| 摘要 |
A loudspeaker unit comprises, in combination, a pistonic loudspeaker and a resonant panel loudspeaker arranged such that the resonant panel is movable, for example by rotation, with respect to the pistonic loudspeaker. The resonant panel may be movable with respect to the pistonic loudspeaker between a first position in which the resonant panel covers the pistonic loudspeaker, and a second position in which pistonic loudspeaker is uncovered from the resonant panel. The resonant panel may be movable by means of a motor, for example by remote control. A loudspeaker assembly comprising a resonant panel loudspeaker, a support to which the resonant panel is attached, and a motor by which the resonant panel is movable with respect to the support, is also disclosed. The assembly may form part of the unit. The assembly or unit may be attached to a wall or other boundary, for example in a recess.
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