Colocated speech thresholds are unaffected by audibility-driven amplification, unlike separated ones.

Evidence

Thresholds for the colocated conditions (Fig. 2 left panel) were basically independent of amplification level … It appears that under these conditions, a large proportion of the SRM deficit in the HI (and simulated HI) group could be attributed to reduced audibility. — Dijk, Pim van, Physiology, Psychoacoustics and…, 1740