and R[n] denote left/right channels. The Mid (M) and Side (S) components are

Statistical analysis (ANOVA, p < 0.01) confirms that DFX‑AE (default) yields a significant improvement over the original and the competitor across all categories.

[ G_\mathrmLU = 10^(L_\mathrmtarget - L_\mathrmint)/20. ]