6th order ? for 80inches or anyone else good with 6th order

[V8SRSLO]

Room isnt an issue im just looking for the best output from 2 DC xl18m2's. they currently reside in a regular ported box. 11.34^3 net volume, tuned to 36hz. The in cab peak is 43hz sealed, offical TL 150.2db on a clamped 2700 watts. I would like to get more out of them so I wanted to try my luck with a 6th order box to see if my score wont bump up a little. Would the box dimensions be different between parallel or series tuned? Does parallel have higher gain? how do you decide what to tune each chamber to? Whats a good ratio for the chambers?

Thanks

Richard Harris

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