2 Ways with Rear forward firing 12 inch Drivers.

I'm redesigning my system starting with speakers. I have just purchased a set of black Rogers LS5/9 stand mount speakers which will be on 600mm custom stands. I know having these on high stands will effect the lower frequency. I'm thinking they will roll off around 80Hz. The plan is to build two passive enclosures running a set of classic AD12100W8 12 inch Philips drivers per box, one each channel that will be placed horizontal behind the Rogers against the wall that will cross from around 120Hz but run the Rogers at their full frequency response. I want to achieve these to go down to around 30Hz. The room has terrible bass response reason why I want to go this way.

Has anyone gone in this root?
 
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