The threshold of the acoustic reflex (TAR) and the magnitude of middle‐ear muscle response were measured for a homophasic (0°) and an antiphasic (180°) 550‐Hz tone in a background of in‐phase noise. Signal‐to‐noise ratio ranged from −20 dB to +15 dB. Whereas previously reported data shows an effect of phase on the percept of loudness, no evidence of a phase effect was measured for acoustic‐reflex responses. These results are interpreted as evidence against a relation between loudness and acoustic reflex for binaurally presented signals.