| 摘要 |
A compact hybrid pipe organ, wherein certain bass notes are electronically produced, and wherein the remaining notes utilize a compact and portable swell box to produce the characteristics pipe organ tones, is disclosed. The swell box is just large enough to encompass a selected number of ranks of organ pipes, the pipes being oriented to have their opening facing toward an open side of the swell box so that the tones are directed outwardly away from the back surface of the box. The open front of the box is selectively closable by means of a plurality of pivotally mounted shutters which rotate under the control of the organist. At least the rear wall of the swell box is covered with a sound-absorbent material to prevent rearwardly-directed sound waves from being reflected in a forward direction, and thus, to prevent the production of standing waves within the swell box. The shutters may be of a non-sound-absorbent material, and thus may be of wood, or in a preferred form, may be glass plates. The shutters need not overlap, since a tight seal of the box is not required, but may pivot into an edge-to-edge alignment across the front of the box in the closed condition, leaving sufficient space between the adjacent shutters for ease of operation, without adversely affecting the musical performance of the swell box.
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