База знаний по hi-fi и high-end технике и комплектующим, отзывы и впечатления
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Бас в бесконечном экране
https://www.subwoofer-builder.com/ib.htm
IB is usually used for bass. It allows for the air space «behind» the woofer to act as the enclosure. The rule of thumb for the amount of space is 10X VAS of the woofer.
OB are often/usually run full range, and therefor the rear wave off the driver is used, after it reflects off the room and furnishings etc.