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Here is the reading material:
https://www.gearslutz.com/board/studio-building-acoustics/1189431-multiple-subs-alternative-bass-trapping.html
https://www.gearslutz.com/board/studio-building-acoustics/1118704-add-sub-instead-even-more-bass-trapping-even-out-freq-response.html#post12207821
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