But, if the loudspeaker design intends the floor to be part of the speaker (similar to a more complex multi-cavity enclosure), then raising the subwoofer will defeat the original design intent
Anyway, I have been sending out 'feelers' to find a vintage ACOUSTICAL MFG, Ltd (later "QUAD") 50's full-range corner ribbon speaker in good, working condition. Exquisite design and cabinet. Virtually extinct.