Often, well‐designed arrays of electroacoustic transducer elements radiating into water exhibit erratic behavior in the transmission‐frequency band such that the distribution of magnitude and phase of element velocities across the array appears to be independent of the distribution of electrical driving voltages or currents. Even at low drive levels, directivity patterns and source levels deteriorate, and some elements may even experience structural failure because of excessive motion of the radiating face. The cause of this unsatisfactory behavior is diagnosed and relatively simple curative measures are presented. In particular, the cure requires a separate tuning reactor for each element. The reactors are identical, but must be selected by a new criterion. If modular drive is used, the drivers must have a very low or a very high internal impedance, depending on circumstances.