Hi there,
i tried for a while e nearfield listening setup at my desk with 4 15 inch woofer as subs and a small OB with a custom sonido 8 inch with no whizzer cone and a Visaton B80 as FR and tried out all sort of diffrent crossover frequencies between the 8 inch and the 3.5 inch FR, here an old picture

it was a little bit crazy but the all over performance for a desktop setup was really good
as always this is only my personal opinion, Stefano
i tried for a while e nearfield listening setup at my desk with 4 15 inch woofer as subs and a small OB with a custom sonido 8 inch with no whizzer cone and a Visaton B80 as FR and tried out all sort of diffrent crossover frequencies between the 8 inch and the 3.5 inch FR, here an old picture

it was a little bit crazy but the all over performance for a desktop setup was really good
as always this is only my personal opinion, Stefano