Howdy yall I normally hang in the full ranger forum , but i happened to see yalls forum somewhere. SOME fostex work in a BR the Fe-167,207 have a high enough Qts that with little or no series resistance to up the Qes which in turn up the Qts they can be used. Omega is a good example.There is even examples of BR on the lower Qts drivers (Fe166e,206e,168e sigma ect ect) but they are not recomended. Just go to the madison sound fostex page and at the bottom of every page of horn design there will be an example of a BR type cab. ron