Adding a matched noise to the opposite ear can lower masking.

Evidence

In his experiment, the same speech signal was presented to the left and right ears. In one condition, the speech signal was homophasic (identical at the two ears) and in the other the speech signal was inverted at one of the ears (antiphasic). A homophasic noise stimulus was presented simultaneously with the speech in both of the conditions. — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 1550 (#corroborates, via linked claim)

Categorization

• XREF: connects to: Loud maskers can paradoxically improve audibility at condensation peaks.; Inverting signal phase at one ear vastly releases speech from masking. — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 1550

Broader Connections

• Inverting signal phase at one ear vastly releases speech from masking. #corroborates (0.85) — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 1550