[Kat Manton]

Hi,

Less opinion but more mathematics - the cabinet volume will have been calculated based on the characteristics of the original drive unit used.

Armed with the Thiele-Small parameters for the drivers under consideration and the volume of the cabinet you could calculate frequency response curves for these drivers in that cabinet, then decide which, if any, will work. It should be possible to do this with spreadsheet software, though I've never tried it; I used to use a rather old bit of DOS software for designing speaker systems but haven't done this in a long time.

There should be some stuff on the 'net concerning speaker design; you basically need to do pretty much the same things as a speaker designer calculating a cabinet volume to match a specific driver. The difference is that you're starting with a fixed cabinet volume then selecting a driver which matches the cabinet.

Regards, Kat