By gentile slope what do you mean? Are you saying like 12 db at 50 ish in order to play down to 30ish
EDIT: Again I am assuming here a sub is being used. If there's nothing below the Speaker we're crossing over the gentle slope concept isn't really a concept at all.
I think, if a sub is being used, good low performance of the midbass can be used with a gentle slope to get good blending properties without the lows polluting the 500-1000 range where this driver should really shine.