Ditto coke while reading this:
"In the early days of hi-fi, manufacturers were not fully aware of the relationship between the drive unit and the acoustic role played by the cabinet itself, and they sometimes left the rear of the cabinet open. Mr. Villchur realized that if the cabinet were completely sealed, the air trapped inside would act something like a spring that would control the cone’s vibrations, greatly enhancing the drive unit’s low-frequency performance."
GM
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