Hydraulic antivibration support active comprising two armatures (2, 3) connected together by an elastomer body (5) which partly delimits a work chamber (a) filled with liquid, the working chamber communicating with a narrow passage (c) with a compensation chamber (b) separated from said working chamber by a rigid wall (10). The rigid partition is pierced with a first nozzle (e) is closed by a movable exciter member (17), and a second nozzle (45) closed by a valve (32) whose movements are limited in order to correspond to an amplitude of variation of volume of the working chamber, which is less than 20% of the amplitude of the variations in volume generated by the exciter member.
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