How to lower the internal volume of an already finished eclosure

the story in brief: I have a pair of speakers that I call "Satori Frankestein" with SB satori MW16p-8 + SB satori TW29R, the cabinet is that of Jeff Bagby's Kairos but I'm testing the crossover of Joachim G's Kalasan 5. Having difficulty to obtain a smooth low end, I want to experiment with a lower volume of the cabinet, however since it does not have openable sides and that the internal surfaces are covered with felt, the operation is not so simple and reversible, I thought I would try it by inserting some volumes of polystyrene between the sides of the cabinet (equivalent to about 3 liters) but I wonder if the polystyrene is dense enough for this purpose and also if fixing it only by interlock could have a bad influence on the result
 
Foam board. Doesn't compress, light as can be, doesn't resonate much if any, and easy to shape.

cone mount.jpg
 
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Loizek my kairos cabinet went a little big (17 Lt) but the problem is that I am not able to get a good low end, in nearfield measurement I have a bump on 60hz and a dip from 70 to 120 hz, if I stuff the port things are a little better but the low end becomes too weak, the idea of trying with less volume comes from the fact that the cabinet of the kalasan is significantly smaller, also i read on Amplabs the comment of the designer of the trush-CAT (Satori mw16p-4): he faced a similar problem by reducing the volume of the speaker from 18L to 13L
 
the large bump at 60 hz is 3,5 db the dip from 70 to 180 hz average 1,5 db, the result is a boominess in the low end plus the weakness of the midbass, I have an extendable port so from the initial 13 cm I have sperimented everything from 16 to 9 cm but the problem is there... this measurement was taken without the port
 

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