Time alignment took the most effort, then tweaking the response with some custom filters to get a perfect house curve from 18 ->80Hz took it to the next level.
Response before (negative summation, destructive interference: https://i.imgur.com/qNLKWxU.png
This is the response afterwards across all 3 subs with no smoothing , just DSP applied and basic delays for time alignment to achieve constructive interference: https://i.imgur.com/3FgYIWM.png
Legacy speakers for all 7 bed channels (Focus SE, Marquis HD, Silhouette Pro & Phantom HD), and KEF CI200RR atmos overheads. Subs are Seaton Sound SubMersive (2x HP+ and 1x F2+)
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