(at that time, tube equipment) could be placed inside and cooled by convection in the open enclosure.

Most of the enclosure types discussed in this article were invented either to wall off the out-of-phase sound from one side of the driver or to modify it so that it could be used to enhance the sound produced from the other side.

Background

In some respects, the ideal mounting for a low-frequency loudspeaker driver would be a rigid flat panel of infinite size with infinite space behind it. This would entirely prevent

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