Martin go to the Lowther America web site --then to links---one site is a lenghty story of builing Medellions and then building your BR design----and he reports of better low end than the Lowther design---but your comment as which driver is valid---a driver with more extension has better low Hz values but does so at the expense of the top end-and thsi is so for a driver that performs well on hi end will not have that low end punch---I'll reprot back as to which Lowthers I get and how I apply them Jim